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Custom Cruise III System - 73

1. LIQUID CRYSTAL CRUISE ON OFF SLIDER SWITCH ON INSTRUMENT CONNECTOR ek EOS SLIDER SWITCH OFF SET COAST DEPRESSED OPTIONAL SWITCH cm NORMALLY OR NORMAL Vy C12 BRAKE b 916 39 9 AGE SWITCH c CRUISE ON OFF a ret RESUME ACCEL SLIDER SWITCH IN R A POSITION Era Y C11 INPUT SLIDER SWITCH ON SET COAST DEPRESSED cn eu OR NORMAL SELCOAST N SLIDER SWITCH OFF SET COAST gt ve VENTVALVE 2 N DEPRESSED OR NORMAL ES sr e L C14 IGNITION AT FUSE BLOCK x 107 SET COAST SLIDER SWITCH ON SET COAST DEPRESSED gt C13 INPUT SLIDER SWITCH ON SET COAST NORMAL T SLIDER SWITCH OFF SET COAST NORMAL gt PEEM VA NC SPEED SENSOR LO C15 and SPEED SENSOR 1 8 to 2 5 VAC MEASURED BETWEEN A15 AND B11 C15 SPEEDSENSORM B Dii INPUT APPROXIMATE VEHICLE SPEED 10 MPH Dh la INSTRUMENT SEE CLUTCH AND BRAKE CLUTCH NOT APPLIED PANEL SCHEMATIC BRAKE INPUT BRAKE CLUTCH APPLIED CONNECTOR RESISTANCE CHECK MODULE DISCONNECTED VALVE SPECIFIED BIC T TEST TERMINAL FUNCTION RESISTANCE CONDITIONS D8 TO VENTVALVE 30 559 MEASURED TO GROUND SERVO CONNECTED GROUND CONTROL OPEN CIRCUIT MEASURED TO GROUND SERVO DISCONNECTED C10to SPSHIGHAND 15250 MEASURED BETWEEN C10 and C14 SERVO to ae C14 SPS LOW CONNECTED
2. 4 1 Preliminary Inspection 4 1 Teme eos 4 2 Cruise System Inoperative 4 2 Applicable to 1984 Corvette Only 4 5 Performance Symptoms and Correction All Cruise Systems 4 7 Custom Cruise Ill Quick Checker 4 8 Quick Checker Test Procedure 4 9 List of Illustrations Figure No Page 1 1 Mode Control Switches on Turn Signal Lever 1 1 1 2 Mode Control 1984 Chevrolet Berlinetta 1 1 1 3 2 1 2 2 2 3 2 4 2 5 2 6 2 10 2a 2 18 2 13 3 2 3 3 3 4 3 5 3 6 3 7 3 8 4 1 4 2 4 3 4 4 4 5 4 6 Electronic Cruise Control Operation 1984 Chevrolet Berlinetta 1 3 Mode Control Switches 2 1 VSS Buffer 2 2 Speed Sene 2 2 Electronic Controller Module 2 2 Combination Vacuum Release Valve Converter eC Ton e ee 2 3 Vacuum Release Valve 2 3 Combination Vacuum Release Switch FITO ig 2 3 Electric Vacuum Release Valve Baule Fiero 2 4 Combination Cruise Stop Light Switch 2 4 Wyre Cie SWIER 2 4 Servo Unit and Operating Electro Mechanism 2 5 Typical Pneumatic System including Vacuum Accumulator Check Valve and Related Hoses
3. SLIDER SWITCH ON SLIDER SWITCH OFF SET COAST DEPRESSED OR NORMAL SLIDER SWITCH IN R A POSITION SLIDER SWITCH ON SET COAST DEPRESSED OR NORMAL SLIDER SWITCH OFF SET COAST DEPRESSED OR NORMAL RESUME ACCEL INPUT SLIDER SWITCH ON SET COAST DEPRESSED SLIDER SWITCH ON SET COAST NORMAL SLIDER SWITCH OFF SET COAST NORMAL SET COAST INPUT GREATER THAN 4V HIGH SPEED SENSOR NEAR 0V LOW CRUISE LAMP 12V RESISTANCE CHECK MODULE DISCONNECTED CONDITIONS MEASURED TO GROUND SERVO CONNECTED MEASURED TO GROUND SERVO DISCONNECTED DRIVE WHEELS ROTATING CRUISE ENGAGED SPECIFIED TEST TERMINAL FUNCTION RESISTANCE C to VENT VALVE GROUND ng V eee OPEN CIRCUIT CONTROL SPS HIGH MEASURED F TO H SERVO CONNECTED o9 n MEASURED F AND H TO GROUND SERVO DISCONNECTED OPEN CIRCUIT SPS LOW GROUND MEASURED TO GROUND SERVO CONNECTED MEASURED TO GROUND SERVO DISCONNECTED VACUUM VALVE CONTROL K to GROUND OPEN CIRCUIT A J to GROUND MEASURED TO VEHICLE GROUND GROUND 3 How the System Operates 3 How the System Operates VOLTAGE CHECK AT CLUSTER MODULE CONNECTED SPECIFIED VOLTS TO TEST TERMINAL FUNCTION GROUND CONDITIONS BRAKE INPUT BRAKE CLUTCH NOT APPLIED C12 BRAKE CLUTCH APPLIED
4. 2 6 Harness Adapter 2 6 Block Diagram AC Custom Cruise Ill System 3 1 Block Diagram AC Custom Cruise Ill System with Buffer Amplifier and PM Generator 3 1 Typical Installation AC Custom Cruise III System K 34 Application 3 2 Typical Installation Integrated Custom Cruise Je a 0 NA 3 3 1984 Custom Cruise Ill System Schematic Optical Speed Sensor Buffer Assembly Identifies Vehicle Applications 3 5 1984 AC Custom Cruise Ill System Schematic A and C Cars Speed Sensor PM Generator Identifies Other Vehicle Appieglione 3 7 AC Integrated Custom Cruise III System Schematic 1984 Corvette 3 9 AC Custom Cruise Ill System Schematic 1984 Pontiac Fiero P Car 3 11 Servo Resistance Measurement 4 2 Speedometer Signal Generator J 33431 4 6 Quick Checker Model No ET 3475 4 8 Quick Checker Model No J 34185 4 8 Quick Checker Model No QC111 4 9 Optional Adapter QC31 for Pontiac Fiero ME Om eee aoe 4 9 m 1 How to Use Custom Cruise Ill Introduction The 1984 AC Custom Cruise Ill system is an extension of the cruise control system that AC Spark Plug Division has de signed and produced since the 1977 vehicle model year The Custom Cruise Ill system has been adapted to accommo date the lower manifold vacuum levels of
5. On all 1984 applications except Corvette and Pontiac Fiero P car the Custom Cruise Ill system has a tap up tap down speed adjustment feature Tap up results in a one mile per hour speed increase by merely tapping the RESUME ACCEL slider for less than one second Tap up may be repeated but speed increase is limited to 10 miles per hour above vehicle speed Tap down results in a one mile per hour speed decrease by merely tapping the SET COAST button for less than 0 4 of a second Each tap decreases speed and may be accumulated it is limited to a minimum cruising speed of 25 miles per hour i 1 2 1 How to Use Custom Cruise Ill Mode Control 1984 Chevrolet Berlinetta Figure 1 3 describes operation of the 1984 Chevrolet Berlinetta Electronic Cruise Control The accelerator may be depressed at any time to override the cruise system Release of the accelerator will return the vehicle to the previous set cruise speed v STEERING WHEEL CONTROLS ON OFF Rocker switch floor console SET Depress SET COAST button and release at desired control speed COAST Depress button and hold until vehicle speed decreases to desired speed Release button TAP DOWN Momentarily depress and release button Speed will be decreased 1 mph for each tap Q Momentarily depressing RESUME ACCELERATE button will return vehicle to original set speed RESUME Hold button down and the ve
6. uum Release Valve Converter Clutch Switch figure 2 5 The Vacuum Release Valve provides an addi tional vent for the servo unit to the atmosphere when the brake pedal is held in a depressed position This venting action is spring actuated when the brake pedal is depressed and occurs within the free travel of the brake pedal arm At the same time the con tacts in the Converter Clutch Switch open which disengages the locking clutch mechanism in the transmission e Vacuum Release Valve Vehicles without a lock up torque converter clutch transmission use a Vacuum Release Valve figure 2 6 It provides an additional vent for the servo unit to the atmosphere when the brake pedal is held in a de pressed position This venting action is spring ac tuated when the brake pedal is depressed and occurs within the free travel of the brake pedal arm e Combination Vacuum Release Switch A combination vacuum release switch is located in the brake pedal bracket in the Pontiac Fiero P car figure 2 7 When the brake is applied the vacuum release switch de energizes an electric vacuum release valve see figure 2 8 Figure 2 7 shows a brake pedal operated combination vacuum release torque converter clutch switch used with automatic transmissions On manual transmission cars a similar switch arrangement is used on the brake and clutch pedal brackets 2 Components in the System Figure 2 5 Combination Vacuum Release
7. VIEW Figure 2 11 Servo Unit and Operating Electro Mechanism 2 9 2 Components in the System Fata e Vacuum Accumulator 2 For acceptable cruise performance vehicles with low manifold vacuum at road load a Vacuum Accumulator figure 2 12 is used The Accumulator is attached to the intake manifold through a check valve and stores the high vacuum level that is available during periods of low engine loading The system operates on accumulator vacuum when higher than manifold vacuum The Vacuum Accumulator or check valve is not used with diesel engines ACCUMULATOR 2 PORT CHECK VALVE TO ENGINE VACUUM TO TO BRAKE ACCUMULATOR SWITCH VACUUM RELEASE VALVE TO ENGINE VACUUM THROTTLE LINKAGE CONNECTOR Figure 2 12 Typical Pneumatic System including Vacuum Accumulator Check Valve and Related Hoses Some systems use a 3 port check valve instead of a 2 port valve e Harness Adapter The Harness Adapter figure 2 13 is used on some Custom Cruise Ill applications to connect the Harness Assembly to the Servo Unit E e 5 WAY SERVO CONNECTOR Figure 2 13 Harness Adapter 2 6 3 How the System Operates Electrical Vacuum System Operation Figure 3 1 is a block diagram illustrating component relationships in the AC Custom Cruise III system The servo vent solenoid valve and servo vacuum solenoid valve control the vacuum level in the servo in response to in formation
8. Valve Converter Clutch Switch Figure 2 6 Vacuum Release Valve VACUUM RELEASE LARGE BARREL TORQUE CONVERTER CLUTCH Figure 2 7 Combination Vacuum Release Switch Pontiac Fiero 2 3 2 Components in the System Figure 2 8 Electric Vacuum Release Valve Pontiac Fiero Figure 2 9 Combination Cruise Stop Light Switch Figure 2 10 Typical Clutch Switch 2 4 Electric Vacuum Release Valve The electric vacuum release valve is used in the 1984 Pontiac Fiero P car figure 2 8 The solenoid in the valve is powered by vehicle ignition When the brake pedal is NOT depressed the solenoid is energized and the vacuum valve is closed When the brake is applied the solenoid de energizes and the vacuum valve and servo vent to the atmosphere the cruise function disengages See Vacuum Release Switch Figure 2 7 gt Combination Cruise Stop Light Switch The Combination Cruise Stop Light Switch figure 2 9 is used with a separately mounted vacuum re lease valve When the brake pedal is depressed the switch illuminates the stop lights and disengages the cruise One set of electrical contacts operate the stop light the other set operates the cruise disengage function Clutch Switch On vehicles with manual transmissions an electric Clutch Switch figure 2 10 is used Depressing the clutch for up or downshifting a manual transmission disengages th
9. OPEN CIRCUIT MEASURED BETWEEN C10 AND GROUND AND C14 AND GROUND SERVO DISCONNECTED 1984 CORVETTE CUSTOM CRUISE III INSTALLATION DIAGRAM D9 TO GROUND VACUUM VALVE 30 552 CONTROL OPEN CIRCUIT MEASURED TO GROUND SERVO CONNECTED MEASURED TO GROUND SERVO DISCONNECTED CRUISE GROUND MEASURED TO VEHICLE GROUND PM GENERATOR C15 to D11 CIRCUIT 346 to 4930 MEASURED BETWEEN C15 AND D11 Figure 3 7 AC Integrated Custom Cruise Ill System Schematic 1984 Corvette 3 9 3 10 3 How the System Operates 3 How the System Operates VOLTAGE CHECK AT CLUSTER MODULE CONNECTED Sd E JN VOLTS TO GROUND CONDITIONS VENT VALVE INPUT SLIDER SWITCH ON SET COAST NORMAL SPEED SENSOR LO TEST TERMINALI FUNCTION BRAKE INPUT BRAKE CLUTCH NOT APPLIED INSTRUMENT CONNECTOR NORMALLY OPEN BRAKE CLUTCH APPLIED CLUTCH SWITCH BRAKE CONNECTOR OPTIONAL SWITCH ENGAGE SWITCH De 9 9 Us CRUISE ON OFF SLIDER SWITCH ON ee AF o cro SLIDER SWITCH OFF SET COAST DEPRESSED Dj OR NORMAL RESUME ACCEL Js SET COAST VACUUM 9 RESUME ACCEL SLIDER SWITCH IN R A POSITION Ro VENT VALVE RELEASE X s3 N SSEWOD onore INPUT SLIDER SWITCH ON SET COAST DEPRESSED eo RADIO FUSE 4 OR NORMAL BRAKE SLIDER SWITCH OFF SET COAST E du SWITCH da DEPRESSED OR NORMAL ER 27 Lg ego o SET
10. ground depending on other uses of this signal e Control module connector terminal E is intended for an optional TCC signal figures 3 5 and 3 6 e The C car circuit shown in figure 3 6 is very similar to the circuit shown in figure 3 5 1 Terminal identification at the controller is identified by name i e BRAKE CRUISE ON OFF etc 2 The Buffer Amplifier located between the PM Generator and Control Module Connector has a variable signal out put 1 112 Hz for the speedo speed signal 0 556 Hz for the cruise signal o we ul 3 How the System Operates 3 How the System Operates VOLTAGE CHECK MODULE CONNECTED neg ni VOLTAGE TO TEST TERMINAL GROUND CONDITIONS BRAKE INPUT BRAKE CLUTCH NOT APPLIED 12034125 BRAKE CLUTCH APPLIED 12 WAY PED CONN NORMALLY OPEN 12020651 CRUISE MODE CONTROL CLUTCH SWITCH BRAKE W LOCK PART NO ENGAGE SWITCH CRUISE ON OFF SLIDER SWITCH ON OPTIONAL SWITCH 12020652 INPUT SLIDER SWITCH OFF SET COAST DEPRESSED gt 9RAKE i aye OR NORMAL D A SRUISE ON OFF Tm gt RESUME ACCEL en RESUME ACCEL SLIDER SWITCH IN R A POSITION sericoasr Si INPUT SLIDER SWITCH ON SET COAST DEPRESSED ter OR NORMAL CONTROL gt i onore ODULE 4 SLIDER SWITCH OFF SET COAST ot F IT p Uu vau DEPRESSED OR NORMAL 93d H 2A aeuo ec s ig e SET COAST SLIDER SWITCH ON SET COAST DEPRESSE
11. COAST SLIDER SWITCH ON SET COAST DEPRESSED VENT VALVE CONTROL NTO GROUND _SPEEDSENSORHI Ir SLIDER SWITCH OFF SET COAST NORMAL MN Ji x INSTRUMENT TEE e i SPEED SENSOR 1 8 to 2 5 VAC_ MEASURED BETWEEN R AND S PANEL li j INPUT APPROXIMATE VEHICLE SPEED 10 MPH CONNECTOR RESISTANCE CHECK MODULE DISCONNECTED VACUUM A VALVE SPECIFIED ace TEST TERMINAL FUNCTION RESISTANCE CONDITIONS MEASURED TO GROUND SERVO CONNECTED MEASURED TO GROUND SERVO DISCONNECTED OPEN CIRCUIT PM GENERATOR H MEASURED BETWEEN J AND E SERVO CONNECTED MEASURED BETWEEN J AND GROUND AND E AND GROUND SERVO DISCONNECTED SPS HIGH and SPS LOW J to E OPEN CIRCUIT 1984 PONTIAC FIERO P CAR CUSTOM CRUISE III INSTALLATION DIAGRAM A MEASURED TO GROUND SERVO CONNECTED OPEN CIRCUIT MEASURED TO GROUND SERVO DISCONNECTED VACUUM VALVE CONTROL GROUND CRUISE GROUND MEASURED TO VEHICLE GROUND PM GENERATOR CIRCUIT 346 to 4930 MEASURED BETWEEN R AND S Figure 3 8 AC Custom Cruise III Schematic 1984 Pontiac Fiero Car 3 11 3 12 4 Diagnostic Procedures p 1 Preliminary Inspection An undesirable cruise control performance symptom can be mechanical vacuum electrical or a combination of the three In all cases perform a visual inspection of all com
12. D 5 cruise cro S TE L INPUT SLIDER SWITCH ON SET COAST NORMAL e TCC MOD asi SLIDER SWITCH OFF SET COAST NORMAL gt SPEED SENDER 556 HZ MPH SRVO CRUISE 5 R LAMP CRUISE ENGAGED 9 pas GUT x SPEED GREATER THAN DRIVE WHEELS ROTATING ON SIGNAL 4V HIGH APPLICATIONS LISTED FIGURE 3 5 A NEAR OV LOW PED CONN i 12020646 RESISTANCE CHECK MODULE DISCONNECTED OPTICAL SPEED SENSOR BUFFER ASM PED CONN eli ci dl 12020052 Ex SPECIFIED ALL 84 IGN 1 vACVAWE TEST TERMINAL FUNCTION RESISTANCE CONDITIONS CA PS PL e veni 25007318 11 INCH SPEED SIGNAL cro VENT VALVE MEASURED TO GROUND SERVO CONNECTED amp 6 c3ScM i GROUND CONTROL MEASURED TO GROUND SERVO DISCONNECTED orti SENSOR BUFFER ASM E be FTOH SPS HIGH MEASURED F TO H SERVO CONNECTED F TO ALL 84 EXCEPT Y EN 1 CUSTOM CRUISE III GROUND do 18 INCI INSTALLATION DIAGRAM HTO SPSLOW MEASURED F AND H TO GROUND 25007482 26 INGE SPEED SIGNAL C3 EXCEPT 84C 84Y 84P CAR AND CHEVROLET BERLINETTA GROUND SERVO DISCONNECTED 25007463 32 INCH SPEED SIGNAL CRUISE NOTE REFER TO CHEVROLET SERVICE mec MANUAL FOR BERLINETTA K TO VACUUM VALVE MEASURED TO GROUND SERVO CONNECTED GROUND CONTROL MEASURED TO GROUND SERVO DISCONNECTED JTO GROUND GROUND MEASURED TO VEHICLE GROUND Figure 3 5 1984 Custom Cruise Ill System Schematic Optical Speed Sensor Buffer Assembly Identifies Vehicle Applications 3 5 3 6 3 How the System Op
13. N engine OFF and S C depressed S C light lights Vac light goes out Vac short light does not light Mode Control Switch Function Ign ON engine OFF and slider in R A position R A light lights Vent light goes out Vent short light does not light Table 4 4 Quick Checker Test Sequence 4 10 Check for shorted mode control switch and or related wiring Brake light OFF Check clutch and brake switches and related wiring ON OFF OFF Check for opens from fuse to Pin K of module Vent Vac or SPS lights OFF Check these solenoids or related wiring for continuity Replace bad servo Check sender wiring VSS wiring and connections Replace buffer amplifier or sender Mode control switch servo or related wiring bad Immediately check wiring between vac terminal at controller and vac terminal at servo for short to ground Mode control switch or related circuitry bad Immediately check wiring between vent terminal at controller and vent terminal at servo for short to ground 4 Diagnostic Procedures QUICK CHECKER TEST SEQUENCE continued Trouble Shooting for Vacuum System Check S C and R A lights Check for restricted or Start and run engine for Vent and Vac lights leaking vacuum source 1 minute to charge go out Servo will accumulator Turn full stroke and hold Engine OFF Ign ON Depress S C and R A toget
14. SMCM 1A 1984 AC CUSTOM CRUISE SYSTEMS SERVICE MANUAL E AC Spark Plug Division General Motors Corporation has prepared this service manual to help answer questions about operation and service of the 1984 AC Custom Cruise III cruise control system This system is offered in two versions AC Custom Cruise Ill and AC Integrated Custom Cruise Ill It is also referred to as Tri mode 3 Mode Cruise or the K 34 Cruise Option AC Custom Cruise III was introduced on 1983 Chevrolet and GMC trucks All 1984 applications except full size Cadillac use the AC Custom Ill system The Integrated Custom Cruise Ill system is used 1984 Corvette and the Pontiac Fiero P Custom Cruise III has electronic circuitry incorporated in a controller which is located under the dash The speed signal is m derived from the Vehicle Speed Sensor VSS speedometer buffer amplifier or a permanent magnet PM generator Integrated Custom Cruise III has the electronic circuitry incorporated in the instrument cluster The speed signal is ob tained from a VSS vehicle speed sensor speedometer and or a transmission driven permanent magnet PM generator fi Although the 1984 cruise function operates similarly in all applications there are system design differences which are explained in this service manual This service manual is intended to be a quick easy to use reference for servicing the 1984 Custom Cruise III system It has been organized i
15. e cruise function The cruise function remains disengaged after the clutch pedal is released J 2 Components in the System e Servo Unit The Servo figure 2 11 consists of a vacuum operated diaphragm a normally open solenoid valve to vent the dia phragm chamber to atmosphere a normally closed solenoid valve to connect the diaphragm chamber to the vacuum source and a variable inductance position sensor The servo operates the throttle in response to signals from the electronic controller as follows Steady State Cruise Function Both vacuum and vent valves are closed or sealed The servo has a constant vac uum on the diaphragm and places no flow requirements on the vacuum source Vehicle Losing Speed The controller energizes the vacuum solenoid to open the vacuum valve to the vacuum source This increases the vacuum level in the servo to increase the throttle angle the vent valve remains closed Vehicle Gaining Speed The controller de energizes the vent solenoid to open the vent valve to the atmosphere which reduces vacuum in the servo and allows the throttle return spring to decrease the throttle angle the vacuum valve remains closed VACUUM SOLENOID AND VALVE NORMALLY CLOSED VARIABLE INDUCTANCE POSITION SENSOR THROTTLE ATTACHMENT VACUUM SUPPLY PORT TO VACUUM SUPPLY VACUUM RELEASE PORT TO VACUUM BRAKE VNB andit RELEASE VALVE NOAMRULY INTERNAL
16. eps 1 8 Table 4 4 Test Sequence Pontiac Fiero Car Preparation 1 Disconnect edgeboard connector at instrument panel 2 Observing key slots connect optional Pontiac P Car adapter figure 4 6 to Custom Cruise III Quick Checker 3 Observing the key slots in the male end of the optional adapter fit male end to the female connector just re moved from the instrument cluster 4 Perform tests as outlined for the Quick Checker ex cept for step 4 5 To check the PM generator and the wiring to the clus ter proceed as follows Roll drive wheels at an estimated 8 to 10 MPH The LED molded into the lower end of the optional adapter should turn ON and OFF C Figure 4 6 Pontiac P Car Adapter 4 9 4 Diagnostic Procedures QUICK CHECKER TEST SEQUENCE Trouble Shooting for Test and Condition Correct Response Incorrect Response System Not in Use Ign ON engine OFF mode control switch OFF ON OFF and brake lights ON Note vent vac SPS also light Correct Power Source Mode control slider in ON position ign ON engine OFF System Continuity Ign ON engine OFF and slider in ON position All lights on except R A and SIC Vehicle Speed Sensor Performance Ign ON engine running slider in ON position vehicle moving at or a simulated 5 10 MPH VSS light should blink Mode Control Switch Function Ing O
17. er is in the ON position battery voltage is applied to terminal M e When the SET COAST button is depressed battery voltage is applied to terminal L e The controller sends a vent valve signal it flows from terminal C to terminal A at the servo unit then through the servo vent coil to servo terminal C then to Cruise Ground at the instrument panel e Servo terminals B D complete the SPS servo position circuit The servo position circuit originates at terminal F control module connector flows through servo terminal B through the SPS coil to servo terminal D then to terminal H at the control module connector The controller sends a vacuum valve signal which originates at terminal K and flows to servo terminal E through the servo vacuum coil to servo terminal C then to control module connector terminal J cruise ground at the l P instrument panel e A Cruise Lamp is used on some 1984 applications The control module connector terminal B figure 3 6 is used to ground the cruise lamp e Control module connector terminal J is Cruise Ground On 1984 Corvette figure 3 7 Cruise Ground is on terminal D 3 On Pontiac Fiero car figure 3 8 Cruise Ground is on controller terminal e Control module connector terminal D figure 3 5 is the speed sender terminal In operation voltage will oscillate be tween a high of 4 to 12 volts and a low of near
18. erates P E D CONN 12020651 P E D CONN 12034125 CLUTCH SWITCH BRAKE W LOCK PART NO OPTIONAL SWITCH 12020652 G BRAKE s A CRUISE ON OFF EH fi En L SET COAST CONTROL VENT VALVE MODULE F CONNEGIDRA H IGNITION AT FUSE BLOCK K THRU BULKHEAD CONN AT J FIREWALL e MOD SERVO Vi SPEED SENSOR CRUISE Lamp AT INSTRUMENT PANEL IGN 0 P E D CONN BIC 8917767 SPEEDO SPD SIG Leoni 1 112 HZ MPH 12020646 AUX SPD SIG 1 112 2 BUFFER ASM CRUISE SPD SIG 556 HZ MPH C3 SPD SIG 556 HZ MPH c3 POWER GROUND PART NO 25009914 SPEED SENSOR HI SPEED SENSOR LO CUSTOM CRUISE III PE T i INSTALLATION DIAGRAM B C 1984 A AND C CARS SPEED SENSOR PM GENERATOR A AND C AUTO TRANS 25007335 P AUTO TRANS 25007335 MAN TRANS 25007336 OTHER Y ALL 25007339 or 25007338 APPLICATIONS AUTO TRANS 25007338 MAN 25007350 Figure 3 6 1984 Custom Cruise Ill System Schematic and cars Speed Sensor PM Generator identifies other Vehicle Applications 3 7 3 How the System Operates NORMALLY OPEN CRUISE MODE CONTROL ENGAGE SWITCH 25031456 DELAY WIPER VOLTAGE CHECK MODULE CONNECTED SPECIFIED VOLTAGE TO TERMINAL FUNCTION BRAKE INPUT GROUND CRUISE ON OFF INPUT 25031457 2 SPEED WIPER TEST CONDITIONS BRAKE CLUTCH NOT APPLIED BRAKE CLUTCH APPLIED
19. etta perform the tests listed in Table 4 3 Mode Control Test Chevrolet Berlinetta SET COAST POSITION S C SW SLIDER EA o Closed Open C Table 4 2 Mode Control Switch Test TERMINAL B GREEN WIRE TOP 2 N TERMINAL A BLUE WIRE TOP 4 TERMINAL C YELLOW WIRE BOTTOM 1 N TERMINAL D RED WIRE BOTTOM 3 4 Diagnostic Procedures PERFORM WITH IGNITION AND CONSOLE ON OFF SWITCHES ON Resume Volts at Volts at Volts at Volts at Accelerator Cruise Power Set Coast Resume Accelerator Brake Switch With the console switch in the OFF position O volts should be indicated BRACKET STEERING COLUMN GREEN R A BLUE SET COAST YELLOW CRUISE POWER IGN ON C Table 4 3 Mode Control Test Chevrolet Berlinetta Applicable to 1984 Corvette Only Step 1 Refer to schematic figure 3 7 At test point V6 check for 12 volts clutch and brake not applied Step 2 Check vacuum release valve operation figure 2 6 Step 3 Inspect vacuum hose and fittings for restrictions and loose connections Step 4 Make sure electrical connections are not loose or defective Step 5 Perform servo electrical tests described in figure 4 1 Step 6 Check mode control switch per Diagnostic Procedures step 4 table 4 2 C Step 7 Check servo vacuum per Diagnostic Procedures step 2 table 4 1 4 5 4 Diagnost
20. from the electronic controller The servo in turn controls the throttle position The electronic controller receives input signals from the mode control switches brake release switch speedometer buffer amplifier and a feedback signal from the servo position sensor Figure 3 1 Block Diagram AC Custom Cruise Ill System Figure 3 2 shows the same block diagram as figure 3 1 except that the speed sensor is a PM generator which supplies a speed signal of 1 112 Hz per MPH to a buffer amplifier The buffer in turn divides the signal by two to provide a frequency of 0 556 Hz per MPH to the electronic control module for cruise operation THROTTLE Figure 3 2 Block Diagram AC Custom Cruise Ill System with Buffer Amplifier and PM Generator 3 1 3 How the System Operates System Configurations Figure 3 3 shows a typical AC Custom Cruise lll K 34 system installation HARNESS ASSEMBLY f VACUUM CHECK VALVE a SERVO VACUUM ACCUMULATOR ee a ADAPTER ELECTRONIC CONTROLLEA BRAKE PEDAL SPEEDO CABLE SPEED SENSOR SPEEDOMETER gt HARNESS lt gt CLUTCH ELECTRIC SWITCH VEHICLE SPEED SENSOR BUFFER gt AMPLIFIER BRAKE PEDAL RELEARE r HARNESS SWITCH STOP LP Sw BRAKE PEDAL CONNECTOR ACTUATOR BRKT BRAKE PEDAL CLUTCH PEDAL 3 2 3 How the System Operates Figu
21. heck vacuum hose routing as shown on the under hood decal service manual or applicable technical publication Correct as necessary Slow Engage Resume Response Step 1 Check for vacuum hose restrictions Step 2 Check for leaks in the vacuum system Step 3 Perform vacuum hose device repairs as necessary Step 4 Insure correct electronic controller P N has been installed Custom Cruise Ill System Quick Checker Three AC Custom Cruise Ill System Quick Checker test units are available see figures 4 3 4 4 and 4 5 1983 CUSTOM CRUISE III QUICK CHECKER 6 OF JON MOL yA f 22 v86l AVAILABILITY AVAILABILITY Owatonna Tool Co Kent Moore Tool Co 144 Wimbleton Dr 28635 Mound Rd Birmingham MI 48008 Warren MI 48092 313 642 7766 313 539 5330 Figure 4 3 Quick Checker Model No ET 3475 Figure 4 4 Quick Checker Model No J 34185 4 8 4 Diagnostic Procedures AVAILABILITY SPECMO Enterprises 2344 N Woodward Ave Royal Oak Mi 48073 313 399 5645 Figure 4 5 Quick Checker Model No QC111 Quick Checker Test Procedure Preparation 1 Remove kick pad to gain access to module controller if applicable 2 Depress harness connector locking tub and remove connector from module 3 Connect tester to harness connector Note 12 terminal edgeboard connectors mate to 1984 applications while 18 terminal connectors mate to 1983 applications 4 Perform St
22. her Vacuum should hold at full stroke servo position Plug vacuum release port figure 2 11 and proceed to step 8 Then release S C If it does replace or service vacuum release valve figure 2 6 or figure 2 8 Pontiac Fiero electric vacuum release valve and or related hoses Vacuum should hold at full stroke servo position Vacuum System Check Start and run engine for 1 minute to charge accumulator Turn Engine OFF Ign ON Depress S C and R A together If it does not replace Then release S C e AC Spark Plug AC Spark Plug Division General Motors Corporation 1300 N Dort Highway Flint Michigan 48556 U S A Printed in U S A SMCM 1A Litho in U S A 8 83
23. hicle will accelerate Release button at the desired speed and vehicle ACCELERATE speed will be controlled at this new desired speed E Momentarily tap the button several times Speed will be increased 1 mph for each tap TAP UP Figure 1 3 Electronic Cruise Control Operation 1984 Chevrolet Berlinetta 1 3 2 Components in the System A Component Functions Mode Control Switches Turn Signal Lever The various operating modes of the Custom Cruise Ill system are controlled by means of the Mode Control Switches normally located on the turn signal lever figure 2 1 Steering Wheel Custom Cruise III operating modes are controlled by Mode Control Switches built into the steering wheel on 1984 Chevrolet Berlinetta figure 2 1 ON OFF is a rocker switch on the floor console C MODE CONTROL STEERING WHEEL AND ON OFF ROCKER SWITCH FLOOR CONSOLE CHEVROLET BERLINETTA MODE CONTROL TURN SIGNAL LEVER Figure 2 1 Mode Control Switches C 2 1 2 Components in the System Figure 2 2 Typical VSS Buffer Amplifier OUTPUT CONNECTOR Figure 2 3 PM Generator Speed Sensor Figure 2 4 Electronic Control Module 2 2 gt VSS Buffer Amplifier Vehicle speed information is transmitted to the Elec tronic Controller by a speed sensor a Vehicle Speed Sensor VSS Buffer Amplifier See figure 2 2 The output of the VSS Buffer Amplifier is a frequency proportional t
24. ic Procedures 3 Step 8 Use speedometer Signal Generator J 33431 figure 4 2 to perform the following functional check Turn off the ignition switch then disconnect the body harness connector from the PM Generator at the transmission 8b Disconnect the servo throttle linkage at the servo unit 8c Connect Speedometer Signal Generator J 33431 to the PM Generator harness connector Use the connectors provided with signal generator 8d Set the tester to the 54 MPH position NSTAUMET PANEL TESTER gt z zh Figure 4 2 Speedometer Signal Generator J 33431 4 6 4 Diagnostic Procedures Step 9 Start the engine set the Mode Switch Slider to the ON position Go to Steps Ya b c and d Depress and release set coast switch S C Servo will pull to approximately 28 to 42 of servo position travel and hold Move cruise lever slider to Resume Ac celerate R A and hold for 3 seconds Release slider Servo will pull to the full stroke travel position and hold After releasing slider from the R A position the servo will return to 28 to 42 of the travel position Servo will move to the closed throttle position Depress brake and or clutch pedal Momentarily move cruise lever slider to Resume Accelerate R A position Servo will pull to the 28 to 42 position of travel and hold Step 10 Ifthe test
25. nto four major sections 1 HOW TO USE CUSTOM CRUISE Ill 2 COMPONENTS IN THE SYSTEM 3 HOW THE SYSTEM OPERATES 4 DIAGNOSTIC PROCEDURES o Important Safety Notice To reduce the chance of personal injury and or property damage the following instructions must be carefully observed Proper service and repair are important to the safety of the service technician and the safe re liable operation of all motor vehicles If part replacement is necessary the part must be re placed with one of the same part number or with an equivalent part Do not use a replacement part of lesser quality The service procedures recommended and described in this service manual are effective methods of performing service and repair Some of these procedures require the use of tools specially designed for the purpose Accordingly anyone who intends to use a replacement part service procedure or tool which is not recommended by the vehicle manufacturer must first determine that neither his safety or safe operation of the vehicle will be jeopardized by the replacement part service procedure or tool selected It is important to note that this manual contains various cautions and notices that must be carefully observed in order to reduce the risk of personal injury during service or repair or the possibility that improper service or repair may damage the vehicle or render it unsafe It is also important to understand
26. o vehicle speed The signal is a square wave with a frequency of 0 556 Hz MPH PM Generator Speed Sensor The PM generator speed sensor figure 2 3 gener ates vehicle speed information in the form of a sine wave with a frequency of 1 112 Hz MPH On Inte grated Custom Cruise III this signal is fed directly to the instrument cluster where is converted to 0 556 Hz MPH for cruise usage On Custom Cruise III K34 option it is fed to a buffer amplifier where it is con verted to 0 556 Hz MPH for cruise usage Electronic Control Module The Electronic Controller figure 2 4 contains a digital integrated circuit and supporting analog circuits The controller interprets the position of the servo unit the position of the mode control switches and the output of the speed sensor In response to these inputs the controller electrically signals the opening or closing of the vent and vacuum solenoid valves in the servo unit see figure 2 11 In Custom Cruise III applications the Electronic Con troller shown in figure 2 4 is usually mounted on some structural component under the dash On Integrated Custom Cruise Ill introduced on 1984 Corvette and Pontiac Fiero P car the electronic circuitry is built in the instrument panel e lt e Combination Vacuum Release Valve Converter Clutch Switch Vehicles equipped with a lock up torque converter locking clutch transmission use a Combination Vac
27. page 4 1 e Disconnect the bead chain cable or rod and electrical connector at the servo e Start the engine or apply vacuum to the servo vacuum port e Proceed to Test Table 4 1 Vacuum Servo Tests Servo should full stroke If not check Apply 12 volts to A and E then ground C vacuum hoses to the vacuum supply A C closes the normally open vent valve E C opens the normally closed vacuum valve The servo should hold a full stroke If not go to the next step On Pontiac Fiero replace the servo If servo holds go to step 4 Remove voltage from E Disconnect the vacuum brake release at the servo and plug the servo Momen tarily apply 12 volts to E to allow the servo to full stroke Turn Ignition ON Turn Ignition OFF and disconnect vacuum valve connector at the valve Turn Ign ON If the servo holds its position adjust the brake vacuum release valve or replace the valve Vacuum release valve should engage With a properly adjusted brake switch battery voltage should be present across the 2 connector terminals figures 2 8 and 3 8 No battery voltage indicates an open circuit see figure 3 8 Test Table 4 1 Vacuum Servo Tests C 4 3 4 Diagnostic Procedures Step 3 Check electrical operation of the mode control switches by replacing the switch with a known good switch or perform the tests listed in Table 4 2 Mode Control Switch Test For Chevrolet Berlin
28. ponents in the cruise system Things to check are e Disconnected or damaged wiring e Pinched cracked or disconnected vacuum hoses e Cracked or broken vacuum fittings at the servo or accumulator e Correct positioning of the check valve in the servo and accumulator vacuum line See figure 2 12 e Damaged components Inspection Notes 4 Diagnostic Procedures Test Procedures Cruise System Inoperative The following procedure applies to all Custom Cruise Ill systems except 1984 Corvette for Corvette see page 4 5 Step 1 Perform the voltage and resistance checks for the particular cruise system installation see figures 3 5 3 6 or 3 8 as appropriate e Servo resistance measurement vent valve control or vacuum valve control can be made at the servo as shown in figure 4 1 e SERVO CONNECTOR DISCONNECTED e MEASURE AT SERVO PINS EM FUNCTION RESISTANCE CONDITIONS MEASURED BETWEEN PINS D AND B IF MEASURED RESISTANCE IS NOT STATED VALUE REPLACE SERVO VENT VALVE MEASURED BETWEEN PINS A AND IF MEASURED RESISTANCE IS NOT STATED VALUE REPLACE SERVO VACUUM VALVE z MEASURED BETWEEN PINS E AND C IF MEASURED RESISTANCE IS NOT STATED VALUE REPLACE SERVO Figure 4 1 Servo Resistance Measurement 4 2 4 Diagnostic Procedures ga Step 2 Except for 1984 Pontiac Fiero car perform the following vacuum checks Vacuum Servo Tests e Perform Preliminary Inspection see
29. re 3 4 illustrates a typical AC Integrated Custom Cruise III System installation Note that the electronic circuitry is lo cated in the instrument display The speed sensor a PM Generator is driven by the transmission CONNECTOR TO ELECTRONIC CONTROLLER NSTRUMENT DISPLAY IN INSTRUMENT DISPLAY TO CONTROLLER WIRING HARNESS ZE EL i ake AN ACCELERATOR BRACKET ANO VACUUM RELEASE VALVES amp SWITCHES STOP LAMP SWITCH amp BRACKET TRANSMISSION TO ELECTRONIC CONTROLLER VACUUM ACCUMULATOR Figure 3 4 Typical Installation Integrated Custom Cruise Ill System Circuit Schematics The AC Custom Cruise III circuit schematic shown in figure 3 5 applies to all 1984 model A J and X cars ex cept Buick and Oldsmobile J cars and the Berlinetta car Figure 3 6 is the circuit schematic for 1984 model A and C cars figure 3 7 is the 1984 Corvette schematic figure 3 8 is for the 1984 Pontiac Fiero P car 3 3 3 How the System Operates Refer to figure 3 5 and figure 3 6 e When the ignition switch is ON battery voltage is applied to the Mode Control Switch and Buffer Amplifiers e When the slider switch is in the ON position battery voltage is applied to terminal A of the Control Module Connector If the brake and or clutch are not applied battery voltage is present at terminal G e When the R A Resume Accel slid
30. s performed in steps 9a b c and d did not meet specifications perform vacuum servo tests test table 4 1 If OK remove the cluster trim to expose the cluster and cluster connector 10a Perform voltage and resistance checks by back probing at the connector see figure 3 7 voltage and resistance specifications 10b If no defect is found replace the cluster assembly Performance Symptoms and Correction All Cruise Systems Cruise System Surges Step 1 The servo and throttle linkage should operate freely and smoothly This linkage should be adjusted as described by the vehicle service manual Hoses should be properly routed with no restrictions or leaks Step 2 Check the servo as per procedures described in figure 4 1 electrical check page 4 2 step 9 electrical vacuum check above and Table 4 1 Vacuum Servo Test page 4 3 Replace the servo if required Step If no system defect is noted replace the electronic controller or liquid crystal display Cruise Set Speed High or Low Step 1 Check module for correct part number see figures 3 5 3 6 3 7 or 3 8 as appropriate Step 2 Check servo linkage for excess slack and adjust Step 3 Insure correct electronic controller P N has been installed Step 4 Replace the electronic controller or instrument display 4 7 4 Diagnostic Procedures Excessive Cruise Speed Loss on Hills Step 1 Check hoses for vacuum leaks Step 2 Determine if check valve is functional Step 3 C
31. smaller fuel efficient vehicles AC Custom Cruise Ill places at the driver s command the cruise control functions of cruise coast resume speed tap up tap down and accelerate All functions except for 1984 Chevrolet Berlinetta are built in the turn signal lever figure 1 1 The 1984 Chevrolet Berlinetta has cruise control functions built in the steering wheel spoke the ON OFF switch is on the floor console figure1 2 Figure 1 1 Mode Control Switches on Turn Signal Lever RESUME ACCELERATE ON OFF ROCKER SWITCH ON FLOOR CONSOLE Figure 1 2 Mode Control 1984 Chevrolet Berlinetta Ti 1 How to Use Custom Cruise Ill Operation 1984 Vehicles Mode Control on Turn Signal Lever To engage the cruise mode the slide lever must be moved from the off to the on position and the set push button located in the end of the turn signal lever must be depressed and released The cruise set speed will be the vehicle speed at the particular time when the set push button is released However there is no cruise engagement below 25 mph This is a low speed inhibit feature The system may be disengaged by moving the mode control switch to the off position or by depressing the vehicle brake pedal or clutch pedal on manual transmission vehicles If the brake pedal is momentarily depressed to disengage cruise operation the cruise set speed will be retained in the system memor
32. that these cautions and notices are not exhaustive because it is impossible to warn of all the possible hazardous consequences that might result from failure to follow these instructions Table of Contents 1 How to Use Custom Cruise lll 1 1 mediani 1 1 Operation 1984 Vehicles 1 2 Mode Control Turn Signal Lever Tap up Tap down Feature 1 2 Mode Control 1984 Chevrolet Berlinetta 1 3 2 Components in the System 2 1 Component Functions 2 1 C Mode Control Switches 2 1 VSS Buffer Amplifier 2 2 PM Generator Speed Sensor 2 2 Electronic Control Module 2 2 Combination Vacuum Release Valve Converter Clutch S A ot dx T x 2 3 Vacuum Release Valve 2 3 Combination Vacuum Release Switch 2 3 Electric Vacuum Release Valve 2 4 C Combination Cruise Stop Light Switch 2 4 i e 2 4 I loh sm RI EP RENT 2 5 Vacuum Accumulator 2 6 Harness AddgiBl 2 6 3 How the System Operates 3 1 Electrical Vacuum System Operation 3 1 System Configurations 3 2 Circuit 5 lt 3 3 4 Diagnostic Procedures
33. y To return the vehicle to the previously set cruise speed MOMENTARILY move the slider to the R A Resume Accel position DO NOT HOLD THE SLIDER IN THE R A POSITION RELEASE IT IMMEDIATELY If the slider is held in the R A position for more than one second the system reverts to the ACCEL mode When the slider is released the speed the vehicle accelerated to becomes the new cruise speed The vehicle operator may erroneously interpret this as an inoperative resume function The vehicle will automatically accelerate to the previously set speed at a controlled rate The controller remembers the last cruise speed unless cleared by an on off of the ignition switch or the slider switch on the turn signal lever If the slider is moved to the R A position while in cruise and held the vehicle will accelerate at a controlled rate until the slider is released When the slider is released the vehicle will continue to cruise at that speed Reducing set speed can be accomplished by depressing and holding the SET COAST button on the end of the turn signal lever until the vehicle coasts down to the desired speed Vehicle speed at the moment of SET COAST button release is the new set cruise speed The accelerate function can be operated in either the cruise or non cruise modes Momentary slider switch movement to the R A position after an on off cycle will appear as a set cruise speed function Tap up Tap down Feature

Custom Cruise III System - 73

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