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T703 BOOK - JagRepair.com - Jaguar Repair Information Resource

1. FLAP ACTUATOR CIRCUIT 4 gt rN Ne MOTOR DRIVE B V PD MOTOR DRIVEB V gt SENSOR FEEDBACKV 4 Pil N SENSOR SUPPLY lt 5 V gt REFERENCE GROUND gt 703 130 703 132 NOTES 3 4 18 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM Dual Coolant Control Valve DUAL COOLANT CONTROL VALVE The dual coolant control valve located behind the right hand headlamp contains two solenoid operated valves that are actuated by the A CCM to achieve the driver and passenger selected temperatures The A CCM using pulse width modulated PWM low ground side drives positions the valves to control engine coolant flow through the partitioned dual zone driver passen ger heater core Battery voltage 12 v minimum is required to close the valves so that if electrical circuit failure occurs the valves will remain open and allow full coolant flow to the heater core Control of the two valves of the dual coolant control valve is phased 180 apart to reduce the risk of water hammer being generated in the supply of coolant to the 703 133 valve and to reduce the chance of the valves internal mechanical movement being he
2. T703 118 NOTES 3 4 10 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM System Details HEATER EVAPORATOR AND BLOWER UNIT Blower Control The single high output variable speed blower is driven by a Blower Motor Controller located within the blow er housing The controller has an integral high speed relay The driver has the option of manually selecting one of seven preset blower speeds from the control panel or selecting AUTO to allow the A CCM to deter mine the appropriate blower speed In automatic mode blower speed is determined as a function of many input variables Based on the selected in vehicle temperature the A CCM calculates the blow er speed from input signals received from system sensors These include Ambient temperature T703 119 Discharge air temperatures Driver and Passenger In car temperature LH and RH solar loads BLOWER MOTOR CONTROL The A CCM controls the blower motor controller with a pulse width modulated signal Blower speed is repre sented by the bar graph on the panel display One bar is the minimum speed seven bars is the maximum blow er speed There are two vehicle conditions that alter normal blower speed control in automatic mode 1 Cold ambient temperature cold engine coolant temperature cold in car temperature lf
3. An orifice tube system is similar to an expansion valve system However since the orifice tube is a fixed size the tube must flood the evaporator to work properly under all conditions As the refrigerant passes through the evaporator most of it changes into gas and then travels to the accumulator The accumulator replaces the receiver drier in the system The accumulator drier separates the liquid refrigerant from the refrigerant gas and also removes moisture and contaminants This pre vents liquid refrigerant from getting back into the compressor and allows higher heat loads by keeping the remaining liquid on hand 4 ACCUMULATOR DRIER EVAPORATOR ORIFICE TUBE T703 37 NOTES 1 6 6 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Components 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ke CLIMATE CONTROL JAGUAR Service Training HEATING SYSTEM HEATING SYSTEM COMPONENTS S TYPE V6 SHOWN INTERNAL BYPASS COOLANT DUAL
4. ASSEMBLY 7703 23 COMPRESSOR OPERATION PISTON TYPE DISCHARGE VALVE DISCHARGE VALVE SUCTION SUCTION VALVE VALVE T703 24 Date of Issue 07 01 2002 Student Guide 1 4 3 CLIMATE CONTROL KG JAGUAR Service Training REFRIGERATION SYSTEM COMPONENTS CONDENSER 1 HIGH PRESSURE HOT VAPOR 2 HIGH PRESSURE HOT LIQUID 3 HIGH PRESSURE WARM LIQUID T703 25 Condenser The condenser is located in front of the radiator The condenser receives hot high pressure refrigerant gas from the compressor and transfers the heat to the out side air Like the evaporator the condenser circulates refrigerant through series of tubes and fins fan draws outside air over the condenser s surface area allowing the hot refrigerant to pass its heat to the air As the refrigerant cools it changes from a high pressure gas to a high pressure liquid The efficiency of the con denser is critical to A C operation The outside air must absorb the stored heat from the vehicle interior plus the additional heat that results from compressing the gas The more heat transferred by the condenser the more cooling the evaporator can provide larger capacity condenser and more efficient fan will reduce the inte rior temperature significantly NOTES 1 4 4 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training CLIMATE CONTROL Receiver Drier RECEIVER DRIER
5. AMBIENT TEMPERATURE SENSOR SOLAR SENSOR COMBINED A C CONTROL PANEL W LCD AND CONTROL MODULE IN CAR TEMPERATURE SENSOR 7703 40 Date of Issue 07 01 2002 Student Guide 1 8 3 Kore CLIMATE CONTROL JAGUAR Service Training 1 8 4 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Component Location 2 8 Control Module 2 9 Climate Control Panel 2 10 Temperature Control Sensors 2 11 Vehicle Systems Interfaces 2 12 Control Panel Diagnostics 2 13 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training OVERVIEW The Jaguar Denso Climate Control System introduced the 1995 Model Year is standard equipment on and XK models The system is controlled through microprocessor based electronic control module and microproces sor based control panel The system produces the driver selected comfort level by controlling air flow volume and distribution using cooling from the air
6. 0 C 32 P ambient temperature The clutch has power supplied from the air conditioning compressor clutch relay This relay is located in the BJB and is labeled R6 on the fuse and relay schematic NOTES 4 4 18 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Pressure Transducer PRESSURE TRANSDUCER This component is located under the right hand inner wheel arch behind the wheel arch liner Because a Schraeder valve is fitted the unit can be changed without depressurizing the refrigeration system The transducer controls two systems Cooling fans Compressor clutch The pressure transducer is hard wired into the ECM by three wires 5vsupply Ground T703 167 Feedback The unit consists of a strain gauge device which outputs a voltage with reference to refrigerant pressure e 0 5v 0 35 bar 507 psi At 30 bar 435 psi pressure the ECM will cut off the compressor clutch it will reengage at 16 bar 232 psi The reengagement pressure is chosen for compressor clutch torque protection The average time between 30 bar 435 psi and 16 bar 232 psi using a fixed orifice tube is approximately 7 seconds The signal from the pressure transducer is redirected by the ECM to the A CCM to be used in the compressor clutch and cooling fan control strategy NOTES Date of Issue 07 01 2002 Student Guide 4 4 19 x J
7. JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM In Car Air Temperature Sensor IN CAR AIR TEMPERATURE SENSOR LHD SHOWN The in car air temperature sensor located in the duct on the fascia is a thermistor which has a negative tem perature coefficient NTC A venturi connected to the VENTURI plenum chamber causes interior air flow through the duct and over the sensor In car air temperature is P d determined by the A CCM by the change in the sensor resistance The A CCM applies a fixed voltage 5 v to the sensor and monitors the voltage across the pins to detect the varying resistance BLOWER AIR FLOW The A CCM uses the in car temperature calculation for system control configuration to compensate for in car temperature If the A CCM loses the in car temperature signal default value of 24 C 75 F is substituted T703 126 NOTES Date of Issue 07 01 2002 Student Guide 3 4 15 S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM System Details continued EVAPORATOR DISCHARGE AIR TEMPERATURE SENSOR 7703 127 ae JAGUAR Service Training Evaporator Discharge Air Temperature Sensor The DATC does not use direct contact evaporator temperature sensor Instead the sensor measures the evaporator discharge air temperature The evaporator discharge air temperature sensor located in the left hand side of the central evaporator heater core matrix
8. Date of Issue 07 01 2002 Student Guide 2 2 9 ae XJ CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM Compressor Clutch Control The compressor is switched on or off depending on the evaporator temperature and the operating demands of the climate control system and the engine When the climate control system is switched on the A CCM requests that the engine control module ECM switch on the compressor clutch If engine operating parameters are within an acceptable range the ECM applies a ground to the compressor clutch relay coil to switch on the compressor The ECM inhibits compressor operation under the following conditions Engine coolant temperatures above 119 C 246 F At idle speed the compressor is momentarily inhibited 50 ms to allow the ECM to increase the idle speed to compensate for the compressor load At high engine load WOT the compressor is inhibited If the compressor clutch is engaged and one of the above conditions occurs the ECM disengages the clutch until the inhibiting condition is corrected Compressor Clutch Diagnostic Monitoring The A CCM uses the B compressor on input to monitor the integrity of the compressor clutch drive circuit If all compressor operating conditions are met and a request signal has been sent to the ECM the A CCM should receive the B signal If the B signal is not received a fault condition is assumed
9. Temperature Default Sensor Name Voltage Range COM Temperature Wiring Data Page Student Guide Demonstrates Competence Instructor Signature Date Date of Issue 07 01 2002 Student Guide 2 12 3 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 12 4 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 3 1 Overview 3 2 Refrigeration System 3 3 Heating Cooling System 3 4 System 3 5 Windshield Backlight and Rear View Mirror Heaters 3 6 Task Sheets 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM OVERVIEW The Jaguar S TYPE uses Visteon made climate control system introduced the 2000 model year microproces sor based electronic control module and microprocessor control panel control the system This system has one unique feature which is the Dual Automatic Temperature Control system in which both driver and front passenger have independent control of the air temperature for their individual comfort NOTES 3 1 2 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL
10. Climate Control System ON OFF CLIMATE CONTROL PANEL ON OFF FUNCTIONS SYSTEM ON AND AUTOMATIC MANUAL OPERATION SYSTEM ON AND AIR CONDITIONING ON OFF SYSTEM ON DEFROST ONLY AND DEFROST SELECT SYSTEM ON OFF AND MANUAL FAN SPEED T703 100 The climate control panel is switched ON by pressing one of the following panel controls AUTO AUTO switches the system ON in the automatic mode AUTO appears on the panel display Temperature blower speed and air distribution are automatically controlled If heat is required the blowers will not operate until the engine temperature has risen above 30 C 87 F unless defrost is selected The blowers operate any time cooling is required Except in recirculation mode blower speed is linked to vehicle speed to adjust for the ram air effect at higher vehicle speeds A C A C switches the system ON in air conditioning mode only The system uses the air condi tion settings in effect the last time air conditioning was used DEF DEF switches the system ON in the defrost mode only Air is directed to the windshield only The blowers operate at maximum speed Temperature is automatically controlled by the A CCM Push OFF Push OFF switches the system ON in the AUTO mode AUTO appears on the panel display The climate control system is switched OFF as follows Push OFF Push OFF is the only method for switching the system OFF When push OFF is pressed the system i
11. bypass 90 by sensing suction pres sure At low air conditioning load the suction pressure is low and the bypass valve is moved toward open at high air conditioning load the suction pressure is high and the bypass valve is moved toward closed To pro tect the compressor from extreme high pressure damage a pressure relief valve is incorporated in the compressor manifold The relief valve opens only long enough to release sufficient refrigerant to bring the pressure down to a safe level In addition the compres sor incorporates a thermal switch in the clutch drive circuit that trips to disengage the clutch and protect the compressor if extreme high compressor body tempera ture occurs The thermal switch will reset automatically The graphs show the improvements in volumetric efficien cy and cooling capacity over other types of compressors NUM VOLUMETRIC EFFICIENCY COMPARISON COOLING CAPACITY COMPARISON 5 gt SCROLL 2 9 5 Fi t SCROLL e o z 4 8 2 i ES gt I ND SS Aene N See N PISTON SPEED SPEED VOLUMETRIC EFFICIENCY COOLING CAPACITY 703 108 703 109 Date of Issue 07 01 2002 Student Guide 3 2 3 ae S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training REFRIGERATION SYSTEM Compressor Clutch Control The A CCM broadcasts a SCP compressor ON request message to maintain optimum evaporator tempe
12. 4 Student Guide Date of Issue 07 01 2002
13. CLIMATE CONTROL SYSTEM Compressor To raise the pressure of the R134a refrigerant gas a 90 cc scroll type variable capacity compressor is employed This compressor is a carry over unit from the S TYPE system The compressor is controlled by the engine manage ment system EMS it is mounted to the lower RHS of the engine bay and rigidly mounted to the engine The unit has a variable capacity via an internal valve which can bypass volume through the compressor when required The compressor output varies from 100 to 30 depending on refrigerant demand the variation is governed by the internal valve within the compressor housing The compressor clutch air gap is adjustable The compressor has protection in the form of a pres sure relief valve and a sensing element for over temperature conditions The compressor oil fill quantity is 220 cc however the system quantity is 290 cc Condenser The 16 mm multipass condenser is used to change the state of the refrigerant from gas to liquid and it is mount ed in front of the radiator cooling pack module A multipass condenser was chosen because it has a much higher performance capacity than a single pass unit Two top slots locate the upper part of the condenser while the lower part is secured by two fixings Removal of the condenser is from below the front of the vehicle once the two fixings and connection hoses have been removed JAGUAR Service Training
14. 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae JAGUAR Service Training CLIMATE CONTROL AIR VENTILATION SYSTEM Vehicle Ventilation System Airflow The ventilation system provides fresh air into the interior of the vehicle Air entering a point at the front of a vehicle is allowed to flow through the interior of the vehicle and exits at vents or openings in the door jambs or exit points to the outside air The ventilation system has some form of control to allow air to flow or not flow through vehicle depending on the setting of the air distribution system The ventilation system uses the HVAC system to provide ven tilated air to the interior of the vehicle Some vehicles use an air filter to remove dust and pollen from the inlet air side of the ventilation system VEHICLE VENTILATION SYSTEM AIRFLOW T703 39 NOTES 1 8 2 Student Guide Date of Issue 07 01 2002 CLIMATE CONTROL JAGUAR Service Training The electrical control system provides the operator control of blower motor speeds discharge air temperature air flow distribution and HVAC system controls and protection devices REMOTE A C CONTROL MODULE VENTILATION SYSTEM COMPONENTS TELEMATICS DISPLAY MODULE OPTIONAL INSTALLATION
15. AMBIENT AIR IN T703 84 FACE SELECTED Dee gt ee COOL WARM AIR OUT BLEND AIR AMBIENT AIR IN 7703 85 Date of Issue 07 01 2002 Student Guide 2 5 7 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING HEATER UNIT Air Distribution continued FACE FEET SELECTED BI LEVEL MINIMUM TEMPERATURE DIFFERENTIAL THROUGH 1997 MY ONLY psp COOL WARM AIR OUT BLEND AIR gt pos AMBIENT AIR IN 703 86 COOL WARM AIR OUT BLEND AIR y VY AMBIENT AIR IN 7703 87 2 5 8 Student Guide Date of Issue 07 01 2002 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training FEET SELECTED EE COOL WARM AIR OUT BLEND AIR D AMBIENT AIR IN T703 88 DEMIST SELECTED COOL WARM AIR OUT p gt BLEND AIR o AMBIENT AIR IN T703 89 Date of Issue 07 01 2002 Student Guide 2 5 9 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING HEATER UNIT Servos and Feedback Potentiometers Six air flow control flap servo assemblies are used in SERVO ASSEMBLY the system Defrost vent Cool air bypass Center vent Footwell vent left fresh recirc flap blower intake Right fresh recirc flap blower intake Each servo incorporates a feedback potentiometer that provides the A CCM with a feed
16. Kore CLIMATE CONTROL JAGUAR Service Training 1 6 2 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training CLIMATE CONTROL REFRIGERATION CYCLES Refrigeration Cycle in an Expansion Valve System REFRIGERATION CYCLE HEAT TO ATMOSPHERE RECEIVER CONDENSER DRIER a COMPRESSOR WS EXPANSION VALVE EVAPORATOR HEAT FROM VEHICLE INTERIOR 7703 32 Vehicle A C systems use the physical principles of heat transfer and movement Vehicle A C systems either fice tube or expansion valve type systems The A C system is divided into two parts a low pressure side and a high pressure side Refrigerant boils or evaporates in the low side and condenses in the high side As the refrigerant flows through a complete cycle the refrigerant undergoes two changes in pressure and changes of state The A C system can be divided into four sections The horizontal line in the graphic divides the cycle into a high pressure side on top and a low pressure side on the bottom The high pressure side starts at the compres sor outlet extends through the condenser and receiver drier and ends at the expansion valve When refrigerant leaves the expansion valve
17. SCROLL TYPE COMPRESSOR x T703 141 CONDENSER ASSEMBLY T703 142 Automatic transmission models will require that the transmission fluid cooler be moved to one side to allow the condenser to drop down NOTES Date of Issue 07 01 2002 Student Guide 4 2 3 ae JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM REFRIGERATION SYSTEM Fixed Orifice Tube The unit is located inside the evaporator inlet pipe and mounted towards the right hand side of the engine bay bulk head as viewed from the driver s seat position The unit is color coded to identify the flow rate the X TYPE uses an orange color coded unit for this climate control system The fixed orifice tube is a simplified device which replaces the thermostatic expansion valve FIXED ORIFICE TUBE LOCATION 703 142 For vehicles in service a special tool is required for the removal and installation of the fixed orifice tube to the evap orator inlet pipe For installation purposes there is an arrow to show the direction of refrigerant flow This indication is important to the operation of the system as the device has different filter elements the long filter is used for debris collection However the second shorter filter of the two is used to atomize the refrigerant as it enters the evaporator The special tool 412 034 ensures the correct installation of the uni
18. X in the space next to the correct answer This isan open book test andall paper and electronic resources are allowed 1 Concerning a 2000 XK8 Technician A states that the climate control panel can be used to access all the climate control related DTCs Technician B states that the climate control module controls the heater matrix temperature by monitoring the heater matrix temperature sensor and controlling the speed of the heater pump Who is correct A Technician A only B Technician B only C Technician A and B are both correct D Neither technician A or B 2 Concerning a a 2001 8 Technician A states that the ECM activates the compressor clutch relay ON Technician B states that the compressor will operate if the evaporator sensor has an open circuit fault Who is correct A Technician A only B Technician B only O Neither technician A or B D Technician A and B are both correct 3 Concerning an 8 Technician A states that the four way refrigerant pressure switch signals are used to control cooling fan speed Technician B states that the four way pressure switch signals are used to inhibit compressor clutch activation for high and low pressure conditions on an XK8 Who is correct A Technician A only B Technician B only C Neither technician A or B D Technician A and B are both correct 4 The water valve duty cycle on a 2000 XJ8 is 10596 This reading indicates A The water valve is not allo
19. Evaporator matrix Filter elements particle or combination Ducting Fixed orifice tube Display control panels Remote climate control module navigation sys tem only Stepper Motors Face floor Temperature blend Defrost Recirculation Fresh recirculation DC motor for recirculation flap control NOTES 4 5 2 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Service Care Information Failure of any refrigeration component will require that the fixed orifice tube be removed for cleaning or replacement If the refrigeration system is left open for any length of time or if a major component failure where debris is circulat ed around the system occurs the suction accumulator should be changed Specifications The PAG oil specification for the X TYPE refrigeration system is the same as for the S TYPE refrigeration system but not the same specification as the Denso PAG oil therefore only the correct specified oil should be used Refrigerant R134a R134a quantity 0 810 kg Lubricating oil PAG System oil quantity 290 cc PAG oil part number XR8 3680 Decoupler tool 310 D005 Fixed orifice tube remove install tool 412 034 Fixed orifice broken tube extractor tool 412 035 System diagnosis WDS It may not be necessary to use these tools since it is possible to remove the tubes with a pair of pointed nose pliers NOT
20. SERVICE TRAINING COURSE 703 JAGUAR CLIMATE CONTROL SYSTEMS ISSUE ONE DATE OF ISSUE 07 01 2002 This publication is intended for instructional purposes only Always refer to the appropriate Jaguar Service publication for specific details and procedures All rights reserved All material contained herein is based on the latest information available at the time of publication The right is reserved to make changes at any time without notice JAGUAR Publication T703 02 DATE OF ISSUE 07 01 2002 2002 Jaguar Cars PRINTED IN USA KG JAGUAR CLIMATE CONTROL SYSTEMS JAGUAR Service Training INTRODUCTION Jaguar Climate Control Systems provide vehicle occupants with year round automatic temperature and humidity control as selected on the control panel The vehicle heating and air conditioning systems are the foundation for providing the warm cool or combined warm cool air necessary to meet the desired conditions Using advanced electronic components and a microprocessor based control module the Climate Control Systems produce a contin uously comfortable environment over a wide range of ambient conditions CLIMATE CONTROL SYSTEMS INTEGRATION ENGINE CONTROL HEATER COOLANT VALVE MATRIX WARM AIR AS REQUIRED HEATING CLIMATE CONTROL COOLING WARM COOL BLEND A C A C EVAPORATOR SYSTEM CONTROLS MATRIX ooi CLIMAT
21. ae XJ CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM Compressor continued Compressor Drive Belt Adjustment AJV8 engine applications use a multi ribbed serpentine belt with an automatic belt tensioner A belt wear indicator on the tensioner indicates the need for belt replacement Refer to the Service Manual for inspection and belt replacement procedures COMPRESSOR DRIVE T703 170 NOTES 2 2 8 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training Compressor Lubricating Oil The compressor requires a special PAG lubricating oil Refer to the Service Manual and or Technical Bulletins for the correct part number and capacities CAUTION Replacement compressors are supplied filled with the amount of lubricating oil specified for the entire air conditioning system When replacing a compressor completely drain and measure the oil from the existing compressor Then completely drain the oil from the replacement compressor Refill the replacement compressor with an amount of fresh oil equal to that removed from the existing compressor FILLING REPLACEMENT COMPRESSOR EXISTING COMPRESSOR NEW COMPRESSOR AMOUNT OF OIL TO BE USED IN NEW COMPRESSOR OIL DRAINED FROM EXISITING COMPRESSOR AMOUNT OF FRESH OIL TO BE USED IN NEW COMPRESSOR 7703 57
22. is a thermistor which has a negative temperature coef ficient Evaporator discharge air temperature is determined by the A CCM by the change in the sensor resistance The A CCM applies a fixed voltage lt 5 v to the sensor and monitors the voltage across the pins to detect the varying resistance The A CCM uses the evaporator discharge air tempera ture calculation to cycle the air conditioning compressor to maintain the evaporator discharge tem perature at just over 0 C 32 F Actual compressor clutch control is provided by the PCM If the A CCM loses the evaporator discharge air temper ature signal a default value of 4 C 25 F is substituted and air conditioning compressor operation is canceled NOTES 3 4 16 Student Guide Date of Issue 07 01 2002 KG JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM Discharge Air Temperature Sensors The left and right hand discharge air temperature sensors located within the LH and RH air discharge ducts in the central air distribution plenum are thermistors which negative temperature coefficient Discharge air temperature is determined by the A CCM by the change in the sensor resistance The A CCM applies a fixed voltage lt 5v to the sensor and monitors the voltage across the pins to detect the varying resistance The A CCM uses the LH and RH discharge air temperature calculations to determine control of the dual coola
23. CONTROL SWITCHES HEATING AND COOLING TEMPERATURE CONTROL 703 02 NOTES 1 1 2 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training CLIMATE CONTROL The air conditioning A C system and the heating system comprise heating ventilation and air conditioning sys tems The climate control system controls heat temperature air distribution and the removal of humidity The climate control system uses an air distribution system of ducts vents and doors to direct outside air or climate con trolled air into the vehicle passenger compartment AIR DISTRIBUTION T703 03 NOTES Date of Issue 07 01 2002 Student Guide 1 1 3 JAGUAR Service Training CLIMATE CONTROL CLIMATE CONTROL OVERVIEW The climate control system in a vehicle is divided into four closely related subsystems Refrigeration A C system Heating system Air distribution and ventilation system Electrical system AIR CONDITIONING COMPONENTS RECEIVER DRIER 2E Z 20 7 I CONDENSER NS EN REFRIGERANT LINES MW MU Ay z COMPRESSOR T703 04 NOTES Date of Issue 07 01 2002 Student Guide 1 1 4 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Comp
24. Heater Unit 2 6 System Logic 2 7 Control Module 2 8 Climate Control Panel 2 9 Temperature Control Sensors 2 10 Vehicle Systems Interfaces 2 11 Control Panel Diagnostics 2 12 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM ae JAGUAR Service Training TASK SHEET 1 XJ XK TEMPERATURE DEMAND Complete the following exercise using WDS Manual Mode Full Cold Temperature Demand Datalogger Selection Control Panel Selections Potentiometer flap Face Face Foot Foot Defrost Foot Defrost Center vent Cool air Foot Water valve duty cycle Manual Mode Full Hot Temperature Demand Datalogger Selection Control Panel Selections Potentiometer flap Face Face Foot Foot Defrost Foot Defrost Defrost Defrost Center vent Cool air Foot Water valve duty cycle Demonstrates Competence Instructor Signature Date 2 12 2 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training TASK 5 2 XJ XK TEMPERATURE SENSORS Use the Wiring Diagrams and the Student Guide to fill in the table below When the table is complete go to the assigned vehicle and locate the sensors
25. Located near the outlet of the condenser on the high pressure side of the A C system the receiver drier used in conjunction with an expansion valve filters mois ture and foreign matter from the liquid refrigerant and serves as a storage area for refrigerant The receiver dri er may also have electrical controls and service ports for system operation and servicing 6 Ah Accumulator Drier The accumulator is used in A C systems with an orifice tube The accumulator is located after the evaporator and before the compressor on the low pressure side of the A C system The accumulator functions very much like the receiver drier in an expansion valve system NOTE Starting with the 1997 MY XK all Jaguar receiver driers and accumulators contain black die to aid in detecting refrigerant system leaks T703 26 ACCUMULATOR DRIER NOTES FILTER MEDIA REFRIGERANT TUBE T703 27 Date of Issue 07 01 2002 Student Guide 1 4 5 KG CLIMATE CONTROL JAGUAR Service Training REFRIGERATION SYSTEM COMPONENTS EXPANSION VALVE Expansion Valve The expansion valve regulates the flow of refrigerant to the evaporator To get maximum cooling potential the pressure of the liquid refrigerant must be lowered before it enters the evaporator At lower pressure the refrigerant s temperature and boiling point drop allow ing it to absorb more heat as it passes
26. SUCTION TUBE Moisture removal Storage larger volume Filtration system DESSICANT The operation of the suction accumulator is as follows The scroll type compressor draws the refrigerant through the outlet pipe of the accumulator Returning refrigerant from the evaporator is drawn into the suction accumulator via the inlet pipe and flows over a plate inside the accumulator The accumulator volume ensures that the refrigerant is fully vaporized before the gas rises to the top of the assembly and that it is drawn through a tube by the suc tion action of the compressor via the outlet pipe ES At the lower point of the tube is a filter that allows a small amount of oil to enter from the lowest point of the suc tion accumulator and mix with the returning gas for compressor lubrication Moisture is removed from the refrigerant by a sachet of desiccant The accumulator is larger than its expansion valve counterpart to counteract refrigeration overcharging and to pro vide the area for oil separation NOTES Date of Issue 07 01 2002 Student Guide 4 2 7 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training REFRIGERATION SYSTEM Pipes and Hoses Four main hose assemblies connect the refrigeration system together 1 Suction and discharge This assembly connects the compressor to the suction accumulator and the condenser 2 Liquid line This assembly connects the condenser
27. cooling performance will be affected and will result in reduced efficiency of the engine cooling and refrigeration systems RADIATOR AND COOLING FANS 703 148 NOTES 4 3 4 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM Cooling Fans The cooling fans are mounted to the rear of the radiator by two slots and two quick fit connecting clips There no retaining bolt type fixings securing the assembly The assembly consists of two 300 watt motors and fan units housed within a polypropylene cowling To distinguish between the motors each motor is secured to the fan cowling with a different number of spokes The fan motors are controlled via a speed regulator using PWM Control of the motors is via the ECM The signal is used by the speed regulator located in the top LHS of the fan cowling A small air duct passage allows a stream of air to flow over the fins of the regulator to aid cooling The cooling fan speed regulator has an internal temperature sensor that will power the cooling fans at full speed if the temperature threshold rises above a given value The fans only operate if the coolant temperature is 95 C 203 F or above It will cease to operate when the temperature falls below 95 C 203 F thus allowing for hysteresis The cooling fan strategy is controlled by two control modules the ECM and the A
28. 07 01 2002 JAGUAR Service Training XJ XK CLIMATE CONTROL SYSTEM Condenser The condenser is part of the vehicle cooling pack Located in front of the radiator the condenser is the system high side heat exchanger The condenser is constructed as a tube and fin unit similar to the radiator Refrigerant flows through the condenser in separate paths starting at one side and exiting at the other MULTI PATH CONDENSER IN FROM gt COMPRESSOR OUT RECEIVER DRIER 4 T703 169 NOTES Date of Issue 07 01 2002 Student Guide 2 2 3 ae JAGUAR Service Training XJ XK CLIMATE CONTROL SYSTEM AIR CONDITIONING REFRIGERATION SYSTEM Receiver Drier RECEIVER DRIER LOCATION XK RECEIVER DRIER The vertically mounted receiver drier is located near the radiator on the right side of the engine compartment The high side charge port is on top of the receiver drier No sight glass is provided CONDENSER sq REFRIGERANT SWITCH T703 48 NOTES 2 2 4 Student Guide Date of Issue 07 01 2002 XJ
29. 20 0 open closed closed closed fresh OFF closed OFF 21 1 open closed closed closed fresh OFF closed ON 22 10 open closed closed open 1 2 open A C ON closed ON 23 17 bleed 1 2 open closed 1 2 open 1 2 open A C ON 6 sec pulse ON 24 17 bleed 1 2 open closed closed recirc A C ON 6 sec pulse ON 25 23 closed open bleed closed recirc A C ON open ON 26 23 closed 1 2 open 1 2 open closed recirc A C ON open ON 27 31 closed closed open closed open A C ON open ON heater valve operates on a 6 second pulse 3 seconds ON 3 seconds OFF Control Panel Diagnostic Monitoring The A CCM can determine incorrect data by the absence of a minimum number of high and low bits in each data block received or sent The A CCM continuously checks the data flow between the A CCM and the control panel If consistent incorrect data is detected a DTC is flagged EXERCISE Perform the Actuator Check above on the assigned vehicle Record any faults below OBD II DTCs Control Panel Code Date of Issue 07 01 2002 Student Guide 2 11 3 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 11 4 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning
30. 2002 ee XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training Aspirator Motor The motorized aspirator provides a constant flow of interior air over the in car temperature sensor The motor oper ates only when the control panel is switched ON Operation is momentarily stopped when the ignition is turned to position Ill Aspirator Motor Diagnostic Monitoring The A CCM monitors the aspirator motor circuit for open circuit high resistance and short circuit conditions If a fault is present a DTC will be flagged No default value is used for aspirator motor failure The in car temperature sensor will continue to be used by the A CCM but temperature stability will be lost DTCs WDS Control Panel B1853 None B1856 None NOTES Date of Issue 07 01 2002 Student Guide 2 9 3 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training TEMPERATURE CONTROL SENSORS Ambient Temperature Sensor The NTC negative temperature coefficient ambient temperature sensor located on the lower left radiator mount XJ or the right side horn bracket behind the front bumper XK provides the A CCM with a voltage signal represent ing the ambient air temperature The A CCM uses the signal to compensate for ambient air temperature conditions and for the exterior air temperature panel display To prevent an incorrect temperature signal during heat soak conditions stationary vehicle with the engine runni
31. 3 6 Task Sheets 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training TASK SHEET 1 DATC COMPONENT LOCATION Find the following components on the vehicle Write the component number on the appropriate illustration to record its location 1 A CCM control module 5 Dual coolant control valve How many hoses attach to this valve 2 In car temperature sensor 3 Dual solar sensor 4 Auxiliary coolant pump V8 6 Return heater hose 7 High side refrigerant service port What must be removed to access the high side port JAGUAR S TYPE T703 135 INSTRUMENT PANEL HEATER HOSES T703 136 T703 137 Demonstrates Competence Instructor Signature Date 3 6 2 Student Guide Date of Issue 07 01 2002 Kos JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM TASK SHEET 2 CONTROL PANEL FUNCTIONS 1 Indicate the functions performed by each of the panel controls CONTROL PANEL 80 E 703 138 2 List two ways to achieve system balance between the passenger and driver side temperatures 3 What is the maximum temperature differential between the driver and passenger temperature sele
32. 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training TEMPERATURE CONTROL SENSORS The A CCM uses the temperature control sensor inputs to determine the temperature and volume of air required to maintain the selected interior temperature of the passenger compartment In Car Temperature Sensor The NTC negative temperature coefficient in car temperature sensor is part of the aspirator assembly located on the driver s side dash liner The sensor provides the A CCM with a voltage signal representing the average in car air temperature The A CCM uses the signal to correct the outlet air temperature and distribution to reach the target in car temperature selected by the driver ASPIRATOR IN CAR TEMPERATURE SENSOR Approx In Car Temperature Versus Voltage Temperature Voltage F 33 37 92 99 2 00 2 25 2 50 2 75 3 00 3 25 3 50 703 102 In car temperature diagnostic monitoring The A CCM monitors the in car temperature sensing circuit for open circuit high resistance and short circuit condi tions If a fault is present a DTC will be flagged A default value of 25 C 77 F is substituted by the A CCM if an in car temperature sensor fault is present DTCs WDS Control Panel B1250 11 B1253 11 NOTES 2 9 2 Student Guide Date of Issue 07 01
33. In addition the PCM uses the calculation for control of the radiator fan speed and operation The PCM engages the compressor after determining if there is adequate refrigerant pressure as compared to the cal culated displayed ambient temperature DATC ambient temperature SCP message The compressor clutch is disengaged by the PCM if the discharge pressure rises to 29 Bar 420 psi and above Once disen gaged by high pressure the PCM re engages the compressor at 24 1 Bar 350 psi After normal system disengagement the compressor clutch is re engaged by the PCM if the discharge pressure drops to 20 7 Bar 300 psi and below Compressor clutch engagement is momentarily interrupted or delayed by the PCM as follows Momentary disengage during transmission shift automatic 0 2 second engagement delay at idle to allow idle speed response 5 second engagement delay at idle with power steering pressure switch activated NOTES 3 2 4 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 3 1 Overview 3 2 Refrigeration System 3 3 Heating Cooling System 3 4 System 3 5 Windshield Backlight and Rear View Mirror Heaters 3 6 Task Sheets 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 20
34. Issue 07 01 2002 Student Guide 2 10 3 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training VEHICLE SYSTEMS INTERFACES Climate Control Electrical Load When the blowers operate at high speed and or the window and mirror heaters operate additional electrical load is placed on the vehicle charging system When one or more of these components operate the A CCM provides the ECM with B voltage signal The ECM adjusts the engine idle speed to compensate for the increased load The A CCM does not monitor the electrical load circuit for diagnostics Engine Speed The A CCM receives an engine speed signal from the instrument pack The A CCM uses the engine speed signal for the following functions Heater pump control Heater valve control e Windshield backlight and mirror heaters operation Compressor lock sensing through 1997 MY only Diagnostics Engine speed diagnostic monitoring The A CCM compares engine speed to vehicle speed If the engine speed is 0 and the vehicle speed is above 50 mph 81 km h a DTC is flagged No default value is used for engine speed circuit failure DTCs WDS Control Panel P0335 None Engine Cranking During engine cranking the ignition switched ground signal is removed from the A CCM ignition switch position to signal the A CCM to momentarily inhibit the operation of current consuming components The A CCM does not monitor the engine cranking c
35. R20 on the fuse and relay location chart Relay control is via the climate control module with a oid 12v feed to the relay coil windings A blower sense wire is taken from the blower circuit EATC BLOWER MOTOR back to the control module to indicate the blower is operational This signal is used to control the climate control com pressor clutch circuit therefore no blower signal will result in no cooling Blower speed is also used as an aid for compressor clutch control the faster the blower speed the longer the compressor on time In the automatic mode and with heat requested the blower speed will be restricted until 80 C is reached at this point full blowers will then become available arith NOTE Early X TYPE vehicles were fitted with brushless blower motors NOTES Date of Issue 07 01 2002 Student Guide 4 4 17 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training EATC SYSTEM Components continued COMPRESSOR Compressor Clutch The compressor is the same scroll type unit that is used on the S TYPE The compressor clutch is supplied with power from the compressor clutch relay R6 located in the BJB The compressor clutch will not operate if any of the fol lowing events occur High refrigeration pressure blower sensing W O T of 65 100 86 Engine speeds above 5980 rpm Low Idle speeds High coolant temperatures T703 166
36. Remove the four 8 mm bolts 9 Remove the harness connectors from the A CCM control panel assembly 10 Have your Instructor inspect the removed assembly Demonstrates Competence Instructor Signature Date Date of Issue 07 01 2002 Student Guide 3 6 5 ae JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM TASK SHEET 5 S TYPE TEMPERATURE DEMAND Complete the following exercise using WDS Manual Mode Full Cold Temperature Demand Datalogger Selection Control Panel Selections Potentiometer flap Face Face Foot Foot Defrost Foot Defrost Defrost Floor Panel Fresh Recirc Cold Air Bypass Manual Mode Full Hot Temperature Demand Datalogger Selection Control Panel Selections Potentiometer flap Face Face Foot Foot Defrost Foot Defrost Defrost Floor Panel Fresh Recirc Cold Air Bypass Demonstrates Competence Instructor Signature Date 3 6 6 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM TASK SHEET 6 S TYPE TEMPERATURE SENSORS Use the Wiring Diagrams and the Student Guide to fill in the table below When the table is complete go to the assigned vehicle and locate the sensors Temperature Default Sensor Name Voltage Range COM Temperature Wiring Data Page Student Guide Demonstrates C
37. SERVO DRIVE FEEDBACK POTENTIOMETER DEFROST FLAP FLAP POSITION FOOT FLAP SERVO DRIVE FEEDBACK POTENTIOMETER FOOT FLAP aa ELECTRICAL LOAD LOAD INHIBIT COMPRESSOR REQUEST COMPRESSOR CLUTCH CONTROL ENGINE CONTROL MODULE REFRIGERANT PRESSURE SWITCH COMPRESSOR CLUTCH COMPRESSOR ON OFF COMPRESSOR CLUTCH RELAY LOCK SENSOR THROUGH 1997 MY ONLY COMPRESSOR ON A C CONTROL MODULE COMPRESSOR SPEED THROUGH 1997 MY ONLY 7703 94 Date of Issue 07 01 2002 Student Guide 2 6 3 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 6 4 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Control Module 2 8 Climate Control Panel 2 9 Temperature Control Sensors 2 10 Vehicle Systems Interfaces 2 11 Control Panel Diagnostics 2 12 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM CONTROL MODULE AIR CONDITIONING CONTRO
38. and a DTC will be flagged however the A CCM will continue to request the ECM for compressor operation On early 1997 MY XK vehicles the A CCM monitors for compressor lock conditions when the B signal is present No default value is used for this signal DTCs WDS Control Panel B1969 none NOTES 2 2 10 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training AJV8 COMPRESSOR CLUTCH CONTROL XJ XK 1997 MY ON COMPRESSOR SPEED THROUGH 1997 MY COMPRESSOR ON LOCK SENSOR 1997 MY COMPRESSOR CLUTCH CONTROL PANEL M SNTACI BATTERY COMPRESSOR COMPRESSOR ON POWER SUPPLY CLUTCH REQUEST IGNITION POWER SUPPLY COMPRESSOR CLUTCH COMPRESSOR ON ELAY gt 0 32 F COMPRESSOR 2 30 TEMPERATURE EEE SENSOR REFRIGERANT PRESSURE SWITCH RELAY COIL DRIVE GND ELECTRICAL LOAD COMPRESSOR CLUTCH LOAD INHIBIT COMPRESSOR REQUEST A C CONTROL MODULE ENGINE CONTROL MODULE 7703 59 Date of Issue 07 01 2002 Student Guide 2 2 11 XJ XK CLIMATE CONTROL SYSTEM ae JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM DRIVE BELT COMPRESSOR 1703 61 Compressor Lock Sensor Diagnostic Monitoring Compressor Lock Sensor early1997 MY Xk vehicles only Because t
39. conditioning system and heat from the engine cooling system To control cab in temperature the system uses a heater valve to regulate the heater matrix temperature The Denso system differs from previous Jaguar systems that controlled cabin temperature with flaps in the air conditioning heater unit to blend cooled air with the heated air from an unregulated heater matrix The windshield rear window and mirror heater circuits are integral with the Denso climate control system Diagnostic trouble codes DTCs and panel display warn of system faults In the case of most faults default value is substituted for the faulty signal allowing the climate control system to continue to function Both the DTC and the panel display fault code information is supplied in this textbook with the description of each applicable compo nent PLEASE NOTE For aid in understanding the climate control system refer to the applicable Jag uar Electrical Guide for electrical circuit details component information and pin out data NOTES 2 1 2 Student Guide Date of Issue 07 01 2002 Service Training JAG XJ XK CLIMATE CONTROL SYSTEM XJ CLIMATE CONTROL AIR FLOW U XK CLIMATE CONTROL AIR FLOW 2 1 3 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 1 4 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING J
40. disposable refrigerant containers for reuse Remove all refrigerant and dispose of the containers properly Use only containers approved for refrigerant Never fill a container to more than 60 of container capacity Never store refrigerant containers in direct sun or heat High temperature causes the gas to expand which increases the pressure in the container and may cause the container to burst NOTES 1 3 4 Student Guide Date of Issue 07 01 2002 T 8 JAGUAR Service Training CLIMATE CONTROL Refrigerant Fittings R 134A REFRIGERATION FITTINGS Refrigeration fittings allow the system to be checked for proper operating pressures and to empty or fill the sys tem as needed To prevent cross contamination of different types of refrigerants such as R 134a and R 12 refrigeration systems use different styles of fittings There are several differences between R 134a and R 12 refrigeration fittings The most significant difference is that R 134a uses a special coupler that cannot be used on R 12 systems The new fittings on the R134a pre vent excessive loss of refrigerant to the atmosphere HIGH SIDE FITTING LOW SIDE FITTING 7703 20 R 12 REFRIGERATION FITTINGS il a 1 HIGH SIDE FITTING LOW SIDE FITTING 703 21 NOTES Date of Issue 07 01 2002 Student Guide 1 3 5 Kore CLIMATE CONTROL JAGUAR Service Training 1 3 6 Student Guide Date of Issue 07 01 20
41. fixed orifice tube Converted vapor now this lower pressure environment continues to flow through the evaporator matrix taking on the heat from the surrounding air flowing over the matrix fins Heat from the incoming air is absorbed into the liquid causing the liquid to boil The liquid gradually changes its state into a vapor Because the process has used the heat from the surrounding incoming air cold air is left to enter the cabin area for cooling requirements NOTES Date of Issue 07 01 2002 Student Guide 4 2 5 ae JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM REFRIGERATION SYSTEM EVAPORATOR ASSEMBLY Evaporator Assembly The evaporator is mounted within the passenger com partment and is combined with the heater matrix unit into a single housing The housing also contains the blend control flaps The outer RHS panel of the housing is the location where the stepper motor servo actuators are fitted to drive the flaps to the desired positions Removal of the evaporator requires removal of the fas cia however the heater unit can be removed with the housing and fascia left in position Items such as the stepper servo motors which control the panel floor defrost and temperature blend flaps can be accessed via removal of the glove box The functionality of the evaporator remains the same as in previous refrigeration systems that is it uses the incoming air temperature
42. long as the ambient temperature remains at or below 5 C 41 F heated wiper park operates however the voltage threshold for disengagement moves up after the first ten minute period f while heater operating the ambient temperature rises above 5 C 41 F the A CCM will automatically disengage heated wiper park If heated wiper park is disengaged manually automatic engagement is disabled until the next ignition cycle If heated wiper park is manually engaged or disengaged then the ignition switched OFF the selection will be stored in memory for ten minutes in case of restart Heated Backlight and Rear View Mirrors The heated backlight and mirror heaters operate simultaneously and are directly controlled by the rear electronic control module RECM upon receipt of a SCP heaters ON request from the A CCM The heater circuit incorporates a relay located in the rear power distribution box Heated Backlight and Rear View Mirrors Control The A CCM activates the heaters either automatically or manually using the same inputs and control as the heated wiper park NOTES 3 5 2 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 3 1 Overview 3 2 Refrigeration System 3 3 Heating Cooling System 3 4 DATC System 3 5 Windshield Backlight and Rear View Mirror Heaters
43. not switch on the heaters if it receives an engine load signal from the ECM To compensate for the electrical load placed on the vehicle charging system when the heaters operate the ECM acts to maintain the target idle speed CLIMATE CONTROL PANEL SF HEATED REAR WINDOW AND DOOR MIRRORS HEATED WINDSHIELD T703 105 The heated rear window and door mirrors are activated by pressing the R button on the climate control panel The heated windshield can be activated manually by pressing the panel F button When the heaters are requested the A CCM signals the ECM for permission to switch ON the heaters via the electri cal load request hard wire circuit Depending on the engine operating condition the ECM inhibits heater operation by outputting a load inhibit signal to the A CCM via the load inhibit hard wire circuit Engine conditions for heaters ON Engine not at idle Engine coolant temperature below 119 246 F Throttle valve less than full load WOT Engine conditions for heaters inhibited Engine coolant temperature above 119 C 246 F Throttle valve at full load WOT Engine at idle Heaters inhibited for approximately 50 ms as the ECM adjusts the idle speed to compensate for the increased electrical load The heaters are timed as follows Heated rear window 20 1 minutes Heated door mirrors 11 1 minutes Heated windshield 6 1 minutes 2 10 2 Student Guid
44. of Issue 07 01 2002 Student Guide 4 6 5 x JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM 4 6 6 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS AJ16 V12 CLIMATE CONTROL JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 x AJ16 V12 CLIMATE CONTROL JAGUAR Service Training OVERVIEW The climate control systems fitted to 16 and V12 engine XJ XK8 vehicles operate a similar fashion and share most components Important differences between the systems are outlined in this book 2 Student Guide Date of Issue 07 01 2002 AJ16 V12 CLIMATE CONTROL JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM Condenser Refrigerant flow through the condenser differs between the AJ16 and the V12 condensers AJ16 SC COOLING PACK RECEIVER DRIER RADIATOR SUPERCHARGER COOLER CONDENSER 703 44 NOTES Date of Issue 07 01 2002 Student Guide 3 ka AJ16 V12 CLIMATE CONTROL JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM Condenser continued 16 Condenser Single Path Refrigerant flows through the condenser in a single path from top to bottom SINGLE PATH C
45. present use R 134a as an A C refrigerant Unlike R 12 R 134a does not contain CFCs Instead it contains hydrofluorocarbons HFCs which do not damage the ozone layer Like R 12 R 134a has chemical properties that make it ideal for use as a refrigerant These include Low boiling point of 26 15 F at sea level e Ability to change temperature readily in response to changes in pressure R 134a provides most of the benefits of R 12 without the harmful atmospheric effects The absence of chlo rine in R 134a makes it environmentally friendly but R 134a can be flammable at certain pressures and concentrations Refrigerant Mixing A C systems that use one type of refrigerant cannot use the other type For example you cannot use R 134a to charge an older A C system designed to use R 12 Under no circumstances should R 12 and R 134a be mixed in the same system Mixing refrigerants is called cross contamination and it can seriously damage the A C system In addition identifying contaminated refrigerant during normal diagnosis is difficult JAGUAR Service Training R 12 ATOM STRUCTURE 4 FLUORINE ATOM F C Cl CARBON CHLORINE ATOM 1703 16 R 134A ATOM STRUCTURE H F F C C F E HF CARBON ATOM HYDROGEN FLUORINE ATOM 1703 17 R 12 R 134a Container color White Light blue Container m
46. remains energized by the A CCM for 30 seconds after the ignition is switched off to provide bat tery power for the A CCM to park the system servos and also supplies power to the aspirator motor NOTES 2 7 2 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training System Sensors and Potentiometers Power Supply and Signal Ground The climate control system uses multiple sensors to measure and report temperatures on 1997 MY XK only com pressor rotation Feedback potentiometers are used to report the position of air flow flaps and the desired face level differential position through 1997 MY only All of the sensors and potentiometers use a common five volt power supply reference voltage from the A CCM and a common signal ground at the A CCM Sensor and Potentiometer Power Supply and Signal Ground Diagnostic Monitoring The A CCM monitors the sensor 5 volt power supply circuit for open circuit high resistance and short circuit condi tions The signal ground circuit is monitored for open circuit conditions If a fault is present a DTC will be flagged DTCs WDS Control Panel B1297 None B1298 None B1299 None B1863 None NOTES Date of Issue 07 01 2002 Student Guide 2 7 3 XJ XK CLIMATE CONTROL SYSTEM CONTROL MODULE System Diagnostics ae JAGUAR Service Training The A CCM continuously monitors the climate c
47. se AJ16 V12 CLIMATE CONTROL JAGUAR Service Training TEMPERATURE CONTROL SENSORS Ambient Temperature Sensor AMBIENT TEMPERATURE SENSOR The NTC negative temperature coefficient ambient temperature sensor located in the left hand front brake air cooling duct provides the A CCM with a voltage sig nal representing the ambient air temperature 703 103 NOTES Date of Issue 07 01 2002 Student Guide 19 ae AJ16 V12 CLIMATE CONTROL JAGUAR Service Training VEHICLE SYSTEMS INTERFACES Engine Load V12 only The ECM outputs an engine load ground signal to the A CCM if it a detects fluctuation in the idle speed or a high engine load In response the A CCM inhibits operation of blower motor high speed and or window and mirror heaters for a maximum of 15 seconds No heater operation occurs during high engine load The A CCM does not monitor the engine load circuit for diagnostics Engine Speed The A CCM receives an engine speed signal from the ECM The A CCM uses the engine speed signal for the following functions Heater pump control Heater valve control Windshield backlight and mirror heaters operation Compressor lock sensing V12 only Diagnostics NOTES 20 Student Guide Date of Issue 07 01 2002 JAGUAR CLIMATE CONTROL SYSTEMS JAGUAR Service Training STUDENT PROFICIENCY POST TEST Name Date Dealer Score Read each question carefully Place an
48. selection of driver controlled functions and additional automatic functions The DATC climate control system was designed by Visteon for the Jaguar S TYPE Most of the DATC functions and controls are similar to the existing Jaguar systems JAGUAR S TYPE The DATC system has several features that are com pletely new Dual Zone Temperature Control The driver and passenger have independent tempera ture control selection SCP Network The A CCM operates on the SCP Standard Corporate Protocol multiplex network Certain control functions are carried out via SCP 703 114 Voice Control An optional Voice Activation Control system allows the driver to adjust temperature control without touching the DATC controls Heated windshield wiper park All vehicles not equipped with heated windshield are fitted with heated wiper park that operates both automatically and under driver control Other DATC construction and operational features are different than those in existing Jaguar climate control systems Single blower and housing compact heater evaporator and blower unit provides all vehicle air flow volume requirements Single control module Unlike previous Jaguar systems the A CCM and the control panel are combined into one panel mounted control module Diagnostics All diagnostics are carried out using WDS No separate panel diagnostics are provided Scroll type compressor Anew variable displacement scrol
49. the fan motor Engine off fan operation is determined by the A CCM based on the SCP temperature message On V8 vehicles if the coolant temperature rises above 105 221 F for a period of one minute after ignition OFF the A CCM operates the auxiliary coolant pump for nine minutes in addition to the radiator cooling fan The increased coolant flow reduces the risk of boiling Service Note If air is trapped in the heater core the following symptoms will appear V6 Large temperature changes between engine idle and 2000 rpm at the Defrost air discharge and the Foot Defrost air discharge V8 Gurgle in heater core during engine OFF auxiliary coolant pump ON period Heater Pipes The heater pipe connections at the bulkhead remain the same for driver and passenger regardless of LHD or RHD vehicles The driver supply pipe is color coded white at the dual coolant control valve and green at the intermediate junction and at the bulkhead The passenger supply pipe is not color coded HEATER PIPES DRIVER SUPPLY GREEN RETURN LARGE DIAMETER DRIVER SUPPLY GREEN PASSENGER SUPPLY 703 112 NOTES Date of Issue 07 01 2002 Student Guide 3 3 3 ae S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training HEATING COOLING SYSTEM AUXILIARY COOLANT PUMP V8 Auxiliary Coolant Pump V8 As with existing V8 engines an auxiliary coolant pump lt a situated in the return s
50. the three temperatures occur simultaneously the DATC system will operate a special low blower speed defrost mode until the engine temperature reaches predetermined level Once the engine has warmed up the blower motor control will revert to the normal auto matic mode 703 120 2 At very high vehicle speed where high ram air would normally increase the air flow into the vehicle interior the A CCM adjusts the blower speed to maintain the desired air flow NOTES Date of Issue 07 01 2002 Student Guide 3 4 11 ae JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM System Details continued AIR INTAKE RHD SHOWN Climate Control Intake Air Exterior air enters the system via the grille located at the base of the windshield on the passengers side of the vehicle The grille can be removed by releasing the inte gral fasteners A serviceable air filter is located in the duct connecting the air intake to the blower housing On NAS vehicles the filter should be changed at the 10 000 mile service interval NOTES 703 121 INTAKE AIR FILTER 703 122 3 4 12 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM Ambient Air Temperature Sensor AMBIENT AIR TEMPERATURE SENSOR The ambient air temperature sensor lo
51. through the evaporator bulb on the evaporator sends informa tion about evaporator temperature through capillary tube This tube is attached to the diaphragm on the expansion valve If the evaporator becomes too cold the diaphragm pulls the needle shaped pintle up clos ing the valve and restricting refrigerant flow As the evaporator temperature rises the diaphragm presses down on the pintle opening the valve and letting more refrigerant through DIAPHRAGM PINTLE CAPILLARY TUBE VALVE TEMPERATURE SENSING BULB 1703 28 Orifice Tube Like an expansion valve an orifice tube divides the high ORIFICE TUBE COMPONENTS and low pressure parts of the A C system The orifice tube has a fixed opening The flow rate of the refriger eee KEATON ant through the opening is determined by the cycling of the compressor ORIFICE FILTER HIGH PRESSURE LIQUID SCREEN FROM THE CONDENSER 1703 29 NOTES 1 4 6 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Components 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMAT
52. to the evaporator This pipe runs under the RHS wheel arch behind the plastic trim and can be identified by the inclusion of a pressure transducer fitted to the high pressure pipe The pressure transducer is used to control over pressure in the high side of the refrigeration system This control is achieved by the engine management control module ECM disengaging the compressor clutch at a given pressure threshold The transducer signal is hardwired to the ECM and then passed on to the climate control module using the CAN bus for the final control of the cooling fan speed The final requested demand speed of the cooling fans is then sent back to the ECM over the CAN bus so that the ECM can forward the processed signal to the cooling fan s speed regulator The cooling fan regulator then PWM the two cooling fan motors 3 Evaporator inlet This assembly connects to the liquid line and runs along the engine bay bulkhead The fixed orifice tube is fitted into this pipe the short end of the fixed orifice tube butts up against a shoul der swaged in the pipe towards the evaporator 4 Evaporator outlet This assembly runs parallel to the evaporator inlet pipe along the engine bay bulkhead and connects to the suction accumulator assembly under the RHS wheel arch Refrigerant Charging System charging occurs via the two pipes that run along the engine bay bulkhead the evaporator inlet and outlet Both of these pipes have se
53. vehicle speed signal for the following functions Blower speed control Ambient temperature signal recognition Diagnostics The A CCM does not monitor the vehicle speed circuit for diagnostics NOTES Date of Issue 07 01 2002 Student Guide 2 10 5 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 10 6 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Control Module 2 8 Climate Control Panel 2 9 Temperature Control Sensors 2 10 Vehicle Systems Interfaces 2 11 Control Panel Diagnostics 2 12 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae JAGUAR Service Training XJ XX CLIMATE CONTROL SYSTEM CONTROL PANEL DIAGNOSTICS System Self Test Some system generated fault codes can be displayed on the control panel screen When a fault is flagged an audible beep will sound and the message Er will be displayed for five seconds after the ignition is switched to position Il To display stored panel fault codes follow this procedure Switch off the ignition Press and hold t
54. 02 JAGUAR SERVIC TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Components 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System XJ XK CLIMATE CONTROL SYSTEM S TYPE CLIMATE CONTROL SYSTEM X TYPE CLIMATE CONTROL SYSTEM CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 CLIMATE CONTROL ae JAGUAR Service Training REFRIGERATION SYSTEM COMPONENTS Like the liquid in the engine cooling system the refrigerant in an air conditioning system absorbs carries and releas es heat To do this the A C system utilizes many components to move heat EVAPORATOR OPERATION 703 22 Evaporator The evaporator is located near the interior of the vehi cle The evaporator removes heat from the passenger compartment and transfers the heat to the refrigerant Refrigerant enters the evaporator as a cool low pres sure liquid mist which circulates through the evaporator s tubes and fins much like coolant circu lates through an engine s radiator An electric blower fan forces warm air from the vehicle s interior over the surface of the evaporator The refrigerant absorbs heat as it changes from a liquid to a gas The refrigerant then exits the evap
55. 02 KG JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM HEATING COOLING SYSTEM The V6 and V8 engines have similar cooling systems During engine running cooling fan control is provided by the PCM After the ignition is switched off the PCM is deactivated however the need for cooling fan operation can still exist HEATING COOLING SYSTEM V6 INTERNAL BYPASS COOLANT PUMP THROTTLE PTOR DUAL COOLANT CONTROL VALVE 2 HEATER n BLEED VALVE OIL COOLER RESERVOIR THERMOSTAT Lo V T703 110 HEATING COOLING SYSTEM V8 DUAL COOLANT CONTROL VALVE s NE SN INTERNAL TT THROTTLE BYPASS ADAPTOR gt Du HEATER AUXILIARY COOLANT PUMP CORE COOLANT PUMP BLEED VALVE gt RESERVOIR BOTTLE ENGINE OIL COOLER T703 111 3 3 2 Student Guide Date of Issue 07 01 2002 KG JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM After the engine is switched off the A CCM notes the last engine coolant V8 or cylinder head V6 temperature SCP MESSAGE and provides control signal to the cooling fan module for period of four minutes to operate
56. 1 Throttle Position Sensor Element 2 Turn Signal Television V6 Engine V8 Engine Vehicle Information Control System Variable Valve Timing Valve Bank 1 Variable Valve Timing Valve Bank 2 Positive Negative Date of Issue 07 01 2002 Student Guide iii JAGUAR CLIMATE CONTROL SYSTEMS JAGUAR Service Training iv Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Components 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae JAGUAR Service Training CLIMATE CONTROL CLIMATE CONTROL OVERVIEW The climate control system is designed to provide comfort for the driver and passengers The climate control system maintains in car air temperature and humidity within range that is comfortable for the people inside and provides fresh clean air for ventilation comfortable temperature inside the vehicle helps keep the driver alert and attentive CLIMATE CONTROL PANEL BLOWER SPEED AUTOMATIC CONTROL CONTROL SWITCH AIR DISTRIBUTION
57. 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Component Location 2 8 Control Module 2 9 Climate Control Panel 2 10 Temperature Control Sensors 2 11 Vehicle Systems Interfaces 2 12 Control Panel Diagnostics 2 13 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM HEATING COOLING SYSTEM The Jaguar Climate Control System employs engine coolant to provide cabin heat An electric pump constantly cir culates engine coolant through the heater matrix when the engine is running An A CCM controlled heater valve maintains the heater matrix at the optimum temperature required to achieve the selected cabin temperature KG JAGUAR Service Training The AJV8 low volume cooling system design requires two non return valves to maintain correct coolant flow under all engine operating conditions At low engine speeds engine coolant flow pressure is less than heater pump pres sure The non return valve in the engine cooling system prevents the heater pump from recirculating coolant against the normal flow of engine coolant The heater circuit non return valve prevents hot engine coolant from flowing back into the heater matrix after the engine is switched off AJV8 N A HEATING COOLING S
58. 2 XJ XK CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 3 1 Overview 3 2 Refrigeration System 3 3 Heating Cooling System 3 4 DATC System 3 5 Windshield Backlight and Rear View Mirror Heaters 3 6 Task Sheets 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 KG JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM REFRIGERATION SYSTEM Jaguar S TYPE has conventional R134a air conditioning refrigeration system The installation of a variable displace ment scroll type compressor and the use of an air conditioning pressure sensor are components new to Jaguar The system does not require the installation of mufflers S TYPE REFRIGERATION SYSTEM RECEIVER DRIER SS HIGH SIDE TAKE OFF SCROLL TYPE COMPRESSOR THERMAL EXPANSION VALVE CONDENSER Y LOW SIDE TAKE OFF EVAPORATOR A C PRESSURE SENSOR T703 106 NOTES 3 2 2 Student Guide Date of Issue 07 01 2002 S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Scroll Type Compressor SCROLL TYPE COMPRESSOR The nominal displacement of the scroll type compres sor is 90 cc This displacement can be reduced to an effective displacement of 27 cc by an internal bypass valve that is positioned from open full bypass 27 cc to closed
59. 4 9 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training EATC SYSTEM Components continued SOLAR SENSOR Solar Sensor The solar sensor is positioned on the drivers side of the vehicle and mounted close to the defrost vent on top of the fascia The purpose of the solar sensor is to prevent the need for the driver having to react to changes in sunlight and con tinually having to raise or lower the temperature demand request This is an automatic function of the control module moving the required flaps towards cooling when the light becomes brighter as indicated by the rise in volt age The operation is damped so as not to be too 1703 158 overreactive to a quick rise then fall type of change Ambient Sensor AMBIENT SENSOR The ambient sensor is located at the front of the vehicle and is mounted on the left hand side PAS cooler bracket The role of the ambient sensor is to display the external temperature for the driver display panel On the mid line system this is constantly displayed in the climate control panel The navigation system takes the hardwired input and converts the signal into a CAN message The CAN mes sage is used by the smaller LCD display screen below the navigation screen and also by the instrument clus ter for low temperature warnings T703 159 Both panel readouts can be changed from degrees Centigrade to degrees Fahrenheit by using the appropriate but ton or sof
60. AGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM 4 4 20 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 CLIMATE CONTROL SYSTEM 4 1 4 2 4 3 4 4 Overview Refrigeration System Heating Cooling System EATC System 4 5 Service Information 4 6 Task Sheets 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM SERVICE INFORMATION Particle Filter Particle filters arrest approximately 40 of particles in the 0 3 to 1 micron range Pollen for example falls above this range because its molecule size is larger than 1 micron Particle filters will stop elements such as the following however this is not an exhaustive list and only serves to highlight a few examples Spores 4 45 microns Pollen 8 microns plus Road dust 1 100 microns Exhaust particles 0 01 100 microns Bacteria 0 7 20 microns The particle filter should be changed at 40 000 km 24 000 mi intervals ae JAGUAR Service Training Serviceable Items Blower motor Serviceable Sensors Evaporator Air discharge Ambient Solar In car Refrigeration system pressure transducer Other Serviceable Items e Heater matrix
61. AGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Component Location 2 8 Control Module 2 9 Climate Control Panel 2 10 Temperature Control Sensors 2 11 Vehicle Systems Interfaces 2 12 Control Panel Diagnostics 2 13 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM The Jaguar air conditioning system employs environmentally friendly R134a refrigerant The layout of the system is conventional however there are minor differences between the Sedan and XK8 installations BASIC SYSTEM HFC 134a EVAPORATES COOLED AIR f 4 EXPANSION EJ VALVE TEMPERATURE gt LOW PRESSURE l SENSING BULB oman LOW TEMPERATURE LIQUID h EVAPORATOR LIQUID LOW PRESSURE REFRIGERANT LOW TEMPERATURE GAS Ir Ww BLOWER AIR AIR vs mcum HIGH PRESSURE HIGH TEMPERATURE GAS ee HFC 134a LIQUEFIES COMPRESSOR COOLING FAN RECEIVER DRIER i HIGH PRESSURE HIGH TEMPERATURE LIQUID CONDENSER 7703 43 2 2 2 Student Guide Date of Issue
62. CCM the ECM uses the A C pres sure transducer as its input and passes the signal on to the A CCM The A CCM then requests the actual cooling fan speed from the ECM the ECM in turn passes this request to the cooling fan speed regulator In general terms the highest temperature signal will always be given the highest priority The blades of the fans are highly balanced units and should be handled carefully If they are mishandled vibration may result NOTES Date of Issue 07 01 2002 Student Guide 4 3 5 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training HEATING COOLING SYSTEM Components continued THERMOSTAT HOUSING Thermostat thermostat is located in housing fitted between oe Z the engine cooler housing and the water pump rail Access is via quick fit connectors The thermostat is changed along with the lower housing as a service part R thermostat is an 88 190 4 F unit The thermostat starts to open at 75 C 167 F The thermostat is fully open at 95 C 203 F Reservoir 4 0 The cooling system reservoir is appropriately sized to allow expansion and contraction of the coolant with out expelling any fluid Level marking showing the minimum and maximum fill levels are clearly visible this visibility allows coolant checks to be made very easily via the translucent reser voir molding T703 149 There is no level sensing
63. COOLANT PUMP CONTROL VALVE THROTTLE ADAPTOR gt HEATER CORE a BLEED VALVE gt ENGINE OIL COOLER RESERVOIR THERMOSTAT Se N lt T703 38 The heating system works in conjunction with the engine coolant system to transfer engine heat to the vehicle interi or The main components of the heating system are the engine heater hoses heater core electric blower motor fan and a heat shutoff device Hot engine coolant is moved by the coolant pump through the heater hoses to the heater core The heater core is like the radiator of the engine The heater core has tubes with fins also like the A C evapora tor Heater cores are normally mounted in tandem next to A C evaporators and use the same blower motor and air distribution system The heat from the coolant is transferred to the air passing through it by the blower motor The heated air is then moved through the vehicle by the air distribution system NOTES 1 7 2 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Components 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System 2 CLIMATE CONTROL SYSTEM
64. Control Module Supply Voltage Connector IP101 White 26 way 14 Wire U CJB 10 amp fuse F75 However fuse F75 in the CJB is supplied by fuse F7 located in the BJB The minimum and maximum battery voltages are between 9 16v Without this power supply voltage control module memory is lost and with it the panel setting position The ignition input is provided for wake up and shut down strategies in the form of anti misting control DTC storage and temperature display logic The system also uses ignition to power certain other functions such as the motorized aspirator The main battery supply is used to keep the panel set tings in memory The normally accepted battery supply voltage range is between 9 16 Should this supply be lost then the CM defaults to Auto 23 C when the battery is re connected The control module will enter protection mode to prevent damage to electronics and LEDs should the voltage rise above 16v If the battery level falls to below 7 5 volts then the con trol module will drive the door to near open or close position Normal operation will be resumed when the supply voltage returns The system will recalibrate the stepper motors upon battery reconnection this relearns the flap end to end stop positions Stepper motor calibration can take up to 30 seconds It is advised not to operate any of the panel controls while this takes place as it interr
65. Control System to the second level menu Highlight but do not open Air Conditioning 2 Select Guided Diagnostics from the top of the screen From the menu displayed highlight Heating System and press the tick 4 From the menu displayed highlight Coolant Control Valves and press the tick Follow the instructions displayed on the screen When the test is completed press the Vehicle Selector tab at the top of the screen 6 Press the Log Viewer tab at the bottom left of the screen How did WDS determine the status of the Coolant Control Valve operation Demonstrates Competence Instructor Signature Date Date of Issue 07 01 2002 Student Guide 3 6 9 x JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM 3 6 10 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 CLIMATE CONTROL SYSTEM 4 1 Overview 4 2 4 3 4 4 4 5 4 6 Refrigeration System Heating Cooling System EATC System Service Information Task Sheets 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 se X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training OVERVIEW As on the S TYPE the air conditioning system fitted to the X TYPE uses mostly Visteon made electric
66. E CONTROL T703 01 NOTES Date of Issue 07 01 2002 Student Guide JAGUAR CLIMATE CONTROL SYSTEMS ae JAGUAR Service Training ACRONYMS AND ABBREVIATIONS The following abbreviations and acronyms are used throughout the Jaguar Service Training Student Guides A C A CCM APP SENSOR APP1 APP2 AUTO B BANK1 BANK 2 CAN CKP SENSOR CM CMP SENSOR 1 CMP SENSOR 2 D2B DATC DLC DSC ECM ECT SENSOR EFT SENSOR EGR EGT SENSOR EOT SENSOR EVAP CANISTER CLOSE VALVE EVAP CANISTER PURGE VALVE FTP SENSOR GECM GPS HID HO2 SENSOR 1 1 HO2 SENSOR 1 2 HO2 SENSOR 2 1 HO2 SENSOR 2 2 IAT SENSOR IC ICE IMT VALVE 1 IMT VALVE 2 IP SENSOR KS 1 KS 2 LH LHD MAF SENSOR MAN MAP SENSOR N A NAS NTC OAT PATS PCM Air Conditioning Air Conditioning Control Module Accelerator Pedal Position Sensor Accelerator Pedal Position Sensor Element 1 Accelerator Pedal Position Sensor Element 2 Automatic Transmission Battery Voltage RH Cylinder Bank Cylinders 1 3 5 7 LH Cylinder Bank Cylinders 2 4 6 8 Controller Area Network Crankshaft Position Sensor Control Module Camshaft Position Sensor RH Bank Camshaft Position Sensor LH Bank D2B Network Dual Automatic Temperature Control Data Link Connector Dynamic Stability Control Engine Control Module Engine Coolant Temperature Sensor Engine Fuel Temperature Sensor Exhaust Gas Recirculati
67. E CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae JAGUAR Service Training CLIMATE CONTROL LUBRICANTS Refrigeration oil lubricates the moving parts and seals of an A C system The oil flows with the refrigerant through out the system Refrigeration oil and motor oil are different Never use motor oil in an A C system Mineral Oil and PAG Oil The type of refrigeration oil used A C system depends on the type of refrigerant When engineers develop refrigerant they simultaneously develop the lubrication oil used with it R 12 A C systems use mineral oil as a lubricant R 134a systems use an oil made of polyalkylene glycols commonly called PAG oil PAG oil and mineral oil are completely incompatible and should never be mixed Characteristics of Refrigeration Oil Refrigeration oil either mineral or PAG oil is highly refined and free of the additives and detergents found in con ventional motor oil Refrigeration oil flows freely at temperatures well below freezing and it includes an additive to prevent foaming in the A C system Refrigeration oil readily absorbs moisture If stored improperly the oil becomes unusable For example an unsealed container of oil becomes saturated with two percent water if left in humid climate for five days If you use saturated oil in an A C system acids form damaging seals and other compo nents Always seal refrigerant oil properly a
68. ED 7703 99 Control Panel Display The display gives the driver a visual presentation of the system s current selections and operation Blower speed A bar graph displays the blower speed during manual control Temperature The interior or exterior temperature is displayed numerically Exterior temperature is select ed by pressing the EXT button Momentary press one beep four second display Long duration press two beeps continuous display Temperature scale F Fahrenheit or C Celsius is displayed by pressing the F or C button Exterior temp EXT is displayed when the exterior temperature is selected The exterior temperature will option continue to be displayed if the system is switched off Automatic mode AUTO is displayed when the system is in automatic mode Any manual overrides will switch off the AUTO indicator Displayed exterior To compensate for heat soak conditions the displayed exterior temperature is stored in temperature memory for one hour after the ignition is switched OFF If the ignition is switched ON before one hour has elapsed and the ambient temperature has risen the stored tem perature is displayed if the ambient temperature has dropped the lower temperature is displayed When the ignition is switched ON after one hour the current ambient temperature is displayed 2 8 2 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training
69. ES Date of Issue 07 01 2002 Student Guide 4 5 3 x JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM 4 5 4 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 CLIMATE CONTROL SYSTEM 4 1 4 2 4 3 4 4 4 5 Overview Refrigeration System Heating Cooling System EATC System Service Information 4 6 Task Sheets 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training TASK SHEET 1 AIR DISTRIBUTION STEPPER MOTORS Run engine Select each air distribution in turn Wait 10 seconds for each flap to get into position Record results in the table below Manual Mode Full Cold Temperature Demand Control Panel Selections Datalogger Selection Panel Foot Panel Foot Defrost Foot Defrost Air Blend Door Panel Vent Defrost Vent Recirculation Door Manual Mode Full Hot Temperature Demand Control Panel Selections Datalogger Selection Panel Foot Panel Foot Defrost Foot Defrost Air Blend Door Panel Vent Defrost Vent Recirculation Door What does the recirculation door control When the temperature demand is set to full
70. HEATING REQUIRED 6 SECONDS CLOSED 12 120 50 9 OPEN 0V 50 CLOSED 12 80 OPEN 0V 20 CLOSED 12V i i 20 5 OPEN 0V 7703 75 guum s HEATER ENGINE T703 74 The A CCM drives the valve with a 12 volt six second duty cycle signal The A CCM increases or decreases the length of the 12 volt signal within the duty cycle to achieve the required heater matrix temperature If the drive circuit fails open circuit the valve defaults to the open position to allow full engine coolant flow to the heater matrix The A CCM uses the control panel settings and the heater matrix temperature sensor input signals to achieve the optimum heater matrix temperature To prevent the circulation of cool engine coolant through the heater matrix the heater valve is driven closed dur ing the following conditions Engine coolant temperature below 86 F 30 C 18 F 10 C No engine speed signal present The A CCM does not monitor the heater valve circuit for diagnostics NOTES 2 4 4 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training Heater Matrix Sensor The NTC negative temperature coefficient heater matrix sensor located on the right side of the heater matrix in the air conditioning heater unit provides the A CCM with a voltage s
71. If the evaporator temperature falls to 0 C 32 F the A CCM will cancel the A C request to the ECM and switch off the compressor to prevent the evaporator matrix from freez ing When the evaporator temperature rises to approximately 3 C 37 5 F the A CCM will again request A C from the ECM Approximate Temperature Versus Voltage EVAPORATOR TEMPERATURE SENSOR Temperature Voltage 32 37 90 100 1 50 26 31 79 89 1 75 21 25 70 78 2 00 17 21 63 70 2 25 13 18 56 65 2 50 08 13 47 56 2 75 05 09 42 49 3 00 01 04 35 40 3 25 05 0 23 32 3 50 703 65 Evaporator Temperature Sensor Diagnostic Monitoring The A CCM monitors the evaporator temperature sensing circuit for open circuit high resistance and short circuit conditions If a fault is present a DTC will be flagged A default value of 0 C 32 F is substituted by the A CCM if an evaporator temperature sensor fault is present The compressor will not run when an evaporator temperature sensor fault is flagged DTCs WDS Control Panel B1946 13 B1947 13 NOTES 2 2 14 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Cond
72. Ignition switched power supply pos I Aux circuit Face button LED Clock circuit Bi level button LED Start circuit Foot button LED Data circuits Defrost foot button LED Panel lighting Recirc button LED Headlights ON EXERCISE Perform the System Self Test above on the assigned vehicle Record any faults below OBD II DTCs Control Panel Code 2 11 2 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training XJ XK CLIMATE CONTROL SYSTEM Actuator Check The control panel system actuators and certain components can be checked by simultaneously holding AUTO and FRESH RECIRC while the vehicle is being started Control Panel All of the panel control LEDs and LCD segments will flash on and off to indicate that each panel circuit is OK If a LED does not flash a fault condition in that area of the panel is indicated or the LED has failed If a LCD segment does not flash a fault condition in that area of the panel is indicated or the LCD segment has failed Actuators and Components Check the actuators by selecting AUTO then FRESH RECIRC Select FACE to cycle through the actuator mode conditions 20 27 as shown in the following table After the check is complete select PUSH OFF to restore normal system operation Actuator Check Chart Mode levet Face Foot Defrost bypass Compressor Nene pump
73. Interfaces 2 12 Control Panel Diagnostics 2 13 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING HEATER UNIT Blowers The blower assemblies each contain a motor fan servo and fresh air recirculation flap They connect to either side of the air conditioning heater unit with ducts Each blower incorporates a power transistor assembly to regulate air flow output volume The A CCM varies the voltage applied to the base of the power transistor to vary the blower motor speed and thus the air flow output volume During normal operation power is supplied to the blower motors via the blower motor relay The motor ground is completed by the power transistor circuit to provide varying blow er motor speed When maximum blower output is required the A CCM activates the high speed relay which switches the blower motor ground circuit directly to ground and the motor runs at maximum speed In AUTO mode blower motor variable speed is controlled automatically by the A CCM In manual control 11 speed steps are available Through the 1997 MY to compensate for the effect of ram air on the air intakes the A CCM adjusts blower speed at vehicle speed above 25 mph 40 km h Blower speed compensation is canceled during the following conditions M
74. J6 1995 97 MY REFRIGERANT SINGLE PRESSURE SWITCH lw LOE 147 PSI gt 12 BAR gt LOW SPEED FAN RELAY HIGH SPEED ON RIGHT FAN l was RADIATOR THERMOSTATIC SWITCH 230551 gt RELAY I HIGH SPEED ON HIGH SPEED 20 BAR gt l REFRIGERANT w DUAL PRESSURE SWITCH PART OF TRIPLE SWITCH FAN CONTROL LEFT FAN RELAY MODULE 1703 66 AJ16 COOLING FAN CONTROL FROM VIN 761570 XJ6 1995 97 MY IGNITION SWITCHED B LOW SPEED FAN RELAY RIGHT FAN RADIATOR THERMOSTATIC SWITCH HIGH SPEED ON HIGH SPEED 290 PSI gt 20 BAR gt FAN RELAY REFRIGERANT DUAL PRESSURE SWITCH PART OF TRIPLE SWITCH FAN CONTROL LEFT FAN RELAY MODULE 1703 67 Date of Issue 07 01 2002 Student Guide 13 AJ16 V12 CLIMATE CONTROL JAGUAR Service Training HEATING COOLING SYSTEM 16 and V12 heating systems function similarly to theAJV8 heating system AJ16 N A HEATING COOLING SYSTEM EXPANSION TANK HEATER PUMP HEATER RADIATOR MATRIX THERMOSTAT 7703 69 14 Student Guide Date of Issue 07 01 2002 AJ16 V12 CLIMATE CONTROL Heater Pump Diagnostic Monitoring Heater pump diagnostic monitoring occurs only on 1995 MY vehicles up to VIN 739425 These vehicles use a high current draw motor with the ground circuit com pleted throug
75. L MODULE IN CAR TEMPERATURE SENSOR v LH DISCHARGE AIR TEMPERATURE SENSOR I u SS k U DUAL AMBIENT TEMPERATURE BLOWER DUAL RH DISCHARGE AIR COOLANT CONTROL VALVE SENSOR SOLAR SENSOR TEMPERATURE SENSOR T703 115 Date of Issue 07 01 2002 Student Guide 3 4 5 ae JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM Air Conditioning Control Module The DATC A CCM is a single module packaged in the center of the fascia The control module is microprocessor based consisting of a bezel assembly including all buttons and switches main control board and housing for the assembly Battery direct and ignition switched B power is supplied from the primary junction box The A CCM control panel provides the following driver interface controls AUTO mode OFF Driver and passenger individual temperature adjustment Manual fan speed Manual A C control AIR mode DEFROST mode Four manual air distribution modes Exterior temperature display F C selection e Heated windshield wiper park or optional standard fit certain markets heated windshield Heated backlight includes exterior rear view mirrors A confirmation chime is emitted from the A CCM when any control
76. L MODULE CC29 CC30 CC31 T703 97 ae JAGUAR Service Training The air conditioning control module A CCM located on the right side of the air conditioning heater unit controls all system sensing and drive functions The A CCM has two microprocessors one 8 bit and one 4 bit The 8 bit microprocessor controls the overall system strategy and stores input output information The 4 bit microprocessor conditions the system sig nals and processes information The A CCM uses discrete components plus analog to digital circuits to interface between the microproces sors input sensors and output devices Software programmed into an EPROM is used for control data and diagnostics Ignition switched power activates the A CCM when the ignition is switched to position 11 Quiescent current from a battery power supply is used to keep the A CCM random access memory RAM active so that diagnostic information is maintained The A CCM contains four connector sockets A rough guide to the connector function grouping is as follows Isolate Relay ok Description Function CC28 AC1 26 way system component drives compressor clutch status CC29 AC2 16 way sensor inputs feedback inputs vehicle interface CC30 AC3 12 way sensor inputs control panel communication grounds vehicle interface CC31 AC4 22 way power supplies grounds signal grounds vehicle interface The A C isolate relay
77. LD HEATERS HEATER ON OFF HEATER ON OFF lt WINDSHIELD HEATER RELAYS HEATER ON OFF HEATED BACKLIGHT REAR WINDOW HEATER RELAY HEATERS ON OFF Sime MIRROR HEATERS MIRROR HEATER RELAY Senn COMMUNICATIONS DATA LINK WDS A C CONTROL MODULE T703 93 2 6 2 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training FLAP POSITION AJV8 CONTROL MODULE INPUTS OUTPUTS XJ XK 1997 MY ON LEFT FRESH RECIRC FLAP SERVO DRIVE BLOWER SPEED FEEDBACK POTENTIOMETER N LEFT FRESH RECIRC FLAP BLOWER CONTROL POWER TRANSISTOR BLOWER HIGH SPEED LEFT BLOWER FLAP POSITION LEFT BLOWER RELAY RIGHT FRESH RECIRC FLAP SERVO DRIVE BLOWER SPEED FEEDBACK POTENTIOMETER N RIGHT FRESH RECIRC FLAP BLOWER CONTROL POWER TRANSISTOR gt BLOWER HIGH SPEED RIGHT BLOWER SYSTEM CONTROL A C HEATER PUMP ON OFF RIGHT BLOWER RELAY HEATER VALVE CONTROL o HEATER PUMP HEATER PUMP RELAY FLAP POSITION COOL AIR BYPASS FLAP SERVO DRIVE gt HEATER VALVE FEEDBACK POTENTIOMETER 6 COOL AIR BYPASS FLAP FLAP POSITION FACE VENT FLAP SERVO DRIVE FEEDBACK POTENTIOMETER FACE VENT FLAP FLAP POSITION DEFROST FLAP
78. MIRROR HEATERS NOTE All glass heaters operate only while the engine is running System battery voltage must be above predetermined level for heater operation Heated Windshield Heated Windshield Wiper Park Vehicles are fitted with either heated windshield wiper park or heated windshields Heated windshields have two LH and RH heating elements with two control and activation circuits Heated wiper park windshields have one heating element in the wiper park area The heated wiper control and activation circuit is the same circuit used for the RH windshield heater The circuits incorporate relays located in the front power distribution box Heated Windshield Control A CCM activates the windshield heaters for four minute time period when either heated windshield or defrost is selected on the control panel If low battery voltage is sensed by the A CCM the windshield heaters will be dis abled If defrost is selected then the ignition switched OFF ON heated windshield will be disabled Heated Wiper Park Control The A CCM activates heated wiper park either automatically or manually If the ambient temperature is below 4 C 40 F at engine start the A CCM will automatically activate heated wiper park f while engine operating the ambient temperature falls below 1 C 34 F the A CCM will automatically acti vate heated wiper park provided it did not activate previously during the ignition cycle As
79. N OFF ON OFF Low 90 C 194 F 86 C 187 F 12 bar 174 psi 8 bar 116 psi Fast 97 5 C 207 5 F 93 5 C 200 5 F 20 bar 290 psi 17 5 bar 254 psi On all vehicles when the engine is switched off the ECM remains powered up for a few seconds to complete EMS adaptions If the fans are operating when the engine is switched off the ECM continues to drive the fans for 5 min utes or until the coolant temperature decreases to a preset value If the fans are off when the engine is switched off and the coolant temperature rises to the switch on point during the time the ECM is still powered it will switch the fans on The fans will operate for five minutes or until the coolant temperature decreases to a preset value NOTES 2 3 2 Student Guide Date of Issue 07 01 2002 XJ CLIMATE CONTROL SYSTEM JAGUAR Service Training COOLING FAN CONTROL LOW SPEED FAN RELAY RIGHT FAN LOW SPEED ON 112 BAR 174 um MP nesen HIGH SPEED FAN RELAY REFRIGERANT 4 WAY PRESSURE SWITCH ENGINE CONTROL LEFT FAN MODULE FAN CONTROL RELAY MODULE T703 68 NOTES Date of Issue 07 01 2002 Student Guide 233 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 3 4 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview
80. ONDENSER OUT TO RECEIVER DRIER GI 9 COMPRESSOR 5 gt gt gt gt 9 gt 2 x gt T703 45 NOTES 4 Student Guide Date of Issue 07 01 2002 EG AJ16 V12 CLIMATE CONTROL JAGUAR Service Training V12 Condenser Multi Path Refrigerant flows through the condenser in separate paths starting at one side and exiting at the other MULTI PATH CONDENSER d OUT TO RECEIVER DRIER 4 gt c gt c 703 46 NOTES Date of Issue 07 01 2002 Student Guide 5 se AJ16 V12 CLIMATE CONTROL JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM RECEIVER DRIER LOCATION Receiver Drier On AJ16 an V12 installations the receiver drier is hori zontally mounted at the top of the condenser NOTES CONDENSER ge ee j RECEIVER DRIER HU T703 47 6 Student Guide Date of Issue 07 01 2002 Service Training JAG AJ16 V12 CLIMATE CONTROL Compressor AJ16 COMPRESSOR LOCATION XJ12 6 0L COMPRESSOR LOCATION NOTES Student Guide Date of Issue 07 01 2002 se AJ16 V12 CLIMATE CONTROL JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM Comp
81. ONE 68 50 32 14 4 22 40 58 7703 06 Heat Measurement Cold is merely the absence of heat Cold is what is left if all heat is removed Heat will always travel to cold An example of this is a cooling pan on a hot stove The heat on the bottom of the pan will travel toward the cold handle Heat is relatively easy to measure and its meth ods of movement are very predictable and controllable Vehicle air conditioning systems create a cold spot in the interior of the vehicle giving the heat a cold area to transfer to Temperature Temperature or heat intensity is measured using a ther mometer Heat intensity is important because the human comfort zone is 21 27 C 65 80 P If the temperatures fall above or below this comfort zone the passengers may become uncomfortable NOTES 1 2 2 Student Guide Date of Issue 07 01 2002 KG JAGUAR Service Training CLIMATE CONTROL Heat Quantity HEAT MEASUREMENT IN CALORIES Heat quantity is measured in joules or British ther mal units BTU typical wooden match produced 1 051 joules of heat 4 2 joules is the amount of energy lt Q RS required to raise the temperature of 1 g of water one degree Celsius A liter of gasoline has approximately 117 million joules of heat energy Heat energy can be converted into mechanical energy by the engine to move the vehicle HVAC systems must also transfer heat to energy to and from th
82. PEED BLOWER PROCESSOR LIGHTING SWITCHES DIMMER CONTROL INST SCP lt DATA gt VEHICLE SPEED ABS DSC SCP lt DATA gt VOICE CONTROL lt DATA gt OPTIONAL VOICE SCP A C REFRIGERANT PRESSURE CYLINDER HEAD TEMPERATURE V6 COOLANT TEMPERATURE V8 ENGINE SPEED ENGINE OFF POWERTRAIN CONTROL MODULE 6 ACTUATOR DOOR POSITIONS DRIVER COOLANT CONTROL VALVE PASSENGER COOLANT CONTROL VALVE AUXILIARY COOLANT PUMP V8 AIR DISTRIBUTION ACTUATORS BLOWER MOTOR CONTROLLER HEATED WIPER PARK OR WINDSHIELD HEATERS HEATED BACKLIGHT lt DATA gt RECM SCP REAR VIEW MIRROR HEATERS KC DATA gt WDS DIAGNOSTICS PROGRAMMING SCP RADIATOR COOLING FAN ENGINE OFF RADIATOR COOLING FAN ENGINE ON A C COMPRESSOR CLUTCH T703 117 Date of Issue 07 01 2002 Student Guide 3 4 9 ae JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM Control Summary continued Air Distribution Air distribution can be controlled automatically or manually If AUTO is selected the A CCM will automatically determine the appropriate air distribution If the driver wishes to manually control air distribution the four manual air distributions buttons allow the desired setting AIR DISTRIBUTION
83. S MIRROR HEATER RELAY lt SERIAL COMMUNICATIONS DATA LINK Y SYSTEM CONTROL PDU A C CONTROL MODULE 703 91 16 Student Guide Date of Issue 07 01 2002 AJ16 V12 CLIMATE CONTROL JAGUAR Service Training AJ16 AND V12 CONTROL MODULE INPUTS OUTPUTS XJ6 1995 97 FLAP POSITION LEFT FRESH RECIRC FLAP SERVO DRIVE LEFT FRESH RECIRC FLAP FEEDBACK POTENTIOMETER POWER TRANSISTOR BLOWER SPEED BLOWER CONTROL BLOWER HIGH SPEED LEFT BLOWER HIGH SPEED RELAY FLAP POSITION RIGHT FRESH RECIRC FLAP SERVO DRIVE BLOWER SPEED BLOWER CONTROL gt BLOWER HIGH SPEED RIGHT BLOWER SYSTEM HIGH SPEED RELAY CONTROL A C HEATER PUMP ON OFF HEATER PUMP HEATER VALVE CONTROL RELAY FLAP POSITION FEEDBACK POTENTIOMETER COOL AIR BYPASS FLAP SERVO DRIVE gt N FLAP POSITION FEEDBACK Q FACE VENT FLAP SERVO DRIVE POTENTIOMETER Dog FLAP POSITION FEEDBACK Q DEFROST FLAP SERVO DRIVE POTENTIOMETER gt FLAP POSITION FEEDBACK FOOT FLAP SERVO DRIVE POTENTIOMETER gt ELECTRICAL LOAD LOAD INHIBIT V12 POWER TRANSISTOR COOL AIR BYPASS FLAP FACE VENT FLAP DEFROST FLAP FOOT FLAP LEFT BLOWER FEEDBACK POTENTIOMETER RIGHT FRESH RECIRC FLAP RIGHT BLOWER e HEATER PUMP
84. TI BATTERY CIRCUIT POWER SUPPLY IGNITION micro L CIRCUIT J POWER SUPPLY 2 27 BAR REFRIGERANT DUAL PRESSURE SWITCH COMPRESSOR CLUTCH RELAY AJ16 PART OF TRIPLE SWITCH RELAY COIL DRIVE GND COMPRESSOR REQUEST COMPRESSOR ON ELECTRICAL LOAD COMPRESSOR ENGINE SPEED CLUTCH EVAPORATOR CONTROL TEMPERATURE SENSOR ENGINE LOAD LOAD INHIBIT V12 A C CONTROL MODULE ENGINE CONTROL MODULE 7703 58 Date of Issue 07 01 2002 Student Guide 9 x JAGUAR Service Training AJ16 V12 CLIMATE CONTROL AIR CONDITIONING REFRIGERATION SYSTEM Compressor Lock Sensor V12 only V12 DRIVE BELT XJ12 1995 97 MY Because the power steering pump and air conditioning compressor are driven by the same belt on the V12 a compressor lock sensor is installed to provide the with an input to verify correct operation 7703 60 10 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training AJ16 V12 CLIMATE CONTROL Refrigerant Pressure Switches If the refrigerant pressure is low or high the refrigerant dual pressure switch contacts will open to signal the to switch the compressor off Low pressure can result from a system leak or low ambient temperature High pres sure can be cause by poor system performance system bl
85. TO MODE OFF FACE FACE AND FOOT DEMIST AND LEVEL FOOT LEVELS LEVEL FOOT LEVELS T703 116 NOTES Date of Issue 07 01 2002 Student Guide 3 4 7 ae JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM Control Summary The A CCM automatically maintains the selected driver and passenger interior temperatures and regulates the volume of airflow between the various system outlets Separate driver and passenger discharge temperatures are made possi ble by the heater system that incorporates partitioned dual zone heater core and dual coolant flow control valve Air Intake Depending on the interior temperature when the system is activated the A CCM automatically selects between fresh intake air and recirculated cabin air however the driver has the option for manually selecting RECIRCULA TION FRESH If the manual recirculation button is pressed for short period one chime timed recirculation is enabled Timed recirculation varies with air conditioning compressor status and ambient temperature If the compressor is off A C LED OFF recirculation will be enabled for 1 to 6 minutes by the A CCM If the compressor is on A C LED ON recirculation will be enabled for 1 to 12 minutes by the A CCM If the manual recirculation button is pressed for a long period two chimes latched recirculation is enabled All manual recirculation settings are canceled at the next ignition switc
86. V HEATER VALVE COMPRESSOR ENGINE SPEED ENGINE LOAD I COMPRESSOR ON OFF COMPRESSOR REQUEST T COMPRESSOR CLUTCH ENGINE CONTROL MODULE RELAY COMPRESSOR ON CLUTCH LOCK SENSOR V12 ONLY COMPRESSOR SPEED V12 ONLY A C CONTROL MODULE 703 92 Date of Issue 07 01 2002 Student Guide 17 AJ16 V12 CLIMATE CONTROL COMPONENT LOCATION ea JAGUAR Service Training 24 1 25 23 22 21 INSTRUMENT PACK DEFROST SERVO AIR DISTRIBUTION BOX SOLAR SENSOR CONTROL PANEL CONNECTOR LEFT SIDE BLOWER HEATER PUMP HEATER VALVE o LEFT SIDE FRONT FUSE BOX HEATER PUMP RELAY w FASCIA SWITCHPACK CONNECTOR CENTER CONSOLE CONNECTOR 2 ALIA A UN 20 19 1817 COOLANT TEMPERATURE SENSOR l li 7 7 7 d ES z S EOE s AJ16 AND V12 CLIMATE CONTROL COMPONENTS XJ 1995 97 MY RIGHT HAND DRIVE SHOWN AMBIENT TEMPERATURE SENSOR COMPRESSOR COMPRESSOR CLUTCH RELAY AIR CONDITIONING CONTROL MODULE TRIPLE PRESSURE SWITCH AJ16 DUAL PRESSURE SWITCH V12 SINGLE PRESSURE SWITCH AJ16 RIGHT SIDE BLOWER ENGINE CONTROL MODULE ASPIRATOR AND IN CAR TEMPERATURE SENSOR A C ISOLATE RELAY LEFT SIDE BLOWER RELAY RIGHT SIDE BLOWER RELAY 7703 95 18 Student Guide Date of Issue 07 01 2002
87. XK CLIMATE CONTROL SYSTEM JAGUAR Service Training Expansion Valve TYPICAL EXTERNAL EQUALIZING EXPANSION VALVE The expansion valve is located within the air condition ing heater unit on the evaporator inlet Evaporator The evaporator is located within the air conditioning heater unit behind the center console It is the system low side heat exchanger NOTES TEMPERATURE SENSING BULB 7703 49 EVAPORATOR TEMPERATURE SENSOR 7703 50 Date of Issue 07 01 2002 Student Guide 2 2 5 se XJ CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING REFRIGERATION SYSTEM Compressor The refrigerant is compressed and circulated by a ten cylinder swash plate type compressor The compressor drive shaft connects to a swash plate that operates five double ended pistons This compressor design allows one end of each piston to be on the suction stroke while the other end is on the compression stroke resulting in smooth quiet operation As a safety feature a pressure relief valve in the compressor vents refrigerant at 41 bar 594 psi and resets at approximately 28 bar 406 psi COMPRESSOR SWASH PLATE PISTON SUCTION VALVE DISCHARGE VALVE T703 51 2 2 6 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM COMPRESSOR OPERATION COMPRESSOR LOCATION Student Guide
88. YSTEM NON RETURN HEATER VALVE PUMP RADIATOR HEATER VALVE NY NON RETURN THERMOSTAT VALVE T703 70 NOTES 2 4 2 Student Guide Date of Issue 07 01 2002 KG JAGUAR Service Training XJ XK CLIMATE CONTROL SYSTEM Heater Pump HEATER PUMP AND VALVE The pump is operated continuously by the A CCM ares when the A CCM receives an engine speed signal and PUMP the engine coolant temperature is above 30 C 86 F 10 C 18 F The A CCM grounds the heater pump relay coil circuit to activate the pump If the ignition is switched on and the engine is not running the pump is switched off NOTES HEATER VALVE T703 171 HEATER COOLANT FLOW ENGINE HEATER NON RETURN VALVE PUMP SUPPLY gt HEATER MATRIX HEATER VALVE RETURN HEATER NON RETURN VALVE T703 73 Date of Issue 07 01 2002 Student Guide 2 4 3 XJ XK CLIMATE CONTROL SYSTEM HEATING COOLING SYSTEM Heater Valve ae JAGUAR Service Training Coolant circulation to the heater matrix is controlled through a variable duty cycle valve The A CCM drives the valve to fully open or closed to control the heater matrix temperature HEATER VALVE ENGINE HEATER aim Es HEATER cam ENGINE HEATER VALVE DRIVE SIGNALS SYSTEM BLEND COOLING REQUIRED
89. a affect the environment differently EFFECTS OF CHLORINE ON THE OZONE LAYER R 12 is the common name for Dichlorodifluo romethane 12 CFC 12 a chemical used in many types of refrigeration systems up until about 1990 R 12 con tains a single carbon atom surrounded by two fluorine atoms and two chlorine atoms The chemical formula for 12 is R 12 is a suitable refrigerant because of its excellent ability to absorb large quanti ties of heat In the mid 1980s scientists discovered that chemicals called chloro fluorocarbons CFC were destroying the ozone in the atmosphere Ozone protects the earth DEPLETION from harmful ultraviolet rays released by the sun One of the major contributors to CFCs in the atmosphere was R 12 which often leaked into the atmosphere dur ing servicing of A C systems In 1987 many countries signed an international agreement calling for the gradu al phase out of CFCs As a result R 12 was phased out of all new automotive A C systems Many countries also have laws mandating that A C technicians must be properly trained on refrigerant extracting and reclaim ing before working on an A C system NOTES 7703 15 1 3 2 Student Guide Date of Issue 07 01 2002 CLIMATE CONTROL HFC134a or R 134a Because of the environmental damage caused by R 12 scientists developed an alternative refrigerant called R 134a Most vehicles manufactured from 1990 to the
90. ae JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM EATC SYSTEM Components continued EVAPORATOR AND DISCHARGE SENSORS Incorrect Sensor Fitment The identification of the evaporator and discharge sen sors is very easy using their color coding Black discharge sensor White evaporator sensor However the two harness connectors are both black and it is possible to connect them to the wrong sensor Should this occur the control module will read exactly the opposite of what it expected The control module evaporator feedback would regis ter a heat signal i e low resistance therefore low volts 1703 162 While the air discharge pin would register cold i e high resistance therefore high volts The result will be full heating as the temperature blend flap will close off the evaporator side and open the heater matrix side as far as possible NOTES 4 4 14 Student Guide Date of Issue 07 01 2002 Kane X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Stepper Motors Three stepper motors are used for controlling the door positions Defrost Panel floor Air temperature blend Each stepper motor has five wires One 12v supply from the CM Four wires pulsed in pairs STEPPER MOTORS DEFROST KR GAR KR GAR RON W 0 Te T703 163 There are no feedback pots position of the door is
91. aining AIR CONDITIONING HEATER UNIT Air Distribution The air conditioning heater unit is located behind the fascia and is connected by ducts to the right and left blowers The unit directs air into the cabin at the desired temperature via a series of servo motor operated flaps The position of the flaps is fed back to the A CCM by non adjustable potentiometers integrated with the servo motors The air conditioning heater unit directs outlet air to the various cabin vents The air distribution box located on top of the air conditioning heater unit directs air to the windshield side vents and face vents AIR CONDITIONING HEATER UNIT SERVOS TO AIR DISTRIBUTION BOX Og d c e b 7 LE FROM ES w 1 EACH SIDE 1703 77 AIR DISTRIBUTION BOX FROM AIR CONDITIONING HEATER UNIT 7703 78 2 5 4 Student Guide Date of Issue 07 01 2002 se JAGUAR Service Training XJ XK CLIMATE CONTROL SYSTEM Cabin Air Distribution Air is distributed to the cabin from multiple vents located at the face level foot level windshield side windows rear foot wells and rear center console AIR DISTRIBUTION XJ XK 7703 82 Face Vent Differential Temperature Control through 1997 only The face vent differential control is a potentiometer that provides the A CCM with a feedback voltage to indicate the face level differential air tem
92. al components For the North American market there are two versions of the electronic automatic temperature control system Telematics version EATC Non Telematics version The basics of the refrigeration system remain the same as on previous systems except for the refrigerant control which is handled by an orifice tube and a suction accumulator which are used instead of the expansion valve and receiver drier as on X XK and S TYPE models NOTES 4 1 2 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 CLIMATE CONTROL SYSTEM 4 1 Overview 4 2 Refrigeration System 4 3 4 4 4 5 4 6 Heating Cooling System EATC System Service Information Task Sheets 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 a JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM REFRIGERATION SYSTEM X TYPE REFRIGERATION SYSTEM COMPONENTS EVAPORATOR INTAKE LINE EVAPORATOR DISCHARGE LINE EVAPORATOR CORE COMPRESSOR AND CLUTCH ASSEMBLY CONDENSER SUCTION DISCHARGE LINE SUCTION ACCUMULATOR LIQUID LINE 703 140 4 2 2 Student Guide Date of Issue 07 01 2002
93. applied which is used as a feedback signal This input is used to control the air temperature blend flap in conjunction with the temperature demand input for controlling the cabin tempera ture to the desired level A simple test to check for motorized aspirator operation is to place a light piece of tissue against the intake grille and switch on the ignition If the motor is running then it should draw the tissue towards the grille Do not use the cigar lighter to test for in car sensor operation the unit has a damped operation so results do not show too readily and secondly you risk damaging the fascia as you move the heat source closer Concerns with the in car temperature sensor will show as erratic in car temperature stability If a fault occurs a DTC will be provided and the system will not have automatic control NOTES Date of Issue 07 01 2002 Student Guide 4 4 11 ae JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM EATC SYSTEM Components continued EVAPORATOR SENSOR Evaporator Sensor The evaporator sensor is used to control the compres sor clutch cycling and with it refrigerant flow through the system At 0 C 32 F the evaporator temperature signal is used by the control module to switch off the compressor clutch thus preventing the evaporator from icing and reducing system performance At 3 C 37 F and above compressor clutch operation is permitted The compres
94. ard within the cabin DUAL COOLANT CONTROL VALVE DUTY CYCLE After the ignition is switched OFF the valves are driven to the closed position for 5 minutes to prevent hot flush in the heater core if the vehicle is switched back on VALVE OPEN 12 V The hose connections to the dual coolant control valve VALVE CLOSED 0 V are color coded to prevent incorrect assembly 3 SECOND DUTY CYCLE HEATING MODE VALVE CLOSED The valve coil resistance is 15 Q at 20 C 68 F VALVE OPEN 12 V NOTES VALVE CLOSED 0 V T 3 SECOND DUTY CYCLE BLEND MODE VALVE MODULATED VALVE OPEN 12 V VALVE CLOSED 0 V 3 SECOND DUTY CYCLE COOLING MODE VALVE OPEN 703 134 Date of Issue 07 01 2002 Student Guide 3 4 19 x JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM 3 4 20 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 3 1 Overview 3 2 Refrigeration System 3 3 Heating Cooling System 3 4 DATC System 3 5 Windshield Backlight and Rear View Mirror Heaters 3 6 Task Sheets 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training WINDSHIELD BACKLIGHT AND REAR VIEW
95. arking R 12 R 134a Container fitting size 7 16 20 1 4 flare 1 2 16 ACME Chemical name Dichlorodifluoromethane Tetrafluoroethane Boiling point 29 70 C 21 62 F 25 15 C 15 07 F Latent heat of evaporation at 0 C 32 F Refrigerant Identification Tool 9 071 calories 11 843 calories or or 38 007 J 49 622 J or or 36 BTUs 47 19 BTUs A tool that identifies the type of refrigerant is available from tool manufacturer Snap On This tool verifies the refrig erant purity and identifies air diluted refrigerant problems It also analyzes and identifies R134a R12 and R22 known refrigerant blends and other hydrocarbons to protect against cross contamination problems in vehicles recovery recycling machines and storage cylinders Date of Issue 07 01 2002 Student Guide 1 3 3 CLIMATE CONTROL REFRIGERANTS REFRIGERANT EXTRACTING AND RECLAIMING MACHINE 21D S z OJP 28 72 2 0 aS FG E R OVERY Ma ECYCLING ECHARGING Il I T703 18 HEAT AND EXPANDING GAS 10 C 32 C 376 50 F 89 6 F 98 6 F Na 7 60 FULL 100 FULL BURSTING OR HIGH TEMPERATURE 7703 19 KG JAGUAR Service Training Handling refrigerant Technicians often remove or discharge ref
96. at needed to change a substance from a liquid to a vapor T703 12 NOTES 1 2 6 Student Guide Date of Issue 07 01 2002 KG JAGUAR Service Training CLIMATE CONTROL Latent heat of vaporization In an A C system latent heat of vaporization occurs within the evaporator When the refrigerant passes through the evaporator it absorbs heat from inside the vehicle and begins to boil As heat continues to be absorbed the refriger ant changes from low pressure liquid into low pressure vapor LATENT HEAT OF VAPORIZATION 100 C 100 C LATENT HEAT NT H PRODUCING 1 GRAM OF STEAM LACK OF LATENT HEAT PRODUCING 1 GRAM OF HOT WATER 993 030 J 7703 13 Latent heat of condensation In an A C system latent heat of condensation occurs within the condenser The condenser discharges heat from the refrigerant into the outside air As the refrigerant cools it condenses from a vapor to a liquid LATENT HEAT OF CONDENSATION 100 C 100 LACK OF LATENT HEAT PRODUCING 1 GRAM OF HOT WATER LATENT HEAT PRODUCING 1 GRAM OF STEAM 993 030 J 703 14 Date of Issue 07 01 2002 Student Guide 1 2 7 ae JAGUAR Service Training CLIMATE CONTROL CLIMATE CONTROL FUNDAMENTALS Heat Movement continued Pressure and Boiling Points Changing the pressure of a liquid changes its boiling point Higher pressure increases the boiling point while lower pressure decreases t
97. ation from the engine control module The LED indicates when compressor operation is requested AUTO When AUTO is selected LED on control of air distribution blower speed and interior tem perature is fully automatic Manual overrides such as pressing one of the air distribution buttons turning the blower speed control or selecting A C will disengage the automatic function The AUTO LED will go out to indicate that a manual override has been selected When AUTO is pressed again manual overrides are canceled and full automatic system con trol is restored NOTES 2 8 4 Student Guide Date of Issue 07 01 2002 XJ CLIMATE CONTROL SYSTEM JAGUAR DEF Heated windshield Heated backlight Interior temperature Manual air NOTES Service Training This switch selects defrost Maximum blower speed occurs and all air is directed to the wind shield Blower speed can be reduced by turning the blower speed control rotary switch Temperature is controlled by the A CCM however the temperature can be adjusted by using the temperature select UP DOWN switches The optional heated windshield will also be switched on for six minutes If DEF is switched off or the system is switched off before the six minutes has elapsed the heated windshield will remain on for the six minute timed peri od The LED indicates the status This switch selects the optional windshield electric heater The heater will operate for six min
98. aximum blower speed required Fresh recirc flaps positioned to recirculation DEFROST selected e AUTO full cooling required fresh recirc flaps positioned to recirculation In the heating mode blower operation is canceled by the A CCM until the engine coolant temperature reaches 30 C 86 F to prevent cold air distribution The blowers operate at all times in the cooling and defrost modes The A CCM does not monitor the blower motor circuits for diagnostics however the A CCM receives a feedback signal from the power transistor circuit that indicates blower motor speed This signal is used to adjust blower speed If a fault occurs in the blower speed feedback circuit the A CCM uses a default speed that depends on the speed selected when the fault occurred If the equivalent speed was above 7 8 bar segments the A CCM drives the blower motors at maximum speed if the equivalent speed was below 7 8 bar segments the blower motors are switched off The electrical load placed on the vehicle charging system by high speed blower operation is compensated for by the ECM engine control module NOTES 2 5 2 Student Guide Date of Issue 07 01 2002 oe XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training BLOWERS 7703 80 BLOWER COMPONENTS FAN AND MOTOR POWER TRANSISTOR 7703 81 Date of Issue 07 01 2002 Student Guide 2 5 3 x XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Tr
99. ay is located in the CJB and listed as R21 on the fuse and relay schematic NOTES 4 4 8 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM Sensors Sensor Inputs X TYPE climate control systems use five sensors as feed back to the control module Sensor Grounds All sensors have a ground connection via the control module The ground return is completed on two separate connectors The first connector is 001 Black 26 way AMP Pin 16 Wire B Evaporator and discharge sensors The second connector is P101 White 26 way Pin 17 Wire B Solar ambient and in car sensors JAGUAR Service Training Sensor Operation the sensors except the solar sensor are of the variety As the temperature rises the resistance falls and vice versa TYPICAL SENSOR T703 157 The individual reference voltage from the control mod ule to each sensor is 5v As the resistance changes from high to low so does the reference voltage at the relevant control module pin thus indicating to the control module precise tempera ture data High ohms high volts Low ohms low volts The solar sensor operates using ambient light the brighter the solar output the higher the voltage at the control module Low light low volts Bright light high volts NOTES Date of Issue 07 01 2002 Student Guide 4
100. back voltage that indi cates the position of the air flow flap The resistance range of the potentiometers is nominally 2 5 kQ Flap closed 5 10 1 volt wiper feedback voltage 7703 90 2kQ 10 4 volt wiper feedback voltage Servos and Feedback Potentiometers Diagnostic Monitoring The A CCM monitors the feedback potentiometer sensing wiper circuits for open circuit high resistance and short circuit conditions If a fault is present a DTC will be flagged In addition the A CCM monitors the time required for each servo to position its flap If the flap does not reach the required position within 30 seconds a DTC is flagged No default values are used for servo potentiometer circuit failures DTCs WDS Control Panel Component B1262 44 Defrost vent position B1268 34 Defrost feedback potentiometer B1271 34 Defrost feedback potentiometer B1263 45 Center vent position B1272 35 Center feedback potentiometer B1275 35 Center feedback potentiometer B1264 46 Footwell vent position B1276 36 Footwell feedback potentiometer B1279 36 Footwell feedback potentiometer B1265 43 Cool air bypass position B1280 33 Cool air bypass feedback potentiometer B1283 33 Cool air bypass feedback potentiometer B1266 41 Left fresh recirculation position B1287 31 Left fresh recirculation feedback potentiometer B1287 31 Left fresh recirculation feedback potentio
101. belt on the engine turns the compressor pulley which spins the compres sor when the compressor s magnetic clutch is engaged The system monitors refrigerant pressure and activates the compressor only when needed The compressor pushes vapor through the outlet to the condenser The expansion valve is like a plug in the cir cuit that allows pressure to build on the high pressure side of the system This hot high pressure vapor carries heat picked up in the evaporator as well as additional heat from the increased pressure provided by the com pressor At this point the refrigerant may be as hot as 54 C 130 F Refrigeration Cycle Condenser Hot high pressure refrigerant gas or vapor from the compressor enters the condenser under high pressure of about 1 206 kPa 175psi making the refrigerant boiling point also higher In addition the difference between the temperature of the outside air and the refrigerant is great so the refrigerant will quickly release heat to the air flowing over the surface of the condens er The hot gas at approximately 54 C 130 F quickly cools below its high boiling point As the vapor con denses to a liquid it releases large amounts of heat or latent heat of condensation Airflow across the con denser decreases when the vehicle is not moving or in stop and go traffic To compensate most A C systems include an electric fan to supply additional airflow when needed NOTES 1 6 4 Stu
102. cated at the right hand side of the lower front air intake is a thermistor which has a negative temperature coefficient NTC Ambient air temperature is determined by the by the change in the sensor resistance The A CCM applies a fixed voltage lt 5 v to the sensor and monitors the volt age across the pins to detect the varying resistance Due to the sensor location and effects of vehicle speed below 48 km h 30 mph the A CCM modifies the cal culated ambient temperature The displayed panel exterior temperature is derived from the ambient tem perature sensor signal This displayed value only matches the true exterior ambient temperature when the ignition is switched ON while the engine is cold and the vehicle is stationary 703 123 The displayed ambient temperature responds rapidly to lowering ambient temperature regardless of vehicle speed The displayed ambient temperature responds slower to increasing ambient temperature at vehicle speed greater than 48 km h 30 mph At vehicle speed 48 km h 30 mph and less the displayed ambient temperature response is slowed further If the ambient temperature sensor signal is lost the displayed temperature defaults to 10 C 50 F The A CCM uses the ambient temperature calculation for a number of control functions System control configuration to compensate for intake air temperature Panel outside air temperature displa
103. cold how does this system use the recirculation door to achieve colder cabin temperature Demonstrates Competence Instructor Signature Date 4 6 2 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM TASK SHEET 2 X TYPE TEMPERATURE SENSORS Use the Wiring Diagrams and the Student Guide to fill in the table below When the table is complete go to the assigned vehicle and locate the sensors Temperature Default Sensor Name Voltage Range COM Temperature Wiring Data Page Student Guide Demonstrates Competence Instructor Signature Date Date of Issue 07 01 2002 Student Guide 4 6 3 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training TASK SHEET 3 X TYPE AMBIENT TEMPERATURE SENSOR Using WDS Datalogger and the assigned vehicle perform the following task and record the results Materials hair dryer or heat gun 1 Run the Datalogger while observing the selections 2 Apply heat with the hair dryer or heat gun to the ambient sensor If using a heat gun use care not to melt anything 3 Record and compare the readings to the actual control panel changes Readings without heat applied Readings with heat applied Datalogger Selections 55 5 to sensor to sensor Measured external temperature Calculated external temperature Control Panel Displayed Tempera
104. ctions Demonstrates Competence Instructor Signature Date Date of Issue 07 01 2002 Student Guide 3 6 3 S TYPE CLIMATE CONTROL SYSTEM ae JAGUAR Service Training TASK SHEET 3 WDS DATALOGGER EXERCISE 1 Use the WDS Datalogger function to monitor 5 different signals from the A CCM Record the acronym description and value of each signal Acronym Description Signal 2 Identify the location of the refrigeration high side service port 3 Why must the refrigeration system be charged only through the high side service port Demonstrates Competence Instructor Signature Date 3 6 4 Student Guide Date of Issue 07 01 2002 KG JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM TASK SHEET 4 REMOVE AND INSTALL A CCM CONTROL PANEL ASSEMBLY 1 Apply the parking brake 2 Move the gear selector lever to position D 3 Close the cup holder 4 Disconnect the battery ground cable 5 Cover and protect the console and gear selector assembly INSTRUMENT PANEL T703 139 6 Carefully snap out the triangular shaped trim pieces A at each side of the control panel 7 Carefully snap out the half moon shaped trim piece B at the bottom of the control panel 8
105. dent Guide Date of Issue 07 01 2002 CLIMATE CONTROL Refrigerant Cycle Receiver drier After flowing through the receiver drier which removes moisture and contaminants the refrigerant next enters the expansion valve The expansion valve restricts the flow of refrigerant allowing only a small amount to pass through on its way to the evaporator Refrigerant pres sure on the high side of the expansion valve can be as high as 1 723 kPa 250 psi or more The expansion valve reduces that pressure to about 206 kPa 30 psi on the low side At this low pressure the temperature of the liquid refrigerant drops from about 54 C 130 F to about 1 C 30 F and its boiling point decreases As the refrigerant passes through the expansion valve it is atomized or turned into a fine liquid mist This pro cess increases the surface area of the refrigerant so it easily absorbs heat when it passes through the evaporator Refrigerant Cycle Evaporator As the refrigerant flows into the evaporator the refrig erant is a cold low pressure liquid mist At this low temperature about 1 C 30 F the refrigerant readily picks heat from the passenger compartment An elec tric blower fan pushes warm interior air over the evaporator where it gives up its heat and returns to the passenger compartment as cool air Since the refriger boiling point is lower it quickly changes into a gas allowing it to store large amounts of heat a
106. e Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training Heated Windshield If a heated windshield is fitted it can be activated manually or automatically The heated windshield is inhibited by the ECM as described on the previous page Automatic activation The heated windshield and door mirror heaters can activate automatically during certain driving conditions No LEDs illuminate when the heaters are activated automatically therefore the driver cannot easily tell when they switch on or off The windshield and door mirror heaters activate independently depending on ambient temperature and vehicle speed Automatic activation points vary slightly depending on the A CCM software Activation occurs when all of the following conditions are met Automatic heated windshield activation Ambient temperature below approximately 10 0 C 14 32 F and vehicle speed greater than 30 40 mph 48 64 km h for longer than 2 minutes The windshield switches off immediately when the conditions are no longer valid Automatic door mirror activation Ambient temperature below 0 10 32 50 F and vehicle speed greater than 30 mph 48 km h The mirrors switch off immediately if the temperature rises above the switch on point or after 2 minutes if the vehicle speed drops to below 30 mph 48 km h The A CCM does not monitor the window and mirror circuits for diagnostics NOTES Date of
107. e interior of the vehicle HVAC systems are rated in calories Vehicle designers must take into account the size of the vehicle number of passengers and possible sources of heat when designing a HVAC system T703 07 Metric to English conversion table Metric English 1 gram 0 0022 pound 251 cal 1 BTU 1 055 1 BTU 17 C 62 6 F 18 C 64 4 F NOTES Date of Issue 07 01 2002 Student Guide 1 2 3 KG JAGUAR Service Training CLIMATE CONTROL CLIMATE CONTROL FUNDAMENTALS Humidity Humidity is the amount of water or water vapor in the air The humidity of the air may vary from a dry 0 up to a very damp 100 Humid cold air feels much colder than air that is dry and at the same temperature Humid hot air slows down the human body s ability to cool itself by evaporation and perspiration As with temperature excessive humidity makes humans uncomfortable Excessive humidity also puts added strain on the air conditioning system car s air conditioner not only cools the interior of the vehicle it also removes the moisture from the air flowing into the passenger compartment as the air conditioning system operates Heat Movement HVAC systems can transfer heat out of a place where it is not wanted and move the heat into a place where it is wanted Several physical principles are involved in this transfer of heat Heat is energy that moves from hot to cold Cold is a lack of e
108. eed control in automatic mode 12 Which of the following sensors are not used on an X TYPE ___ Solar sensor _ B Ambient sensor ____ C Heater matrix sensor D In car temperature sensor E Air discharge temperature sensor 13 Concerning a replacement compressor on a 2000 MY Jaguar Technician A states that one should always add 4 ounces of fresh oil to the system Technician B states that additional oil is not necessary Who is correct A Technician A only B Technician B only C Neither technician A or B D Technician A and B are both correct 14 Concerning an expansion valve system Technician A states that the refrigerant leaving the receiver drier is low temperature low pressure liquid Technician B states the refrigerant leaving the receiver drier is low pressure low temperature gas vapor Who is correct A Technician A only B Technician B only C Technician A and B are both correct D Neither technician A or B 15 Concerning an orifice tube system Technician A states that the refrigerant leaving the accumulator is a low temperature low pressure vapor Technician B states that the refrigerant leaving the accumulator is a low pressure low temperature liquid Who is correct A Technician A only B Technician B only C Technician A and B are both correct D Neither technician A or B Date of Issue 07 01 2002 Student Guide 3 JAGUAR CLIMATE CONTROL SYSTEMS JAGUAR Service Training
109. efrigerant pressure must be between 2 30 bar 29 435 psi for the switch contacts to remain closed and pro vide a signal to the A CCM allowing the A C request signal to the ECM AJV8 REFRIGERANT PRESSURE SWITCH UB BK BK lt gt 20 BAR m WU BK m BK BK Ge REFRIGERANT 4 WAY PRESSURE SWITCH 703 64 Refrigerant Pressure Switch Diagnostic Monitoring The A CCM monitors pressure switch operation by comparing the ambient temperature to the switch contact posi tion During normal ambient temperature conditions the switch contacts should be closed If the switch circuit is open during normal conditions DTC B1858 is flagged At ambient temperatures below 10 C 14 F refrigerant pressure should drop below 2 bar 29 psi and open the switch contacts If the contacts are closed or there is a short circuit to ground DTC B1861 is flagged No default val ue is used for this signal DTCs WDS Control Panel Condition B1858 23 Open circuit B1861 23 Closed circuit NOTES Date of Issue 07 01 2002 Student Guide 2 2 13 ae JAGUAR Service Training XJ XX CLIMATE CONTROL SYSTEM AIR CONDITIONING REFRIGERATION SYSTEM Evaporator Temperature Sensor The evaporator temperature sensor located on the left side of the evaporator is an NTC negative temperature coef ficient sensor that provides a voltage signal to the A CCM
110. f heat transfer Convection occurs when material such as an engine passes heat to HEAT FROM THE the cooling system of the vehicle As the potential energy ENE of the fuel is converted to mechanical and heat energy by the engine combustion process the heat of the engine must be removed The liquid in the cooling system is pumped through the engine and the convection process transfers engine heat to the liquid The cooling system liquid then takes this heated coolant to the radiator The metal radiator uses the conduction process to remove the heat from the liquid coolant and to the radiator fins The radiator fins then pass the heat of the radiator to the passing airflow through the radiator HEATER CORE T703 11 RADIATION Heat Radiation Radiation is another example of how heat can move Radiation occurs when heat rays pass from one loca tion to another without warming the air or material that the rays are passing through An example of radiation is a vehicle on a cold sunny day If the vehicle s interior is closed off from the outside air temperature the interior of the vehicle becomes warmer than the outside air This happens because the sunlight is passing through the air and light rays are striking the exterior and interi or of the vehicle When the light rays strike the interior and exterior of the vehicle surface the light energy is changed into heat energy warming the vehicle The cold o
111. fter use and never reuse oil removed from an operating A C system In an A C system the components hold the refrigerant oil The compressor helps to mix the oil with the refrigerant and circulates it throughout the system When replacing an A C component the oil that is trapped in the compo nent that is being replaced must also be replaced Service manuals contain charts describing how much oil to add for various component replacements If an A C system develops a leak refrigeration oil will appear at the site of the leak Any leaking refrigerant evapo rates immediately The amount of oil lost depends on the size of the leak and the length of time it was leaking After you repair a leak replace the amount of lost oil Carefully measure the oil removed during evacuation and replace it with a slightly greater amounit If lost oil is not replenished severe damage may occur NOTES 1 5 2 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Components 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002
112. h cycle Discharge Air Temperature The A CCM attempts to provide both the driver and the passenger with their selected air temperature If both of the selected temperatures cannot be achieved the system is biased in favor of the driver The rear seat passengers receive the air temperature selected for the person seated directly in front Fan speed and air distribution are cen trally controlled Pressing and holding the AUTO button for two seconds equalizes the driver and passenger temperature selections A feature unique to V8 vehicles allows interior heating to be continued after the engine has been switched off With the ignition switch in position Il the climate control system will continue to provide interior heating until the engine cools to a predetermined level maximum 20 minutes NOTES 3 4 8 Student Guide Date of Issue 07 01 2002 S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training DATC SYSTEM LOGIC DATC AIR CONDITIONING CONTROL MODULE BATTERY POWER IGNITION SWITCHED POWER DRIVER CONTROL SELECTION 3 gt DRIVER TEMPERATURE SELECTION CONTROL PASSENGER TEMPERATURE SELECTION AMBIENT TEMPERATURE IN CAR TEMPERATURE 3 EVAPORATOR DISCHARGE AIR TEMPERATURE DRIVER DISCHARGE AIR TEMPERATURE PASSENGER DISCHARGE AIR TEMPERATURE LH SOLAR LOAD RH SOLAR LOAD 39 DATC CONTROL S
113. h the A CCM By monitoring the ground voltage the A CCM can detect when a pump motor fail ure has occurred pump locked or ground circuit open Vehicles from VIN 739426 use a lower current draw motor and no A CCM diagnostic monitoring The pump motor ground circuit is completed directly to ground DTCs WDS Control Panel B1968 None NOTES JAGUAR Service Training HEATER PUMP AND VALVE HEATER VALVE HEATER PUMP T703 71 HEATER COOLANT FLOW HEATER VALVE HEATER MATRIX T703 72 Date of Issue 07 01 2002 Student Guide 15 AJ16 V12 CLIMATE CONTROL SYSTEM LOGIC JAGUAR Service Training AJ16 AND V12 CONTROL MODULE INPUTS OUTPUTS XJ6 1995 97 MY nea CONTROL PANEL O SERIAL COMMUNICATIONS DATA LIN OUTSIDE TEMPERATURE AMBIENT TEMPERATURE SENSOR SOLAR LOAD SOLAR SENSOR IN CAR TEMPERATURE IN CAR TEMPERATURE SENSOR EVAPORATOR TEMP EVAPORATOR TEMPERATURE SENSOR HEATER MATRIX TEMP HEATER MATRIX TEMPERATURE SENSOR INSTRUMENT PACK ENGINE TEMPERATURE VEHICLE SPEED COMPRESSOR ON OFF REFRIGERANT PRESSURE SWITCH WINDSHIELD HEATERS HEATER ON OFF lt HEATER ON OFF WINDSHIELD HEATER RELAYS HEATED BACKLIGHT REAR WINDOW HEATER HEATERS ON OFF lt MIRROR HEATER
114. he AUTO and FRESH RECIRC buttons simultaneously while switching the ignition to position II All of the panel LEDs and all LCD segments will flash ON and OFF Any function LED indicator or LCD segment that does not flash suggests a fault condition within that area of the panel or with the LED or LCD Press AUTO The control panel display will flash and scroll through the list of flagged fault codes A maximum of five codes will be stored and displayed If O is displayed no fault codes are flagged Press FACE to manually scroll through the fault codes When a fault code is displayed an accompanying beep will indicate if the fault is present If the code is not accompanied by a beep the fault occurred previously NOTE Faults that are present can not be cleared until the cause of the fault is repaired To clear fault codes press HRW and FACE simultaneously Wait 30 seconds for the A CCM to retest the system and reflag any current faults e Press PUSH OFF to return the system to normal operation default panel settings Panel Communication Check The data link power and lighting circuits between the A CCM and the control panel can be checked by simulta neously holding AUTO and FAN while the ignition is switched to position Il Panel control LEDs will illuminate to indicate that each circuit is OK as follows Circuit LED Ignition switched power supply pos Il circuit Defrost button LED
115. he boiling point An air conditioning system also uses this principle to remove heat from the interior of the vehicle At sea level water boils at 100 C 212 F The lower atmospheric pressure at the top of a high mountain may allow water to boil at only 86 C 187 F Refrigerants must have very low boiling point Some refrigerants under pressure in an air conditioning system may have boiling points as low as 22 C 7 6 F NOTES 1 2 8 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 1 1 Climate Control Overview 1 2 Climate Control Fundamentals 1 3 Refrigerants 1 4 Refrigeration System Components 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 KG CLIMATE CONTROL JAGUAR Service Training REFRIGERANTS R 12 Automotive air conditioning systems typically use one ENE ATOMS type of refrigerant R 134a Older vehicles used a refrig erant called R 12 but this type of refrigerant is no longer in production The R stands for refrigerant Both chemicals are suitable A C refrigerants because they have very low boiling points Though similar in many respects R 12 and R 143
116. he power steering pump and air conditioning compressor are driven by the same belt a compressor lock sensor is installed to provide the A CCM with an input to verify correct operation The compressor lock sensor similar to an ABS wheel speed sensor provides a pulsed signal indicating compressor pulley speed The A CCM compares the pulley speed to the engine speed input received from the ECM If the pulley speed indi cates belt slippage the A CCM cancels the A C request to the ECM to protect against drive belt failure The A CCM also flashes the control panel A C switch LED as an immediate warning and flags DTC B1862 The compressor lock sensor is deleted on AJV8 applica tions after the 1997 MY The A CCM monitors the compressor lock sensing circuit for open circuit and short circuit conditions If a fault is present a DTC will be flagged No default value is used for this signal DTCs WDS Control Panel B1862 22 NOTES 2 2 12 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training XJ XK CLIMATE CONTROL SYSTEM Refrigerant Pressure Switches A single 4 way pressure switch is located on the high pressure line between the compressor and condenser to moni tor refrigerant pressure The three contact sets in the switch work with the A CCM and ECM to control compressor clutch engagement and radiator cooling fan speed Refer to AJV8 Cooling Fan Control page 2 3 4 The r
117. ide is used to increase coolant flow to the heater core as necessary The A CCM con trols pump operation via a relay located in the front power distribution box The A CCM operates the V8 auxiliary coolant pump as follows Pump ON when selected temperature control panel is moderate to high Pump OFF when selected temperature control panel is low One minute pump ON delay after engine start 2e Pump ON with radiator cooling fan drive ON after gt 7 S ignition OFF engine hot LY a FA 703 113 NOTES 3 3 4 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 3 1 Overview 3 2 Refrigeration System 3 3 Heating Cooling System 3 4 System 3 5 Windshield Backlight and Rear View Mirror Heaters 3 6 Task Sheets 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 x JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM 3 4 2 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM The Dual Automatic Temperature Control DATC climate control system is a compact system that provides a com plete
118. ignal representing the heater matrix outlet air temperature The heater matrix air temperature is one of the inputs used by the A CCM to control the operation of the heater valve Approximate Air Temperature Versus Voltage HEATER MATRIX SENSOR Temperature Voltage C F 67 73 152 163 0 75 57 64 50 56 43 48 37 42 32 36 27 31 23 26 18 22 14 17 10 13 50 56 3 25 1703 76 Heater Matrix Sensor Diagnostic Monitoring The A CCM monitors the heater matrix sensing circuit for open circuit high resistance and short circuit conditions If a fault is present a DTC will be flagged A default value of 45 C 113 F is substituted by the A CCM if a heater matrix air temperature sensor fault is present DTCs WDS Control Panel B1966 15 B1967 15 NOTES Date of Issue 07 01 2002 Student Guide 2 4 5 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 4 6 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Component Location 2 8 Control Module 2 9 Climate Control Panel 2 10 Temperature Control Sensors 2 11 Vehicle Systems
119. ine cooling fans to operate Who is correct A Technician A only B Technician B only C Technician A and B are both correct _ D Neither technician A or B 8 The Cool air bypass servo on an S TYPE has failed open circuit Which DTC will be stored ___ A 1262 ___ B B1318 B1342 _ D B1265 9 What would the customer complaint be if the blower sense wire were open circuit on 2001 X TYPE ____ A Lack of heating ____ Insufficient cooling C Control panel flashes ER when the vehicle is first started D In sufficient cooling in automatic mode only 2 Student Guide Date of Issue 07 01 2002 JAGUAR CLIMATE CONTROL SYSTEMS JAGUAR Service Training 10 When using WDS data logger to monitor the RECIRCULATION motor on a 2002 X TYPE the digital dis play reading is 3 This indicates ____ A The motor is in the process of moving the flap ____ The motor has stopped moving the flap C The flap is closed D The flap motor has a fault this is a DTC 11 Which of the following is true concerning an X TYPE climate control system ____ A The HSLP high side low pressure switch is used to protect the compressor from low pressure B The pressure transducer is used to protect the system from high pressure above 30 Bar 441 PSI C The orifice tube cannot be serviced separately from the evaporator jumper pipe D The heater matrix sensor input is used for blower sp
120. ing Air Discharge Sensor AIR DISCHARGE SENSOR The air discharge sensor is placed in the air stream from the air temperature blend flap Air flowing into the cabin is checked against what the driver has requested and against what the in car tem perature sensor is reading The sensor is in fact the same unit as the evaporator sensor However it is not coated and would not stand up to the moist environment if placed in the evapora tor position Should the driver change the temperature demand set ting higher or lower then the blend flap will move to allow more evaporator air or more heater matrix air through the required distribution flap If the requested temperature demand is set to Hi or Lo then the air dis charge sensor enters an open loop condition the result is that the sensor signal is then disregarded T703 161 Sensor Resistance Temperature C Ambient Discharge Evaporator In Car 20 276959 96358 96358 95890 15 209816 72500 72500 72220 10 160312 55046 55046 54890 5 123485 42157 42157 42070 0 95851 32554 32554 32500 5 74914 26339 26339 25310 10 58987 19872 19872 19860 15 46774 15698 15698 12690 20 37340 12488 12488 12490 25 30000 10000 10000 10000 30 24253 8059 8059 8060 35 19716 6535 6535 6536 40 16113 5330 5330 5331 45 13236 4372 4372 4372 50 10926 3605 3605 3606 Date of Issue 07 01 2002 Student Guide 4 4 13
121. ircuit for diagnostics NOTES 2 10 4 Student Guide Date of Issue 07 01 2002 XJ CLIMATE CONTROL SYSTEM JAGUAR Service Training Engine Coolant Temperature The A CCM receives an engine coolant temperature voltage signal from the instrument pack Heating Mode When the system is the heating mode and the engine coolant temperature is below 30 C 86 P the inhibits operation of the heater valve heater pump and the blowers Once the coolant temperature has risen above this temperature the heater pump and valve operation returns to normal the blower speed will be lower than selected until the coolant temperature reaches 60 C 140 F Coolant Temperature Diagnostic Monitoring The A CCM monitors the engine coolant temperature circuit for open circuit high resistance and short circuit condi tions If a fault is present a DTC will be flagged If a circuit fault occurs between the coolant temperature sensor and the instrument pack the instrument pack out put will default to a voltage equal to 20 C 68 F If a circuit fault occurs between the instrument pack and the A CCM the A CCM will substitute a default value of 76 C 169 F DTCs WDS Control Panel B1948 14 B1949 14 Vehicle Speed The A CCM receives a pulsed signal from the instrument pack to indicate vehicle speed The instrument pack receives its signal from the ABS control module The A CCM uses the
122. is operated A CCM Memory The A CCM stores all panel settings and flagged DTCs in volatile memory If the vehicle battery is disconnected or B power is interrupted by fuse removal or disconnection all panel settings and flagged DTCs will be lost After B reconnec tion the panel will be set to OFF When next switched ON the panel will assume an average automatic setting 24 C 75 F If appropriate the customer s settings should be recorded before power disconnection and reset before the vehicle is returned to service NOTES 3 4 6 Student Guide Date of Issue 07 01 2002 KG S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training A CCM Replacement After installation all replacement A CCMs must be programmed using WDS before they are put into service The absence of the audible chime when the control panel buttons are pressed will alert the technician that the A CCM requires programming The programmable attributes are Heated windshield Heated wiper park A CCM CONTROL PANEL AIR CONDITIONING CONTROL MODULE F C SELECT DEFROST MODE DISPLAY EXTERIOR TEMPERATURE MANURE AI MANUAL FAN SPEED DRIVER LHD PASSENGER RHD TEMPERATURE RECIRCIRCULATE PASSENGER LHD DRIVER RHD TEMPERATURE HEATED BACKLIGHT AND MANUAL AIR DISTRIBUTION MIRROR HEATERS HEATED WINDSHIELD OR HEATED WIPER PARK AU
123. itioning Heater Unit 2 6 System Logic 2 7 Component Location 2 8 Control Module 2 9 Climate Control Panel 2 10 Temperature Control Sensors 2 11 Vehicle Systems Interfaces 2 12 Control Panel Diagnostics 2 13 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training COOLING FAN CONTROL Cooling Fan Control The radiator condenser cooling fans are controlled by the ECM via the fan control relay module using inputs from the engine coolant temperature sensor ECT and the 4 way refrigerant pressure switch 12 bar 174 psi and 20 bar 290 psi switch elements At lower coolant temperatures refrigerant pressures the fans operate at low speed series At high coolant temperatures refrigerant pressures the fans operate at high speed parallel As the ECM switches the fan speeds overlap between switch on switch off points prevents hunting between the fan modes XJ Radiator Fan Switching Points Engine coolant temperature Refrigerant pressure Fan Speed ON OFF ON OFF Low 90 C 194 F 86 C 187 F 12 bar 174 psi 8 bar 116 psi Fast 97 5 C 207 5 F 93 5 C 200 5 F 22 bar 319 psi 17 5 bar 254 psi XK Radiator Fan Switching Points Engine coolant temperature Refrigerant pressure Fan Speed O
124. its pressure drops and it enters the low pressure side The low pres sure side extends through the evaporator and into the compressor s inlet The vertical line in the illustration marks the points where the refrigerant changes state On the left side of the cir cuit the refrigerant is a vapor on the right side it is a liquid NOTES Date of Issue 07 01 2002 Student Guide 1 6 3 CLIMATE CONTROL REFRIGERATION CYCLES Refrigeration Cycle in an Expansion Valve System continued RECEIVER REFRIGERATION FLOW HEAT TO DRIER CONDENSER ATMOSPHERE EB COMPRESSOR I NEC EXPANSION EVAPORATOR VALVE EAT FROM VEHICLE INTERIOR T703 33 REFRIGERATION FLOW RECEIVER HEAT TO DRIER ATMOSPHERE CONDENSER _ COMPRESSOR EVAPORATOR BEP gt PN HEAT FROM VEHICLE INTERIOR EXPANSION VALVE T703 34 ae JAGUAR Service Training Refrigeration Cycle Compressor refrigeration cycle begins at the compressor The compressor draws in low pressure vapor about 206 kPa 30 psi from the evaporator and compresses it to about 1 207 kPa 175 psi A drive
125. l type A C compressor replaces the previous swash plate type compressor NOTES Date of Issue 07 01 2002 Student Guide 3 4 3 x S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training DATC SYSTEM System Components e Temperature sensors Ambient air temperature sensor In car air temperature sensor Evaporator discharge air temperature LH discharge air temperature discharge air temperature Blower and blower motor controller Evaporator heater assembly e Airflow distribution flaps and actuators Cold air bypass Fresh recirculation Defrost Panel Hoor e Dual coolant control valve Auxiliary coolant pump V8 Air intake screen and filter Air conditioning refrigeration system Scrolltype compressor pressure sensor Engine cooling system Windshield and mirror heaters 3 4 4 Student Guide Date of Issue 07 01 2002 S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training DATC SYSTEM COMPONENTS LHD SHOWN BLOWER MOTOR EVAPORATOR DISCHARGE FRESH J RECIRCULATION CONTROLLER COLD AIR BYPASS AIR TEMPERATURE SENSOR ACTUATOR BS T 7 I i GE AIR CONDITIONING CONTRO
126. meter B1267 42 Right fresh recirculation position B1288 32 Right fresh recirculation feedback potentiometer B1291 32 Right fresh recirculation feedback potentiometer 2 5 10 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Component Location 2 8 Control Module 2 9 Climate Control Panel 2 10 Temperature Control Sensors 2 11 Vehicle Systems Interfaces 2 12 Control Panel Diagnostics 2 13 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM SYSTEM LOGIC JAGUAR Service Training AJV8 CONTROL MODULE INPUTS OUTPUTS XJ XK 1997 MY ON CONTROL PANEL ER COMMUNICATIONS DATA LINK OUTSIDE TEMPERATURE AMBIENT TEMPERATURE SENSOR SOLAR LOAD SOLAR SENSOR IN CAR TEMPERATURE IN CAR TEMPERATURE SENSOR EVAPORATOR TEMP EVAPORATOR TEMPERATURE SENSOR HEATER MATRIX HEATER MATRIX TEMPERATURE SENSOR INSTRUMENT PACK ENGINE TEMPERATURE VEHICLE SPEED SYSTEM ENGINE SPEED CONTROL WINDSHIE
127. motors are mounted on an adjustable adaptor plate do not disturb the setting Should there be a need to remove the adaptor plate mark its position Adaptor plate misalignment can cause a strain on the stepper motor drive gear Moisture Purge To combat the fact that moisture is present in the evaporator matrix area a number of innovations have been designed into the system to prevent windshield fogging and odors from the A C system The doors except the heater matrix are made from plastic and are foamless this prevents moisture being stored by the foam which assists in reducing the chance of odors being generated The climate control system calculates the accumulative amount of time the A C system has been engaged If this time exceeds a period of one minute at 15 20 C then the system qualifies for ignition on moisture purge At the next ignition on signal the defrost door is closed and the foot door is opened air is blown through to the foot wells at 30 blower speed for 30 seconds All positions will purge except the defrost position which can purge through panel face vent if required NOTES 4 4 16 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Blower Motors BLOWER PWMI DRIVE SIGNAL Blower motors are always located on the passenger side of the vehicle The blower motor 12v supply is fed from the blower relay labeled
128. nal addition If heated windshield is not ordered the heated rear window button is double in size Occupant temperature control 360 manual control over the blowers available using an eleven step motor which is PWM driven by the CM Fresh recirculation operation governed by various sensors such as the ambient sensor therefore pre defined time is quoted for the duration of operation If you press and hold the recirculation button for longer than two seconds the recirculation flap is latched latched operation is confirmed by a double beep Permanent display of external temperature The ambient sensor must be in the air stream to operate effec tively that is not blocked off by any aftermarket accessories Ambient Sensor Logic The logic is similar to that of previous Jaguar climate control systems and follows the strategy as follows the vehicle has cooled down since the ignition was on last then the digital display reading is updated imme diately on the next ignition cycle Should the ambient sensor detect a temperature rise on the next ignition on cycle indicating a possible heat soak condition then the system must be driven at 35 km h 22 mph and above for 30 seconds before a stabi lized reading will be shown NOTES Date of Issue 07 01 2002 Student Guide 4 4 3 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training EATC SYSTEM EATC Control System continued Navigation Con
129. nergy The rate that heat moves is a factor of the differ ence in the temperature between hot and cold areas A large temperature difference moves heat much faster than if two areas are almost the same temperature The heat flow tends to make the hot item cooler and the cooler item warmer lf left alone the two areas will become the same temperature To cool a hot vehicle the evaporator creates a cold place inside the vehicle for the unwanted heat to transfer to Once the heat moves to this cool area the heat is then removed and transferred to the air outside of the vehicle The vehicle s engine and HVAC make this a fairly simple process Heat can travel on one or more of three paths conduction convection and radiation Heat Conduction CONDUCTION Conduction is the simplest way heat travels An exam HEAT TRAVELING FROM CENTER TO ENDS ple of conduction would be heating one end of a metal METAL ROD wire Heat applied to one end of the wire would be con ducted through the wire to the opposite end until both ends of the wire become hot Some materials such as steel copper and aluminum are good heat conductors Materials such as wood or plastic are poor conductors of heat and are called insulators CO METAL END NOTES Y HEAT SOURCE T703 10 1 2 4 Student Guide Date of Issue 07 01 2002 CLIMATE CONTROL JAGUAR Service Training Heat Convection CONVECTION Convection is another type o
130. ng a rising temperature signal is ignored by the A CCM at vehi cle speeds below 9 mph 15 km h Falling temperature signals are always used by the A CCM AMBIENT TEMPERATURE SENSOR Approx Ambient Temperature Versus Voltage Temperature Voltage 44 49 111 121 1 25 1 50 1 75 2 00 2 25 2 50 2 75 3 00 3 25 3 50 3 75 T703 103 Ambient Temperature Diagnostic Monitoring The A CCM monitors the ambient temperature sensing circuit for open circuit high resistance and short circuit con ditions If a fault is present a DTC will be flagged A default value of 10 C 50 F is substituted by the A CCM if an ambient temperature sensor fault is present DTCs WDS Control Panel B1254 12 B1257 12 NOTES 2 9 4 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training Solar Sensor SOLAR SENSOR The light sensitive solar sensor located at the top of the fascia panel provides the A CCM with a voltage signal representing the solar sun load being placed on the vehicle The sensor uses a light sensitive diode so that as the brightness of the sun brightness increases the sen sor voltage signal to the A CCM increases The range of the sensor is 0 75 4 75 volts Solar Load Diagnostic Monitoring The A CCM monitors the solar sensor circuit for open circuit high resistance and short circ
131. noise when a mobile phone is used or a conversation is taking place in the vehicle If the system is fitted with a fixed phone the Mute facility will automatically engage when the phone is being used and will revert back to the previous condition upon call termination Keys Available Climate Control Hard Keys Climate Control Soft Keys Climate menu Manual fan speed indicator chaplets Blower speed control e Manual air distribution selection A C ON OFF System ON OFF Temperature demand External temperature scales C and F Heated rear window R air mode Heated windshield F optional fitment Mute feature Defrost Recirculation Auto mode NOTES Date of Issue 07 01 2002 Student Guide 4 4 5 JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM EATC SYSTEM Components EATC SYSTEM COMPONENTS Co 65 TELEMATICS DISPLAY MODULE ENGINE CONTROL MODULE DISCHARGE AND EVAPORATOR TELEMATICS DISPLAY MODULE TEMPERATURE SENSORS OPTION FACE FLOOR DEFROST AND TEMPERATURE BLEND MOTORS AMBIENT TEMPERATURE SENSOR HEATED WINDSHIELD WHERE FITTED TR TEUER EA EE s SOLAR SENSOR HEATED DOOR MIRRORS AND HEATED REAR WINDOW A CCM REMOTE OR COMBINED T703 156 4 4 6 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM
132. nt con trol valve Control of this valve allows the system to provide individual discharge air temperature to the driver and front passenger If the A CCM loses discharge air temperature signal a default value of 24 C 75 F is substituted PLENUM ASSEMBLY LH DISCHARGE AIR TEMPERATURE SENSOR INSIDE RH DISCHARGE AIR TEMPERATURE SENSOR INSIDE 703 128 NOTES Date of Issue 07 01 2002 Student Guide 3 4 17 KG JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM System Details continued PLENUM ASSEMBLY Flap Actuators There are five flap actuators which are positioned by DEFROST the A CCM to achieve the desired discharge air flow for ACTUATOR the selected DATC operating mode The actuators have flap positioning motors driven by the A CCM with inte gral position feedback potentiometers The A CCM uses the position feedback potentiometer signal to calculate actual flap position The flaps move between open and close in approximately 5 to 6 seconds Two minutes after the ignition is switched off the flaps are moved to their parked positions LS b COLD AIR BYPASS ACTUATOR TD PANEL ACTUATOR FLOO ACTUATOR 703 129 FRESH RECIRCULATION ACTUATOR T703 131
133. ockage or high ambient temperature On AJ16 the pressure switch is part of the triple pressure switch Refrigerant pressure must be between 2 27 bar 29 392 psi for the switch contacts to remain closed and provide a ground signal to the A CCM The radiator cool ing fans are switched from low to high speed by the other set of contacts in the triple pressure switch The refrigerant pressure switch es are located close to the engine bulkhead on the right side AJ16 REFRIGERANT PRESSURE SWITCHES 1995 97 MY BK m B m m WU B m B REFRIGERANT B TRIPLE PRESSURE SWITCH 4 T703 62 V12 REFRIGERANT PRESSURE SWITCHES 1995 97 MY m UB BK 2 B REFRIGERANT DUAL PRESSURE SWITCH T703 63 Date of Issue 07 01 2002 Student Guide 11 ae AJ16 V12 CLIMATE CONTROL JAGUAR Service Training COOLING FAN CONTROL Cooling Fan Control AJ16 The radiator and condenser cooling fans are controlled by both radiator coolant temperature and air conditioning refrigerant pressure Fan operation depends on the cooling air flow requirement At lower coolant temperature refrigerant pressure both fans operate at low speed in series at high coolant temperature refrigerant pressure both fans operate at high speed in parallel The refrigerant triple pressure switch contains a pressure contact set for high speed fan drive A separate refrigerant single pressure switch is
134. ompetence Instructor Signature Date Date of Issue 07 01 2002 Student Guide 3 6 7 ae S TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training TASK SHEET 7 S TYPE AMBIENT TEMPERATURE SENSOR Using WDS Datalogger and the assigned vehicle perform the following task and record the results Materials S TYPE hair dryer or heat gun 1 Run the Datalogger while observing the selections 2 Apply heat with the hair dryer or heat gun to the ambient sensor If using a heat gun use care not to melt anything 3 Record and compare the readings to the actual control panel changes Readings without heat applied Readings with heat applied Datalogger Selections 55 5 to sensor to sensor External temperature sensor Unfiltered data 2 External temperature sensor Filtered data 2 Control Panel Displayed Temperature Which reading matches the control panel displayed temperature How is the ambient temperature calculated in relation to wheel speed Why Under what driving conditions will the ambient temperature displayed not match the actual outside temperature Demonstrates Competence Instructor Signature Date 3 6 8 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training S TYPE CLIMATE CONTROL SYSTEM TASK SHEET 8 S TYPE COOLANT CONTROL VALVE Use WDS to complete this Task Sheet 1 From the Content Model screen open Climate
135. on Exhaust Gas Temperature Sensor Engine Oil Temperature Sensor Evaporative Emission Canister Close Valve Evaporative Emission Canister Purge Valve Fuel Tank Pressure Sensor General Electronic Control Module Global Positioning System High Intensity Discharge Heated Oxygen Sensor RH Bank Upstream Heated Oxygen Sensor RH Bank Downstream Heated Oxygen Sensor LH Bank Upstream Heated Oxygen Sensor LH Bank Downstream Intake Air Temperature Sensor Instrument Cluster In Car Entertainment System Intake Manifold Tuning Valve Top Intake Manifold Tuning Valve Bottom Injection Pressure Sensor Knock Sensor RH Bank Knock Sensor LH Bank Left Hand Left Hand Drive Mass Air Flow Sensor Manual Transmission Manifold Absolute Pressure Sensor Normally Aspirated North American Specification Negative Temperature Coefficient Organic Acid Technology Passive Anti Theft System Powertrain Control Module ii Student Guide Date of Issue 07 01 2002 JAGUAR CLIMATE CONTROL SYSTEMS PTEC PWM RECM RH RHD ROW SCP TCM TP SENSOR TP1 TP2 TURN TV V6 V8 VICS VVT VALVE 1 VVT VALVE 2 ve ve aoe JAGUAR Service Training Powertrain Electronic Control Pulse Width Modulated Rear Electronic Control Module Right Hand Right Hand Drive Rest of World Standard Corporate Protocol Network Transmission Control Module Throttle Position Sensor Throttle Position Sensor Element
136. on the reservoir Always fill the reservoir at ambient temperature to the maximum fill RESERVOIR s level to ensure the maximum fill volume possible NOTES T703 152 4 3 6 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Coolant Filling Procedure The system fill is 8 25 liters of 50 50 5 with organic acid technology coolant distilled water mix This sys tem fill is common with the S TYPE that is it utilizes the orange Extended Life antifreeze five years or 156 000 miles 250 000 km 1 Fill with coolant when the engine is cold 2 Ensure that the thermostat is closed 3 Add the 50 50 OAT distilled water mix until it reaches the maximum level indicator on the reservoir approximately 4 liters for a radiator change 4 Ensure that the 50 50 mix is achieved for correct cooling efficiency Too much antifreeze reduces cooling capacity while too little results in freezing problems 5 Allow around two minutes to fill the cooling system Do not try to rush the procedure completing the fill slowly will avoid the creation of air locks 6 Run the engine at idle for ten minutes The level will drop to below the maximum level shown on the res ervoir 7 Switch off the engine and allow the system to cool down to the ambient temperature in order to achieve maximum coolant volume 8 Itis important to top up the s
137. onents 1 5 Lubricants 1 6 Refrigeration Cycles 1 7 Heating System 1 8 Air Ventilation System 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 CLIMATE CONTROL CLIMATE CONTROL FUNDAMENTALS Heat Energy KG JAGUAR Service Training Air conditioning is the control of heat Heat is a form of energy Energy cannot be destroyed but can be converted into another form of energy Air conditioning systems use heat and energy from the vehicle s engine to remove unwanted heat from the interior of the vehicle An example of energy conversion is a flame under a container of water The heat from the flame raises the tempera ture of the water causing the water to boil The expanding gases or steam from the boiling water can be used to create mechanical motion another form of energy Along with the concept of heat and heat energy comes the concept of cold HEAT MOVEMENT PAN b HANDLE HEAT SOURCE T703 05 WATER BOILING POINT WATER FREEZING POINT 2 e p 2685 2 NS gt 55435 5 1o 09 Ed a F 284 266 248 230 212 194 176 158 140 122 104 86 HUMAN lt COMFORT Z
138. ontrol system for faults If a fault is detected the A CCM flags a diag nostic trouble code DTC corresponding to the fault All DTCs can be retrieved using WDS In addition some fault codes can be displayed on the control panel screen The WDS DTCs consist of 5 characters the codes displayed on the control panel are two digit numbers WDS and panel display fault code information is supplied with the descrip tion of the applicable component in this textbook A CCM Power Supplies and Auxiliary Ground Diagnostic Monitoring The A CCM monitors the system power supplies for open circuit high resistance and short circuit conditions The ignition switched ground input signal is monitored for open circuit or high resistance conditions If a fault is present a DTC will be flagged DTCs WDS Control Panel B1292 None B1294 None B1355 None B1857 None AIR CONDITIONING CONTROL MODULE 7JJecoooot4f12 Joooooof6 XJ CC31 AC4 XJ CC30 9 1 Fm mm rm am Fa Fm XJ 29 AC2 14 26 1 13 XJ 28 AC1 T703 98 NOTES 2 7 4 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Ref
139. orator carrying the heat with the refriger ant as a warm low pressure gas NOTES 1 4 2 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training CLIMATE CONTROL Compressor The compressor is the refrigerant pump for the A C sys tem A drive belt and pulley connect the compressor to the engine crankshaft which provides the power to operate the compressor The compressor draws in Aten warm low pressure gas from the evaporator which XY drastically raises the pressure and temperature of the gas The gas is passed on to the condenser The com pressor operates only with refrigerant in its gaseous state Liquid refrigerant in the compressor will damage the compressor Compressors create suction and pres sure Pistons or other forms of internal compressor components create pressure and suction moving the refrigerant COMPRESSOR PISTON r DISCHARGE The suction port allows the compressor to draw in gas VALVE from the evaporator The compressor then compresses the gas and discharges the gas out of the discharge port SUCTION to the refrigeration lines and to the condenser RELIEF VALVE The clutch assembly allows the compressor to cycle on and off using the HVAC electrical controls DISCHARGE The relief valve protects the system from excessive refrigerant pressures If system pressure becomes too high the valve opens and refrigerant is vented to the outside air PULLEY CLUTCH
140. peed chaplets and axis line Recirculation operation symbol Selected temperature demand Auto symbol Air distribution symbol The EATC panel can have up to a total of fourteen push buttons The system On Off button is combined with a rota ry control for manual blower speed operation EATC CONTROL INTERFACE PANEL NON TELEMATICS os T703 154 Push Button Features Fresh Recirculation Temperature demand control Cor F scale Heated rear window R heated door mirrors A C On Off switch Heated windshield F optional fitment Auto mode Defrost control Air distribution mode four buttons System On Off rotary control switch 4 4 2 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training System Operation The EATC system maintains the interior of the vehicle at the temperature selected by occupant The heat input air conditioning fan speed and air intake and distribution are adjusted automatically to maintain the desired set tem perature Automatic control AUTO may be overridden at any time by the use of the various control buttons such as the blower speed control The following features are available on this system Digital display Auto mode Temperature scales for C or F decided by user preference Heated rear window with heated windshield as an optio
141. perature selected by the driver The A CCM adjusts the position of the upper cool air bypass flap to meet the desired selection The resistance range of the potentiometer is nominally 2 8 Minimum differential RED 8 10 1 volt wiper feedback voltage Maximum differential BLUE 2 10 4 volt wiper feedback voltage Face Vent Differential Temperature Control Diagnostic Monitoring The A CCM monitors the face vent differential temperature control circuit for open circuit high resistance and short circuit conditions If a fault is present a DTC will be flagged No default value is used for face vent differential control circuit failure DTCs FACE VENT DIFFERENTIAL TEMPERATURE CONTROL THROUGH 1997 MY WDS Control Panel B1849 24 B1852 24 7703 83 Date of Issue 07 01 2002 Student Guide 2 5 5 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training AIR CONDITIONING HEATER UNIT Air Distribution continued OUTLET AIR TEMPERATURE AND FLOW WINDSHIELD gt SIDE WINDOW VENTS lt gt COOL AIR BYPASS O Su I 2 EVAPORATOR 7 lt gt AIR IN FRONT FROM BLOWER FEET ms dm T703 79 NOTES 2 5 6 Student Guide Date of Issue 07 01 2002 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training DEFROST SELECTED m v VY COOL WARM AIR OUT BLEND AIR
142. purely down to counting the steps of rotation Do nottry to measure an output Any fault concerns are covered by DTCs and are very effective Stepper motors will cease rotation on engine cranking and continue after the engine has started this is to prevent any low battery voltage problems The stepper motor can stall if the battery voltage is too low Air flow force can interrupt door movements when current available to drive the stepper motor is low If for some reason a panel is disconnected without the battery being isolated be sure to refit the black connector first the white connector second This enables power to be at the stepper motors prior to powering the climate con trol panel software The control module recalibrates stepper motors by driving the motors end to end when a battery reconnection occurs After 85 ignition cycles the stepper motors will recalibrate 2 minutes after ignition off Date of Issue 07 01 2002 Student Guide 4 4 15 ae JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM EATC SYSTEM Components continued Stepper Motors continued Manual Reset A panel stepper motor manual reset method exists and is listed below Select full cooling Select full heating Back to full cooling Select face followed by floor Then select face again Finally select defrost If there is any doubt then a battery reset should be completed wait two minutes before reconnection The
143. r Relay Connector IP101 White 26 way 1 Wire OY OB The battery saver relay is controlled by the GEM for 20 minutes after the ignition has been turned off During this period the battery saver relay supplies 12v to pin IP101 1 then internally through the control module to the stepper motor drive circuits This allows the control module to carry out the anti misting strategy This is achieved by operating certain flaps to prevent warm moist air reaching the cold glass surface which can cause fog ging of the windscreen in certain climatic conditions Anti Misting Control Two minutes after ignition is switched off the control module controls the system to prevent moisture condensation forming on the windscreen This is achieved by Closing off the defrost flap Driving the recirculation flap to fresh NOTE The defrost flap is not driven closed if the previous condition for the climate control system was full defrost The battery saver relay serves many other areas on the vehicle EATC A CCM LH amp RH footwell lamps LH amp RH vanity mirror lamps lights Front interior lights LH amp RH door courtesy lamps Trunk lamp Therefore any concerns with the battery saver relay functionality will show up by the lamps listed above not operating The customer complaint will be no air flow where he she would expect it due to no door flap control The battery saver rel
144. rature When the compressor ON request message is present on the SCP network the PCM receives the message and cycles the compressor clutch ON OFF as long as the message remains The PCM will disengage the compressor clutch during the following engine operating conditions During engine cranking At wide open throttle with vehicle speed below 95 mph 153 km h maximum 10 seconds clutch disengage At engine speed above 5882 rpm At very low engine speed V8 400 disengage gt 550 engage V6 450 disengage gt 650 engage During fail safe cooling V6 only The A CCM requests compressor ON at evaporator discharge air temperature above 2 2 C 36 F and compressor OFF at evaporator discharge air temperature below 1 1 C 34 F The A CCM will not request compressor ON at ambient temperatures below 3 C 27 F Air Conditioning Pressure Sensor The A C pressure sensor is a component of the powertrain control system The sensor located on the high side com pressor discharge pipe is a pressure transducer that monitors compressor discharge pressure The sensor is mounted on a Schrader type valve to allow service replacement without the need for discharging the refrigeration system The PCM receives a feedback voltage signal from the sensor that is used to calculate a equivalent refrigerant pres sure The PCM will cycle the compressor clutch ON OFF as necessary based on the refrigerant pressure calculation
145. ressor continued Compressor Drive Belt Adjustment Both AJ16 and V12 engine drive belts use adjustable idler pulleys for belt tensioning The AJ16 tensioner operates in a slotted bracket The V12 tensioner operates on a pivoting bracket COMPRESSOR DRIVES 7703 56 8 Student Guide Date of Issue 07 01 2002 AJ16 V12 CLIMATE CONTROL JAGUAR Service Training Compressor Clutch Control AJ16 The ECM may delay compressor clutch engagement for four seconds depending on engine operating temperature V12 The ECM inhibits compressor operation under the following conditions Engine coolant temperature above 120 C 248 P Engine speed below 500 rpm the compressor is switched on again 20 seconds after the engine speed reaches 566 rpm e Full throttle operation the compressor is switched off for 15 seconds It is switched on again after 15 seconds or when the ECM no longer sees full throttle Compressor Clutch Diagnostic Monitoring V12 systems the A CCM monitors for compressor lock conditions when the B signal is present No default val ue is used for this signal There is no compressor lock sensor in AJ16 systems AJ16 AND V12 COMPRESSOR CLUTCH CONTROL XJ6 AND XJ12 1995 97 COMPRESSOR SPEED V12 ONLY ENGINE TEMP COMPRESSOR ON OFF LOCK SENSOR V12 ONLY COMPRESSOR CLUTCH CONTROL PANEL COMPRESSOR cONTAC
146. rigerants from an A C system during service Depending on how these refrigerants are processed after removal they can be classified as recycled reclaimed or extracted Recycled refrigerant Recycled refrigerant is cleaned to remove contami nants produced during normal operation of the A C system recycled refrigerant from non vehicle mobile system or a building type A C system for exam ple contaminates recycled mobile vehicle refrigerant Reclaimed refrigerant Reclaimed refrigerant is processed to the same stan dards and purity as new refrigerant This process requires expensive equipment not ordinarily found in dealership service departments Reclaimed and recy cled refrigerant will perform equally well in all mobile A C systems Extracted refrigerant Extracted refrigerant is simply removed and stored in an approved container This process is used when ser vicing the refrigeration system and the refrigerant must be removed and stored from the A C system Storing refrigerant Both R 12 and R 134a are gases at normal room tem perature and they can be hazardous if stored improperly New refrigerant stored in its original prop erly filled container usually poses no safety hazard However recycled refrigerant can be dangerous if it is stored in the wrong type of container or in an overfilled container To prevent accidents when handling recycled refrigerant always follow the rules below Never save
147. rigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Control Module 2 8 Climate Control Panel 2 9 Temperature Control Sensors 2 10 Vehicle Systems Interfaces 2 11 Control Panel Diagnostics 2 12 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training CLIMATE CONTROL PANEL The control panel is the interface between the driver and the air conditioning control module A CCM It has a 4 bit microprocessor that processes information and converts the selected switch positions and settings into digital data that is communicated to the A CCM over a serial data link Data transfer between the control panel and the A CCM occurs cycles when the 5 signal is received from the The total communication contains 29 CLOCK pulses In order to avoid errors the A CCM must receive two identical data transfers before any action is taken Power supply to the control panel is provided via the A CCM when the ignition switch is in position I auxiliary or II ignition CLIMATE CONTROL PANEL DISPLAY TEMPERATURE C OR F SELECTED BLOWER SPEED MANUAL MODE EXTERIOR TEMPERATURE SELECTED Od AUTOMATIC MODE SELECT
148. rvice ports that can be utilized when recharging the system Both pipes are secured with quick fit connectors at the evaporator inlet and outlet ports with both connections having a secondary slip or collar for added security Service tools are available to decouple the spring locked connections These tools are common to the S TYPE refrig eration system NOTES 4 2 8 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 CLIMATE CONTROL SYSTEM 4 1 4 2 Overview Refrigeration System 4 3 Heating Cooling System 4 4 4 5 46 EATC System Service Information Task Sheets 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM HEATING COOLING SYSTEM Overview The system includes the following components Water pump Hoses Radiator Cooling fans Thermostat Reservoir Antifreeze Distilled water ae JAGUAR Service Training HEATING COOLING SYSTEM COMPONENTS 703 147 NOTES 4 3 2 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM Components Water Pump The water pump is mounted on the rear of the left hand bank cylinder head and is driven off the e
149. s latent heat of vaporization After picking up heat in the evapora tor the refrigerant gas is drawn into the inlet side of the compressor where it begins another refrigeration cycle JAGUAR Service Training REFRIGERATION FLOW RECEIVER HEAT TO DRIER CONDENSER ATMOSPHERE COMPRESSOR N EN FF JH P d EXPANSION EVAPORATOR VALVE HEAT FROM VEHICLE INTERIOR 7703 35 REFRIGERATION FLOW RECEIVER HEAT TO DRIER ATMOSPHERE CONDENSER S xf COMPRESSOR ur NT CAN gt LLLLLLLLLA EVAPORATOR HEAT FROM VEHICLE INTERIOR EXPANSION VALVE 7703 36 Date of Issue 07 01 2002 Student Guide 1 6 5 CLIMATE CONTROL REFRIGERATION CYCLES KG JAGUAR Service Training Refrigeration Cycle in an Orifice Tube System ORIFICE SYSTEM COMPONENTS COMPRESSOR 2 2 S 4 G _
150. s switched off and the fresh air or recirculation blower flaps are set to recirculation shutting off outside air intake NOTES Date of Issue 07 01 2002 Student Guide 2 8 3 KG JAGUAR Service Training XJ XK CLIMATE CONTROL SYSTEM CLIMATE CONTROL PANEL Climate Control Panel Switch Functions CLIMATE CONTROL PANEL SWITCH FUNCTIONS oe DISPLAY OUTSIDE C7 F SELECT AIR TEMPERATURE LED DISPLAY SYSTEM ON AND MANUAL RECIRCULATION SYSTEM ON SYSTEM ON OFF AND SYSTEM ON AND AUTOMATIC MANUAL FAN SPEED MANUAL OPERATION Goer gt SYSTEM ON DEFROST ONLY WINDSHIELD AND AND DEFROST SELECT FOOT LEVEL WINDSHIELD HEATER OPTIONAL FOOT LEVEL HEATED REAR WINDOW BI LEVEL INTERIOR TEMPERATURE INCREASE 1 STEPS FACE LEVEL INTERIOR TEMPERATURE DECREASE 1 STEPS MANUAL AIR DISTRIBUTION 703 101 This switch is a combination switch for manual blower speed control and system ON OFF Pushing the rotary switch provides system ON or OFF Turning the switch provides manual blower control and overrides the AUTO control blower speed functions Recirculation Pressing this switch closes off the outside air intake and recirculates cabin air The LED indi cates the status Momentary press one beep five minute operation Long duration press two beeps continuous operation A C This switch signals the A CCM to request air conditioning compressor oper
151. sor clutch should cycle around three times in any one minute 4 Maximum This is taken at 50km h 30mph with the engine at approximately 2000 rpm 703 160 The sensor is located in the climate control housing the right hand side of the unit It is easily removed from the housing by way of a trim fork type removal tool Because the sensor is situated very close the evaporator the sensor is coated to prevent moisture affecting the per formance of the unit Low Refrigerant The evaporator sensor also serves as a low pressure refrigeration charge sensor and controls the compressor clutch cutoff should the refrigeration charge be low The reason why the evaporator sensor can achieve this is due to the way refrigerant behaves in an enclosed environ ment volume temperature and pressure are all interrelated e g 600 grams 0 C 32 F 3 bar 100 grams 240 104 F 3 bar bar absolute 2 bar gauge pressure Using a look up chart with any one of the known values will provide an indication of what is happening inside the system This look up chart has been built into the control strategy of the control module From the evaporator core temperature the system knows the volume and pressure inside the refrigeration system and controls the compressor clutch request accordingly NOTES 4 4 12 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Train
152. t and it is also used for extracting the tube assembly If the tube breaks during extraction then a second special tool 412 035 is used for the removal of the remaining broken piece This tool allocation may change as it is easy enough to extract the fixed orifice tube using a pair of pointed nose pliers A tool can be purchased from Snap On should one be required 4 2 4 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Refrigerant Flow Control The refrigerant is metered by sending the evaporator sensor signal to the climate control module and then on to the engine management system This signal allows the engine control module ECM to cycle the compressor clutch in and out as dictated by the evaporator temperature The overall effect is control of refrigerant flow through the evaporator Refrigeration system behavior is in principle at least the same as it would be for an expansion valve system Fixed Orifice Tube Operation FIXED ORIFICE TUBE The clutch cycling fixed orifice tube system allows the compressed liquid to expand by metering the liquid into the low pressure area of the evaporator The low pressure is created by the restriction of the fixed orifice tube and the suction of the scroll type compressor The liquid begins to change state by transferring from a high pressure liquid into a low pressure gas more or less immediately after it leaves the
153. t key NOTE The ambient sensor defaults to 10 C 50 F If the battery supply is lost and the ambient temperature is high this is the reading the driver will see A system reset will occur at 35 km h 22mph when the fault is corrected this may take a few minutes to fully recalibrate However if the surrounding ambient temperature is cold then the control module will display the ambient sensor reading immediately The ambient sensor signal is also utilized by other areas of the system such as automatic control of the heated rear window heated door mirrors and heated windshield at 1 C 30 F It assists the evaporator sensor with control of the compressor by extending the compressor clutch switching points e g high ambient will result in a longer com pressor clutch on time 4 4 10 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training In Car Sensor The in car sensor is combined with the motorized aspirator assembly and is mounted behind a small grille in the fas cia The location is next to the steering wheel towards the center line of the vehicle The motorized aspirator has a voltage supply when in Key Position Il The 12v feed is from the ignition relay located in the CJB the relay is listed as R18 on the fuse and relay schematic This may change to the battery saver relay sup plying the motorized aspirator 12v feed The in car sensor has a 5v reference voltage
154. to vaporize the refrigerant The heat used during the conversion process boils the liquid refrigerant to gas state and allows the air with 703 14 2 the heat removed to enter the passenger cell Because the evaporator also removes moisture from the incoming air this moisture is drained away via a tube that leads out beneath the vehicle Therefore while the air conditioning system is functioning water may be seen emit ting from the drain tube and forming a puddle beneath the vehicle If any moisture remains held on the evaporator matrix fins and the evaporator is cooled down too much the evaporator matrix will freeze over causing an air passage problem To overcome this eventuality an evaporator temperature sensor is employed which terminates the compressor clutch action at a given threshold NOTES 4 2 6 Student Guide Date of Issue 07 01 2002 JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM Suction Accumulator SUCTION ACCUMULATOR The suction accumulator is located under the right hand front wheel arch liner and secured by two fixings INLET PIPE 1 t OUTLET PIPE The purpose of the suction accumulator is to ensure E that only refrigerant gas and not liquid is passed to the compressor The suction accumulator is connected to the low pres sure side of the refrigeration system The functions of suction accumulators are similar to those of the receiver drier unit they include
155. trol Panel Telematics This panel contains 178 mm 7 in touch sensitive screen display control system with eleven climate control but tons while the remaining features are selected via the navigation touch screen display All the operating features for the EATC mid line system apply to the navigation system The main distinguishing ele ment that differentiates the two systems is the location of the CM On the EATC mid line system the CM is located in the control panel assembly However the navigation system utilizes remote CM because Denso not Visteon produces the navigation display unit NAVIGATION CONTROL INTERFACE PANEL TELEMATICS com Hinn eases T703 155 NOTES 4 4 4 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training Navigation Keys Three levels of soft key functionality exist Agrayed out soft key indicates that the function is inhibited Asoft key with a red ring circling the circumference indicates that the feature is active soft key not grayed out with no red ring indicates that the soft key is available but not active Pressing the OFF soft key activates the RAM air feature in lieu of the MUTE feature and enables the air distribution soft keys The Mute function reduces the blower speed to two chaplets thereby lowering background
156. ture Which reading matches the control panel displayed temperature How is the ambient temperature calculated in relation to wheel speed Why Under what driving conditions will the ambient temperature displayed not match the actual outside temperature Demonstrates Competence Instructor Signature Date 4 6 4 Student Guide Date of Issue 07 01 2002 X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training TASK SHEET 4 X TYPE ORIFICE TUBE SERVICE Using the proper tools and equipment evacuate refrigerant remove inspect and reinstall the orifice tube recharge the system on the assigned X TYPE Materials Safety glasses fender covers and gloves JTIS record section after printing a copy Recycling recovery equipment e Recommended special tool for orifice tube removal 1 Using industry standard procedures evacuate the refrigerant from the assigned vehicle 2 Remove and inspect the orifice tube for any dirt or debris Actual tool used to remove orifice tube FIXED ORIFICE TUBE 703 168 3 Using the graphic as reference which way should the arrow face when reinstalling the orifice tube 4 Replace pipe O rings and reinstall the orifice tube DO NOT OVER TORQUE FITTINGS Recharge vehicle with correct amount of refrigerant 6 Check system for proper operation and leaks Demonstrates Competence Instructor Signature Date Date
157. uit conditions If a fault is present a DTC will be flagged A default value of 0 kW m is substituted by the A CCM if ERRANA a solar sensor fault is present DTCs WDS Control Panel B1258 21 B1260 21 NOTES Date of Issue 07 01 2002 Student Guide 2 9 5 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 9 6 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Control Module 2 8 Climate Control Panel 2 9 Temperature Control Sensors 2 10 Vehicle Systems Interfaces 2 11 Control Panel Diagnostics 2 12 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 KG XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training VEHICLE SYSTEMS INTERFACES Windshield Rear Window and Mirror Heaters Control of the windshield rear window and mirror heaters is integrated with the climate control system The engine must be running for the heaters to operate The A CCM will not switch on the heaters until it receives an engine speed signal from the ECM In V12 systems the CCM will
158. upts the learning sequence The reason for stepper motor calibration is that there are no feedback pots for door position JAGUAR Service Training Control Module Ground Connector IP101 White 26 way AMP Pin 15 Wire B G37BR ground eyelet located on the cross car beam left hand side This is the main climate control module ground point This ground stud is shared with other components such as Turn indicators Indicator audible warning Master light switch not all models Not in park switch Instrument cluster Therefore look for clues in other components not oper ating correctly but don t disregard a broken corroded eyelet or leg Control Module Ignition Supply Connector IP101 White 26 way AMP Pin2 Wire WR 10 amp fuse The ignition supply is used to invoke the climate con trol module wake up and shut down strategies These would be in the form of anti misting temperature dis play logic system monitoring and storing of DTCs This supply is also used by other components or sys tems such as In Car aspirator Jgate supply 1962 connector power Quick checks can be made on the motorized aspirator and J gate if this voltage supply is in doubt Date of Issue 07 01 2002 Student Guide 4 4 7 ae JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM EATC SYSTEM Components continued Battery Save
159. used for low speed fan drive Fan speed switch ing is accomplished through a fan control relay module For engine coolant temperature a radiator thermostatic switch with two sets of contacts one for slow speed fan drive and one for high speed fan drive is used Low Speed Fan Operation Both fans run at low speed in series when the radiator coolant temperature reaches 86 C 187 F or the refrigerant pressure reaches 12 bar 174 psi High Speed Fan Operation Both fans run at high speed in parallel when the radiator coolant temperature reaches 100 C 212 F and or the refrigerant pressure reaches 20 bar 290 psi Beginning with VIN 761570 the refrigerant single pressure switch has been deleted from AJ16 engine vehicles The cooling fans run continuously when the ignition is switched to position ll Cooling Fan Control V12 The radiator and condenser cooling fans are controlled by radiator coolant temperature The V12 uses the same dual temperature radiator thermostatic switch and fan control relay module as the AJ16 Low Speed Fan Operation Both fans run at low speed when the radiator coolant temperature reaches 86 C 187 F High Speed Fan Operation Both fans run at high speed when the radiator coolant temperature reaches 100 C 212 F NOTES 12 Student Guide Date of Issue 07 01 2002 AJ16 V12 CLIMATE CONTROL JAGUAR Service Training AJ16 COOLING FAN CONTROL UP TO VIN 761569 X
160. utes then time out The LED indicates the status The windshield heater operates only when the engine is running This switch selects the backlight and door mirror heaters The backlight will operate for 20 minutes and the door mirror heaters will operate for 11 minutes then time out The LED indicates the status The heated backlight and mirror heaters operate only when the engine is running The temperature select buttons increase or decrease the desired interior temperature in 1 increments C or F as selected Four air distribution manual override buttons are used to override the automatic function and distribution override distribute air as the driver selects FACE FACE AND FEET bi level FEET ONLY and WINDSHIELD AND FEET The LED indicates the status Date of Issue 07 01 2002 Student Guide 2 8 5 XJ XK CLIMATE CONTROL SYSTEM JAGUAR Service Training 2 8 6 Student Guide Date of Issue 07 01 2002 A GUA R SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 XJ XK CLIMATE CONTROL SYSTEM 2 1 Overview 2 2 Refrigeration System 2 3 Cooling Fan Control 2 4 Heating Cooling System 2 5 Air Conditioning Heater Unit 2 6 System Logic 2 7 Control Module 2 8 Climate Control Panel 2 9 Temperature Control Sensors 2 10 Vehicle Systems Interfaces 2 11 Control Panel Diagnostics 2 12 Task Sheets 3 S TYPE CLIMATE CONTROL SYSTEM 4 X TYPE CLIMATE CONTROL SYSTEM
161. utside air that the light rays pass through is not heated NOTES Date of Issue 07 01 2002 Student Guide 1 2 5 CLIMATE CONTROL CLIMATE CONTROL FUNDAMENTALS Heat Movement continued CHANGING STATES OF MATTER SO LIQUID HEAT VAPOR SOURCE SOURCE OR GAS 7703 09 LATENT HEAT MOVEMENT SOLID LIQUID VAPOR KG JAGUAR Service Training States of Matter The states of matter are solids liquids and gases A solid may be a cube of ice and when heat is added to the ice the solid ice cube will change state into a liquid If addi tional heat is added to 100 C 212 F the liquid will change state into a gas The air conditioning system works through a fluid called refrigerant The refrigerant in an A C system that is functioning is always changing state from a liquid to a gas and back to a liquid Latent Heat Latent heat is the amount of heat that must be added or removed from a liquid to make it change state It is called latent heat because you cannot measure it with a ther mometer For example if you heat 453 grams of water at sea level to 100 C 212 F you must continue to apply at least 993 030 joules of heat energy to convert it to steam PENE HEAT As you add these additional joules to the water the tem perature remains unchanged The additional heat called latent heat or hidden heat is the he
162. wing hot coolant into the heater core B The water valve is allowing hot coolant into the heater core C Full cold is selected on the control panel D The vehicle is in fail safe engine cooling mode Date of Issue 07 01 2002 Student Guide 1 ae JAGUAR CLIMATE CONTROL SYSTEMS JAGUAR Service Training STUDENT PROFICIENCY POST TEST 5 When using data logger WDS to observe the flap actuators a 2001 S TYPE the following readings were obtained Temperature demand full cold FACE selected on the control panel 95 F ambient tem perature Cold air bypass 185 Panel 167 Fresh recirc 40 Defrost 60 What do these readings indicate ____ A The panel flap is stuck closed ____ B Cold air bypass flap is allowing air through the heater core _ C The cold air bypass flap is allowing air to go around the heater core D The defrost flap is allowing maximum de humidified air on to the window 6 When replacing the A CCM 2000 2002 S TYPE you should use WDS to configure it for ____ A Navigation equipped or non navigation B Engine size Heated Wiper Park or heated front windscreen C Heated rear glass electrochromic rear view mirrors D Automatic or manual transmission E All the above 7 Concerning a 2001 S TYPE Technician A states that the engine must be running before the glass heaters will operate Technician B states that the engine must be running for the eng
163. xhaust camshaft WATER PUMP The drive belt is not adjustable It has a service change schedule at 112 000 km 70 000 miles The exhaust camshaft is used to ensure that no interfer ence occurs with the VVT operation T703 150 Hoses Most hoses have a quick fit connector of one type or another that is spring clip or spring clamp The spring clamp has a special tool for easy release of the clamp type clip which can be purchased separately if required A drain plug is fitted in the bottom hose for coolant drainage Filling is via the reservoir which has self venting hoses from the engine and radiator COOLING SYSTEM HOSES 703 151 Date of Issue 07 01 2002 Student Guide 4 3 3 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training HEATING COOLING SYSTEM Components continued Radiator The radiator consists of a 32 mm matrix core with plastic end tanks The assembly is mounted using four rubber iso lators two top and two bottom which are located on the plastic end tanks The radiator is mounted lower cross member This cross beam requires removing to gain access to the radiator for servicing requirements The radiator removal direction is out from below that is downwards once the cross member is removed Fitted on both sides of the radiator end tanks are foam side seals to prevent air bypassing the radiator core These seals should not be missing or damaged
164. y compressor cancel at temperatures where compressor damage may occur Automatic control of windshield backlight and mirror heaters SCP ambient temperature message Blower speed adjusted to ambient temperature The chart shows the relationship of ambient temperature and blower speed AMBIENT AIR TEMPERATURE BLOWER MOTOR VOLTAGE 7 TH BAR MANUAL ONLY 125V 12 5V AUTO AND MANUAL 6 TH BAR MAXIMUM AUTO 11 5 V 5 5 gt E 74V 5 mI ta 12 C 10 F 10 C 50 F 36 C 97 F TEMPERATURE 703 124 Date of Issue 07 01 2002 Student Guide 3 4 13 S TYPE CLIMATE CONTROL SYSTEM DATC SYSTEM System Details continued DUAL SOLAR SENSOR ae JAGUAR Service Training Dual Solar Sensor The dual solar sensor located on the top center of the fascia contains two light sensitive photodiodes Each photodiode is positioned to sense solar load only from one side of the vehicle LH or RH LH and RH solar load is determined by the A CCM by the change in sen sor circuit voltage The A CCM applies a fixed voltage to ee each sensor photodiode and monitors the voltage to a common sensor reference ground The separate LH RH solar load signals allow the to independently trim driver and passenger discharge air temperature to compensate for LH and RH solar load 703 125 NOTES 3 4 14 Student Guide Date of Issue 07 01 2002
165. ystem to the maximum level indicated on the reservoir housing This is not a quick operation but the procedure described here should be followed in order to ensure the correct operation of the cooling system NOTES Date of Issue 07 01 2002 Student Guide 4 3 7 x JAGUAR Service Training X TYPE CLIMATE CONTROL SYSTEM 4 3 8 Student Guide Date of Issue 07 01 2002 JAGUAR SERVICE TRAINING JAGUAR CLIMATE CONTROL SYSTEMS 1 CLIMATE CONTROL 2 CLIMATE CONTROL SYSTEM 3 S TYPE CLIMATE CONTROL SYSTEM 4 CLIMATE CONTROL SYSTEM 4 1 4 2 4 3 Overview Refrigeration System Heating Cooling System 4 4 EATC System 45 4 6 Service Information Task Sheets 5 CLIMATE CONTROL REFERENCE JAGUAR Service Training Course T703 DATE OF ISSUE 07 01 2002 ae X TYPE CLIMATE CONTROL SYSTEM JAGUAR Service Training EATC SYSTEM There are two versions of the electronic automatic temperature control EATC system EATC Non Telematics version Telematics version EATC Control System EATC Control Panel Non telematics This interface panel is equipped with a digital display and in many cases operates on a logic similar to that of previ ous Jaguar climate control systems The information shown on the panel consists of the following items External temperature permanently displayed when system is operational Blower motor s

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