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Lada Niva 4x4 Service Manual Fuel Injection

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1. of actual engine revolutions per minute as received from the crankshaft reference input signal VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA aus UU f I ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 11 Often useful to detect if extra reference pulses are sus pected sudden high engine speed indication while at asteady throttle would indicate electrical interference in the crankshaft reference input signal circuit This inter ference is usually caused by electronic control module wires too close to ignition secondary wires or an open crankshaft reference low Circuit 58 wire DESIRED IDLE While the engine is idling the electronic control module is controlling idle speed Desired idie is the closed throttle engine speed that is commanded by the electronic control module COOLANT TEMPERATURE Displays the electronic control module s interpreta tion of coolant temperature in the engine The coolant temperature sensor is mounted in the engine and is wired to the electronic control module The electronic control module monitors the difference in voltage between two terminals and then converts the voltage to a temperature shown in degrees Celsius The reading should read close to the air temperature when the engine is cold and rise as the coolant temperature rises After engine is started the temperature should rise steadily to about 85 C 95 C then stabilize as the thermostat opens INTAK
2. When the diagnostic test terminal is not grounded this terminal will have 5 volts on it When the assembly line data link diagnostic test terminal is grounded the resulting zero voltage at the electronic control module causes it to operate in the Diagnostic Mode or the Field Service Mode depending if the engine is stopped of running VEHICLE SPEED INPUT SIGNAL The elec tronic control module sends a 12V signal volt age to the vehicle speed sensor The vehicle speed sensor pulses the signal to ground these pulses vary in frequency with the speed of the car COOLANT TEMPERATURE AND THROTTLE POSITION SENSOR GROUND This terminal should be nearly zero volts It is connected through the electronic control module circuitry to engine ground ELECTRONIC CONTROL MODULE GROUND This terminal has nearly zero voits It is con nected directly 10 the engine at the direct ignition system mounting bracket VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA i 4 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 25 BATTERY Power Supply This terminat B1 supplies the electronic control module with full time 12 volts It is hot even when the igni tion is tumed OFF It receives voltage through the fusible link This electronic control module terminal could be called the power supply and MEMORY terminal
3. Engine Management System Wiring Diagram 1 71 Throttle Body Injection NIVA 5 of 5 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 22 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 7 ELECTRONIC CONTROL MODULE CONNECTOR IDENTIFICATION CHARTS TBI ELECTRONIC CONTROL MODULE CONNECTOR IDENTIFICATION This electronic control module voltage chart is for use with a digital voltmeter to further aid in diag nosis The voltages you get may vary due to low battery charge or other reasons but they should be very close THE FOLLOWING CONDITIONS MUST BE MET BEFORE TESTING Engine at operating temperature e Engine idling For Engine column Diagnostic test terminai not grounded Tech 1 Scan tool not installed Air conditioning OFF Digital voltmeter negative lead connected to a good clean ground point DC VOLTAGE IGN ON ENG RUN CIRCUIT FUEL SYSTEM RELAY CONTROL NO CONNECTION VARIES 2 5 VARYING PULSE WIDTH MODULATED CANISTER CONTROL CHECK ENGINE LIGHT CONTROL IGNITION SWITCH VOLTAGE SIGNAL DIAGNOSTIC TEST TERMINAL INPUT SIGNAL COOLANT TEMPERATURE SENSOR amp THROTTLE POSITION SENSOR GROUND ELECTRONIC CONTROL MODULE GROUND CIRCUIT CRANKSHAFT REFERENCE INPUT SIGNAL NO CONNECTION NO CONNECTION AIR CONDITIONING REQUEST INPUT SIGNAL NO CONNECTION NO CONNECTION 1 5 VOLT 1 5 VOLT
4. OCTANE ADJUSTMENT INPUT SIGNAL 24 PIN A B CONNECTOR BACK VIEW CONNECTOR Battery voltage for first two seconds after ignition is turned ON without crank ing the engine When vehicle is stopped voltage will be either less than 1 volt or more than 10 volts depending upon posi tion of drive wheels When vehicle is moving voltage will vary depending upon vehicle speed Varies with temperature Varies With ignition ON reads barometric pressure With engine running reads engine load Voltage will vary with engine revolutions per minute Depending on octane adjust ment potentiometer trim bela voltage B with jine warm Less than 0 5 15 on cold engine Varas between battery volt age down to less than 1 volt depending 0 100 duty cycle of pulse width modulat ed control signal Less than 0 50 volt Less than 0 10 volt Should equal battery voltage ENGINE 1 71 Throttle Body injection NIVA Figure 2 7 1 ECM Connector Terminai End View 1 7L Throttle Body Injection 1 of 2 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA ENGINE MANAGEMENT SYSTEMS 1 7L THROTILE BODY INJECTION 2 23 DC VOLTAGE _ m NO CONNECTION INTAKE MANIFOLD ELECTRIC HEATER RELAY CONTROL Sy PN CD CONNECTOR USEABLE TOLE AIR CONTROL B USEABLE OLE AIR CONTROL COIL B GREENS HIGH WHITE USEABLE IDLE AIR CONTROL COIL Lo
5. ENGINE SPEED slama AX REFERENCE INPUT SIGNAL INJECTOR CONTROL CHART A 3 Page 1 of 3 ENGINE CRANKS BUT WILL NOT RUN Circuit Description Before using this chart check battery condition engi Test Description Number below refer to circi t fiumber s the diagnostic chart lt i a tis essential thar Check be performed first CHART A will deter mine if Electronic control module power and ground circuits are OK Electronic control module self diagnostic ability is oper ting poezija 4 Tech 1 5 4001 comimu electronic control mod le vak 2 If incorrect these sensor input signals 10 the elec ironic control module can cause a no start 3 Any time the electronic control module has been OFF for at least 15 seconds it energizes the fuel pump relay for 2 seconds after the ignition switch is nicate with the HART A Diagnostic Circuit there should be NO fuel delivered Rs This step checks for a short io ground on the injec 1 7L THROTTLE BODY INJECTION NIVA ning at the rear of vehicle This step checks for sufficient voltage at the Spark plug end of the spark plug wire Wire 1 and 2 must be tested individually Wire 1 and 2 connect 10 different ignition coils so both ignition coils are checked oo With the fuel injector elec tor control circuit If this occurs the engine would be flooded because the
6. Test Description Numbers s below refer to circled NOTICE If engine speed is indicated but less than number s on the diagnostic chart 80 check for and repair cause of low cranking s i speed 7 The electronic control module normally provides Y PR electrical pulses to ground to operate the fue 11 With the test light Satter bi incid injector This step checks for these electrical pulses Quickly repeatedly moment rily touching the refer while cranking the electtonic conttol 8 This step checks for fuel spray when injector ii receives the electrical pulses verified in Step 7 If F there is fuel spray See the next bottom box for possible causes Of a WIEL NOT RON 12 Jumpering the battery terminal to pin will 9 Incorrect fuel pressure can cause a WILL NOT power the injector with voltage See main wiring RUN If fuel pressure is OK the injector is faulty diagrams page 2 of 5 located in Section 2 of this 10 The electronic control module must receive refer manual Ai the injector harness connector only the ence signal input pulses from the ignition system Pink Black wire should have voltage to light the test to calculate any engine running functions The light Tech 1 will show the engine Speed if the electronic control module is receiving this reference signal VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY IN
7. 2 36 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION ASSEMBLY LINE DATA LINK CONNECTOR ENGINE ELECTRONIC CONTROL MODULE 57 BLACK WHITE MODULE GROUND front face view 1 BROWN DIAGNOSTIC TEST TERMINAL INPUT Sa BROWN ELECTRONIC CONTROL GROUND S x VAZ FUSE gk ENGINE INSTRUMENT PANEL HARNESS CONTROL ENGINE HARNESS CONNECTOR em 8 terminal white color NS 14330 38 BLACK WHITE CHECK ENGINE 9 15 92 CHART DIAGNOSTIC CIRCUIT CHECK 4 17L THROTTLE BODY INJECTION NIVA Circuit Description The diagnostic circuit check is an organized approach to identifying a problem created by an electronic engine control System malfunction It must be the starting point for any driveability complaint diagnosis because it directs the service technician to the next logical step in diagnosing the complaint Understanding the chart and using it correctly will reduce diagnosis time and prevent the unnecessary replacement of iu parts Test Description Number s below refer to circled shumber s on the diagnostic chart 1 86 followed by any This chetk is to ee if the bulbi is OK If the Check Engi will check for both ignition constant battery power 10 the electronic control module and the electronic control module grounds This check is done to sce if the electronic control module has the capability to control the Check Engine light
8. 8 terminal white color PINK BLACK 1 4 EVAPORATIVE EMISSIONS STORAGE CANISTER PURGE SOLENOID PULSE WIDTH MODULATED CANISTER CONTROL PINK BLACK PINK BLACK ruse R BLACK INTAKE MANIFOLD HEATER RELAY black connector INTAKE MANIFOLD ELECTRIC HEATER RELAY CONTROL 81 PINK BLACK 2 INTAKE MANIFOLD ELECTRIC HEATER 47 BLUE WHITE 48 BLUE BLACK 49 GREEN WHITE 50 GREEN BLACK COIL A HIGH Colt A LOW COLL B HIGH COIL B LOW IDLE AIR CONTROL VALVE 9 15 92 NS 15204 Engine Management System Wiring Diagram 1 7L Throttle Body Injection 4 of 5 VAZ SERVICE MANUAL THROTTLE 800Y INJECTION NIVA ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 21 ELECTRONIC ENGINE CONTROL MODULE FUSE AIR CONDITIONING HARNESS HARNESS AIR CONDITIONING IGNITION SWITCH COMPRESSOR sla AIR CONDITIONING MAIN RELAY AIR CONDITIONING x jes mer a 55 BLUE COMPRESSOR CLUTCH BLOWER Si 1 COMPRESSOR RELAY CONTROL E CONTROL RELAY i Vam 1 condmont ONTROL I AIR CONDITIONING 7 p REQUEST 1 INPUT SIGNAL E i 1 LIA tJ tid HULO REFRIGERANT HI COOLANT PRESSURE SWITCH TEMPERATURE E SWITCH r ENGINE e VAZ AIR HARNESS FUSE CONDITIONING i HARNESS CONDENSER FAN k CONDENSER FAN RELAY CONDENSER FAN
9. Idle air control valve moves 10 its fully extended position closing the idle air passage in the body injection unit Diagnostic trouble codes cannot be stored FIELD SERVICE MODE Similar to Diagnostic Display mode except with the engine running l Engine running 2 Tech 1 in the Fl Field Service mode This can also be done without the Tech 1 by using a jumper wire to connect the assembly line data link connec tor terminals A and B together When in the Field Service mode these actions lake place Electronic spark timing will be fixed at I0 before lop dead center when engine revolutions per minute are less than 2 000 idle air control valve will be commanded to a fixed position n the Field Service mode the Check Engine light will flash in a different manner Refer to Field Service mode explanation on Page 2 6 for informa tion about how the Check Engine light will flash in this mode TECH 1 FO DATA LIST PARAMETERS TECH 1 F0 DATA LIST When the Tech 1 1001 is connected and the data list mode is selected the data parameters are displayed in pairs The Tech 1 has preprogrammed data pairs If cus tom data pairs are desired any individual parameter be paired with any other parameter Refer to the Tech 1 owner s manual for further information about selecting customized data parameter pairs ENGINE SPEED Displays the electronic control module s interpreta
10. Only the parameters listed are used in this manual for diagnosing For more description on the typical data values to diagnosis electronic control module inputs refer to the General Description and System Operation Section 1 If alf data values are within the ranges illustrated refer to 2 B Symptom Charts Test Description Numbers Below a numbers on the diagn stic chan 1 The Scan position refers to the Tech 1 FO DATA LIST display pairs that are displayed in order if the YES button is pressed After Time From Start param ter is displayed by pressing the YES button the display pairs will start on the top of list again 2 Units Displayed are the available ways of dis playing what each parameter is currently Operating sain hat is being sensed or being These displayed values typical normally Operating vehicle The ignition ON comparison should be performed first as this may lead 10 a quick identification of a failure The Engine Running data should be compared to the ignition data as a diagnostic check to make sure the component or System is operating properly VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA abnormal state If th chart st ata Value is separated into two parts Operation Section 1 for more ENGINE RUNNING typical data values are an gniti n ON v lu s are th typical va
11. With the ssembly line data link grounded the Check Engine light will flash Code 12 at least three times ignostic codes stored in memory Code 12 means there is no crankshaft reference signal Coming to the clecuonic control module this is normal because the engine not running This check is used to sec if the electronic control module can supply serial data for Tech 1 Scan tool use If an engine calibrator error is present the electronic control module may have the ability to flash a Code 12 but not enable serial data This test is used to see if Cranks But Will Not Run sympiom is caused by an electronic control module problem or the vehicle electrical system 6 in normi engine not j ai the barometric pressure readirig from the manifold absolute pressure sensor voltage and kPa values Are they normal for your altitude se CHART D Look at th coolant temperature sensor value 19 sec if the value is reasonable or if i iti is shifted above below where it should be amp if the actual is not within the ty established the charts in Section 2 Systems Chants will provide a functional ch ck of the suspect component or system Diagnostic Aids If assembly line data link serial data output circuit Yeilow wire from electronic control module terminal AS to assembly line data link terminal M is shorted 10 12V there will be no serial data out
12. along with terminal C16 NO CONNECTION CRANKSHAFT REFERENCE LOW This terminal is always nearly zero volts It is connect ed through the ignition module to engine ground NO CONNECTION CRANKSHAFT REFERENCE INPUT S G NAL This terminal could be called the tach input It provides the electronic control module with revolutions per minute and crankshaft posi tion information With ignition ON but the engine not running the voltage is less than 1 volt As the crankshaft turns the voltage increases with revolutions per minute NO CONNECTION NO CONNECTION AIR CONDITIONING REQUEST INPUT SIGNAL When the instrument panel air condi tioning switch is OFF the voltage at this termi nal is near zero When the switch is ON a 12 volt signal is sent to the electronic control module NO CONNECTION NO CONNECTION NO CONNECTION B12 c1 OCTANE ADJUSTMENT INPUT SIGNAL The octane adjust potentiometer output voltage which depends on the potentiometer voltage adjustment is variable from 1 5 volts By moni toring this output voltage the electronic control module makes small changes in the total spark advance to allow for low octane fuel NO CONNECTION INTAKE MANIFOLD ELECTRIC HEATER RELAY CONTROL This terminal has battery voltage until the electronic control module ener gizes the relay by supplying the ground then the voltage is close to zero The input that causes the electroni
13. 1 Display a Code 12 by flashing the Check Engine light indicating the system is operating correctly 2 Display any stored codes by flashing the Check Engine light Each code will be flashed three times then Code 12 will be flashed again If no other codes are in the electronic control module s memo ry Code 12 will continue to flash as long as the diagnostic display mode is active 3 Energize the intake manifold heater relay air condi tioning clutch control relay and evaporative canister purge solenoid This allows checking circuits which may be difficult to energize without driving the vehicle and being under particular operating condi tions These relays and solenoids will remain ener gized as long as the electronic control module is in the Diagnostic Display mode including the intake manifold electric heater relay which causes a high electrical load due to the manifold heater operating current 4 Command the idle air control valve to fully extend to its zero step position shutting the idle air passage in the throttle body VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 56 2 6 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION FIELD SERVICE MODE If the diagnostic test terminal is grounded or Field Service mode is selected from Tech 1 with the ENGINE RUNNING the system will enter the Field Ser vice mode In this mode 1 The Check Engine light will not flash malfuncijon codes I
14. 167 AG DO ALL THREE TERMINALS LIGHT THE TEST LIGHT WITH TEST LIGHT CONNECTED TO 12 VOLTS BACKPROBE ELECTRONIC CONTROL MODULE TERMINALS t TAn K DO BOTH TERMINALS LIGHT THE TEST LIGHT JE TEST LIGHT IS CHECK FOR SHORTTO 12 VOLTS ON BLACKWHITE WIRE 38 BETWEEN TEST LIGHT AND CHECK ENGINE LIGHT REFER TO CHART A 4 IGNITION RELAY CIRCUIT CHECK REPAIR OPEN CIRCUIT IN GROUND WIRE THAT DIO NOT LIGHT TEST LIGHT roe CONNECTIONS OR FAULTY ELECTRONIC CONTROL MODULE VAZ SERVICE MANUAL THROTTLE BODY INJECTION 89 2 40 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC CONTROL MODULE ASSEMBLY UNE DATA LINK CONNECTOR front face view 57 BLACK WHITE BROWN ENGINE GROUND DIAGNOSTIC TEST TERMINAL INPUT ELECTRONIC CONTROL MODULE GROUND SERIAL DATA 62 YELLOW ag COMMUNICATIONS VAZ FUSE 38 BLACK WHITE INSTRUMENT PANEL HARNESS ENGINE HARNESS CHECK ENGINE UGHT CONNECTOR 8 terminal white color B CHART A 2 NO ASSEMBLY LINE DATA LINK SERIAL DATA OR WILL NOT FLASH CODE 12 CHECK ENGINE LIGHT ON STEADY 1 2 THROTTLE BODY INJECTION NIVA CHECK ENGINE LIGHT CONTROL 9 15 92 NS 14330 Circuit Description There should always be a steady Check Engine light when the ignition switch is ON and the engine is not running Switched ignition voltage is supplied directly to the
15. 71 THROTTLE BODY INJECTION 2 19 ELECTRONIC a H T CANISTER PURGE 1 MANIFOLD HEATER CONTROL MODULE SOLENOIDO 11 RELAY H VEHICLE SPEED VU COPS SENSOR isiacki BLACK 82 Pinky BLACK BLUE BROWN bp RA 29 PINKIBLACK VEHICLE SPEED SENSOR 27 PINK BLACK INPUT SIGNAL OXYGEN SENSOR 20 BROWN INPUT SIGNAL OXYGEN SENSOR GROUNO 52 BROWN 19 BROWN E ENGINE GROUND Attaches to engine at ignition module bracket ELECTRICALLY HEATED EXHAUST GAS OXYGEN SENSOR COOLANT TEMPERATURE ENGINE COOLANT INPUT SiG TEMPERATURE SENSOR INPUT SIGNAL COOLANT TEMPERATURE AND THROTTLE POSITION 72 PINK BLACK SENSOR GROUND THROTTLE POSITION THROTTLE POSITION SENSOR 36 BLUE INPUT SIGNAL 75 GRAY 45 VOLTS REFERENCE OUTPUT MANIFOLD ABSOLUTE PRESSURE SENSOR MANIFOLD PRESSURE INPUT SIGNAL MANIFOLD PRESSURE INTAKE AIR TEMPERATURE AND OCTANE ADJUSTMENT SENSOR GROUND INTAKE AIR Y TEMPERATURE SENSOR INTAKE AIR TEMPERATURE INPUT SIGNAL OCTANE ADJUSTMENT POTENTIOMETER INPUT SIGNAL OCTANE ADJUSTMENT POTENTIOMETER Engine Management System Wiring Diagram 1 7L Throttle Body injection NIVA 3 of 5 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 20 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC CONTROL MODULE CHECK ENGINE VAI FUSE CHECK ENGINE LIGHT 38 BLACK WHITE CONTROL INSTRUMENT PANEL HARNESS TO ENGINE HARNESS CONNECTOR
16. A 1 No Check Engine Light Chart A 2 No Assembly Line Data Link Serial Data or Will Not Flash Code 12 Check Engine Light ON Steady Chart A 3 Engine Cranks But Will Not Run Chart A 4 Ignition Relay and Power Circuits Check Chart 5 Fuel System Electrical Circuit Check Chart A 7 Fuel System Diagnosis Code 13 No Oxygen Sensor Signal Code 14 Coolant Temperature Signal Voltage Too Low Code 15 Coolant Temperature Signal Voltage Too High Code 21 Throttle Position Signal Voltage Too High Code 22 Throttle Position Signal Voltage Too Low Code 23 Intake Air Temperature Signal Voltage Too High Code 24 No Vehicle Speed Signal Code 25 Intake Air Temperature Signal Voltage Too Low Code 33 Manifold Absolute Pressure Signal Voltage Too High Code 34 Manifold Absolute Pressure Signal Voltage Too Low Code 35 Idle Speed Error Code 42 Electronic Spark Timing Control Circuit Problem Code 44 Lean Exhaust Indication Code 45 Rich Exhaust Indication Code 51 Calibrator Error Code 53 System Voltage Too High Code 54 Octane Adjustment Signal Voltage Too High or Too Low Code 55 Electronic Control Module Error VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 30 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 9 DIAGNOSTIC CHARTS DEFINED INTRODUCTION The diagnostic charts are designed to provide fast and efficient f
17. Check Engine light bulb The electronic control module will tum the light ON by supplying the ground path on electronic control module terminal AS When the electronic control module s diagnostic test terminal A9 is grounded the electronic control module commands the Check Engine light to flash a Code 12 followed by any code s stored in memory The Tech 1 Scan tool when the Fi Field Service key is pressed supplies a ground for assembly line data link t rmirial B lt Test Description Number s below refer to circled number s on the diagnostic chari 1 If Check Engine light is ON but very dim and 4 This step checks for an open circuit between assembly line data link connector terminal and electronic conirol module terininal 9 the engine will not stan check connections DI and A12 for proper tightness Also ensure that they are clean 5 At this point the Check Engine light wiring is OK The problem is a faulty electronic control module or engine calibrator If Code 12 does not 2 If the Check Engine light goes OFF when the 3 The electronic control module Code flash after replacing the electronic contro module ihen replace the engine calibrator also Diagnostic Aids A sicady light suggests a short to ground in the Check Engine light control circuit or an open in the diagnostic test terminal input circ
18. Circuit Check will lead to a diagnostic chart If the on vehicle diagnostics are working rectly the next step is 2 Is there a code stored If a code is stored go directly to the numbered code chart This will deter mine if the fault is still present If no code is stored then 3 Observe Serial Data information transmitted by the electronic control module This involves read ing the information available on the assembly line data link Serial Data Stream with a Tech 1 Scan tool Information on this tool and the meaning of the various displays can be found in the succceding paragraphs Typical data readings under a particular operating condition can be found in Section 29A Diagnostic Charts Tech 1 Scan Tool Typical Data Values VAZ SERVICE MANUAL THROTTLE BODY INJECTION 2 8 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 3 TECH 1 SCAN TOOL DESCRIPTION TECH 1 SCAN TOOL The electronic control module can communicate variety of information through assembly line data link connector terminal M This data is transmitted at a high frequency which requires a Tech 1 Scan tool for interpretation TECH 1 SCAN TOOL EXPLANATION explain how the Scan tool works lets think for a minute about how a television works A television is an electronic device that receives and processes infor mation and sends out information in a form that can be understood by the person watching it
19. Ic tont face view DIRECT IGNITION SYSTEM 9 14 92 NS 15206 ELECTRONIC CONTROL MODULE SERIAL DATA 62 YELLOW COMMUNICATIONS INJECTOR CONTROL CHART A 3 Page 3 of 3 ENGINE CRANKS BUT WILL NOT RUN 1 71 THROTTLE BODY INJECTION Circuit Description Before using this chart check battery condition engine cranking speed fuel quantity and quality Test Description Number s below refer to circled number s on the diagnostic chart 13 14 If the engine is too cold or too hot to properly test the fuel injector the test results would be invalid It is imperative for accurate test results that the injec tor temperature is between 10 C and 35 C This test uses the fuel injector tester J 39021 and the digital voltmeter J 39689 together The injector tester supplies one of three fixed amperage current values throughout the duration of the test Sclection of the correct supply amperage value of 4 amps is based on the injector coil s specified resistance when the push to test button 15 depressed tester energizes the injector solenoid coil for 5 seconds The condition of the injector solenoid coil is deter mined by the voltage displayed on the digital volt meter while the injector is energized The voltage reading displayed during the first second of the five second test should be ignored 15 16 This step checks that the injector control circuit Blue 64 wire is a complete
20. NOTHING IS CONSIDERED 15 THERE SPARK FROM BOTH SPARK PLUG LEADS 1 2 WHI DISCONNECT ELECTRICAL CONNECTOR FROM FUEL INJECTOR DOES FUEL INJECTOR SPRAY WHILE CRANKING ENGINE SEE FACING PAGE TEST DESCRIPTION STE EN TURN OFF 20 T4 4 SEE FUEL SYSTEM ELECTRICAL LORCUIT CHECK CHART ULE CRANKING TIGNITION SYSTEM PROBLEM 1 CHART C A 1 22222222 7 4 CIRCUIT TEST LIGHT TOOL J 34730 2A TO HARNESS C MEME i in SAGNITION IS TURNED ON Ss GB na YES AULTY INJECTOR AND OR O RING DOES NOT LIGHT CONTINUE TO PAGE 2 OF 3 LIGHT FOR APPROXIMATELY 2 SECONDS AFTER IGNITION IS TURNED ON THE GOES OUT REPAIR SHORT TO GROUND ON INJECTOR CONTROL CIRCUIT TO ELECTRONIC CONTROL MODULE CONNECTOR TERMINAL 016 VAZ SERVICE MANUAL THROTTLE BODY INJECTION 93 2 44 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC BOD CONTROL MODULE icf NEO front face view SERIAL DATA 62 YELLOW COMMUNICATIONS INJECTOR CONTROL DIRECT IGNITION SYSTEM gt lt 9 14 92 NS 15206 CHART A 3 Page 2 of 3 p ENGINE CRANKS BUT WILE NOT RUN 21 71 THROTTLE BODY INJECTION NIVA Circuit Description pnts Before using this chart ch ck battery condition engine Cranking speed fuel quahiity and quality
21. ON With the ignition ON and the engine not running the Check Engine light should be ON terminal 5 voltage is close to zero With the Check Engine light not ON the voltage at terminal AS is battery voltage IGNITION SWITCH VOLTAGE INPUT SiG NAL This is the turn on signal to the elec tronic control module from the ignition switch Circuit It is nor the power supply to the elec tronic control module it signals the electronic control module the ignition is ON The voltage equals battery voltage when the ignition switch is in either the run or crank position NO CONNECTION A8 A9 A10 A11 A12 SERIAL DATA COMMUNICATIONS From terminal A8 the electronic control mod ule sends out information data about its inputs and outputs to the assembly line data link termi nal M This data is sent as a string of rapidly changing voltage signals pulsed from high 5 volts to low 0 volts The Tech 1 Scan tool when connected interprets the varying square wave signal and displays the data The data is sent in a serial fashion that is one piece after the other until sil the information has been sent then the process begins again Voltage when measured with digital voltmeter will rapidly change between 1 and 5 volts DIAGNOSTIC TEST TERMINAL INPUT SIG NAL This terminal is connected to the assembly line data link diagnostic test terminal
22. The television receives a signal from a transmitting station that is not usable to the person The television processes it then sends the signal to a screen The person can then see the information that the television transmitting station sent The Scan tool is like the television because it also processes information sent to it by the electronic con trol module The information is sent out of the electronic control module to the assembly line data link connector terminal The Scan tool plugs into the assembly line data link connector and the information is sent to the tool on its cable The Scan 100 processes the information and sends the signal to a display screen on the tool Just like a television you can select which station that you want to see The difference is instead of seeing the picture on a television you see the dis play screen and the stations that you can select on Scan tool are the different input and output signals that are being processed by the electronic control module TECH 1 SCAN TOOL USES The Scan tool is a useful and quick way of com paring operating parameters of a poorly operating engine with a known good one For example a sensor may shift its value but not set a code Comparison with a known good vehicle may uncover this problem The Scan tool allows a quick check of sensors and Switches which are inputs to the electronic control mod ule The ele
23. been displayed the entire flashing sequence is repeated Assembly Line Data Link Connector is located above the Electronic Control Module which is mounted behind the left front kick panel DIAGNOSTIC TEST TERMINAL GROUND ASSEMBLY LINE DATA LINK CONNECTOR Front view DIAGNOSTIC DISPLAY MODE IGNITION ON ENGINE NOT RUNNING ASSEMBLY UNE DATA LINK DIAGNOSTIC TEST TERMINAL GROUNDED TMALFUNCTION CODES FLASH IN A SIMILAR MANNER CHECK ENGINE LIGHT FLASHES CODE 12 TO INDICATE ELECTRONIC CONTROL MODULE SELF DIAGNOSTIC ABILITY IS OK IF MALFUNCTION CODES ARE PRESENT THOSE CODES WILL FLASH AFTER CODE 12 FLASHES THREE TIMES EACH CODE FLASHES THREE TIMES 4398 NS 14398 FLASHING CHECK ENGINE LIGHT DIAGNOSTIC DISPLAY MODE VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA ra M ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 31 Each diagnostic chart uses 2 pages a trouble tree chart on the right side page anda facing page on the left side page The left side facing page contains pertinent information including malfunction code setting parameters and circuit diagrams Troubleshooting is performed by using the trouble tree page Extra information such as the reasoning behind certain tests will be listed on the facing page TROUBLE TREE BOXES WITH CIRCLED NUMBERS right side chart page are explained by the CORRESPONDING NUMBERED PAR
24. cause conditions that could be blamed incorrectly on the electronics the engine management system Low compression Vacuum leaks Exhaust system restrictions Incorrect valve timing caused by worn parts or incorrect assembly Poor quality fuel Ignored regular maintenance intervals The Importance of Having the Special Diagnostic Tools There are certain special diagnostic tools that are called out in the diagnostic procedures and charts These tools are designed for specific diagnostic uses and the service manual procedures and charts that call for their use are written to require having these tools available If the special diagnostic tools are not used where indicat ed most efforts to accurately diagnose problems with the engine management system will be extremely diffi cult if not impossible These special diagnostic tools have been carefully designed and selected and are available as a diagnostic tool kit through Kent Moore SPX Corporation Address FAX and phone numbers are supplied in Section 6 Special Tools of this man ual As 10 special tools it is important to remember that none of the special diagnostic tools will make you into a diagnostic genius No tool will ever replace human intellect Tools can t perform a diagnosis for you and they don t eliminate the need for diagnostic charts and service procedures All of the special diagnostic tools are just that tools Tools are used to help pe
25. circuit to the electron ic control module With the injector connected the voltage from the Pink Blue injector wire goes through the injector and through the Blue 64 wire to the electronic control module terminal D16 Electronic control module terminals D9 and D10 are connected by loop of wire ih the har ness If this loop breaks open the injector control circuits inside the electronic control module damage could result If circuit is shorted to voltage 12 volts the engine will not start VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 4 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 47 CHART A 3 EE Page 3 of 3 z ENGINE CRANKS BUT Mp0 WILL NOT RUN FUELINIECTOR TEST BE PERFORMED NEXT WITH ENGINE TEMPERATURE 1 71 THROTTLE BODY BETWEEN 10 C AND 35 C FOR ACCURATE INJECTOR TEST INJECTION NIVA IGNITION ON e CONNECT TECH 1 SELECT FO DATA LIST OBSERVE COOLANT TEMPERATURE e i COOLANT TEMPERATURE BETWEEN 10 C ANO 35 C INJECTOR MUST BE TESTED AT TEMPERATURES BETWEEN 10 C AND 35 C ALLOW THE ENGINE TO WARM OR COOL AS NEEDED IGNITION OFF CONNECT FUEL INJECTOR TESTER J 39021 POWER CABLE VEHICLE BATTERY SET THE TESTER ROTARY SWITCH TO THE INJECTOR COIL TEST 4 7 POSITION PLUG DIGITAL VOLTMETER J 39689 JEST EADS 41 2 INTO FUELINJECTO
26. control system and has sensors used to get information about engine operation and about the various systems it controls Details of basic operation are covered in Sec tion 1 General Description and System Operation The electronic control module has the ability to do some diagnosis of the engine management When it finds a problem it tums ON a CHECK ENGINE light on the instrument panel and a trouble code will be stored in the electronic control module memory This does not mean that the engine should be stopped right away but that the cause of the light coming ON should be checked as soon as reasonably possible DIAGNOSIS PROCEDURE This portion of Section 2 Diagnosis of the manual is divided into 5 parts They are INTRODUCTION This contains general informa tion about how to use this section A SECTION AND A _ CHARTS This is where all diagnostic procedures begin It contains the all important DIAGNOSTIC CIRCUIT CHECK charts about the Check Engine light what to do if the engine will not run and other general charts TROUBLE CODE CHARTS If the DIAGNOSTIC CIRCUIT CHECK reveals a trouble code set in the elec tronic control module s memory this is where the indi vidual trouble codes are diagnosed If more than one trouble code is stored always start with the lowest num ber before going to the next higher trouble code B SECTION DRIVEABILITY SYMPTOMS If no trouble cod
27. electronic control module has been removed or the Tech 1 diagnos lic tool has been used to clear codes When unexpect codes appear during the code reading process one can assume these codes were set by an intermittent mal function and could be helpful in diagnosing the system An intermittent code may or may not re set If is an intermittent failure a Diagnostic Code Chart is not used Consult the Diagnostic Aids on the page facing the diagnostic chart corresponding to the intermittent diagnostic code Symptom Charts Section 2 9B also covers the topic of Intermittents A physical inspection of the sub system often will reveal the prob lem NS 13194 Figure 2 2 1 Assembly Line Data Link Location View VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA pem p ETT p CT rs c r E ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 5 READING CODES The provision for communicating with the electron ic control module is the assembly line data link connec tor see Figure 22 1 The assembly line data link con nector is used by the assembly plant to receive electron ic control module information and to check the engine before the vehicle leaves the plant The code s stored in the electronic control module s memory can be read either through a Tech 1 a handheld diagnostic tool plugged into the assembly line data link connector or by counting the number of
28. flashes of the Check Engine light when the diagnostic test terminal B of the assembly line data link connector is grounded The assembly line data link connector terminal diag nostic test terminal is the second terminal from the right of the assembly line data link connector s top row The terminal is most easily grounded by connecting it to terminal connected to engine ground the terminal to the right of terminal B on the top row of the assem bly line data link connector Once terminals A and have been connected the ignition switch must be moved to the position with the engine NOT RUNNING At this point the Check Engine light should flash Code 12 three times consecutively This would be the following flash sequence flash pause flash flash long pause flash pause flash flash long pause flash pause flash flash Code 12 is not a trouble code Code 12 merely indicates that the electronic control module s diagnostic system is operating If Code 12 is NOT indicated a problem is present within the diagnostic system itself and should be addressed by consulting the Diagnostic Circuit Check chart in Diagnostic Charts Section 2 9 Following the flashing of Code 12 the Check Engine light will flash any trouble codes three times if any diagnostic trouble codes are present or it will sim ply continue to flash Code 12 If more than one diagnos tic trouble c
29. injector would spray fuel continuously without electronic control module control VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA pus Yo ERE og Be 4 m iem ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 43 O TO VERIFY THE ELECTRONIC CONTROL MODULE S SELF DIAGNOSTICS ARE WORKING THE CHART A DIAGNOSTIC CIRCUIT CHECK MUST HAVE FIRST BEEN PERFORMED THROUGH STEP S BEFORE USING THIS WILL NOT RUN CHART CHART A 3 Page 1 of 3 ENGINE CRANKS BUT WILL NOT RUN 1 71 THROTTLE BODY INJECTION NIVA SELECT FQ DATA LIST IGNITION ON ENGINE STOPPED CHECK ENGINE LIGHT SHOULD GE ON NOT ON RETURN TO CHART A DIAGNOSTIC CIRCUIT CHECK CONNECT TECH 1 SCAN TOOL ARE THE FOLLOWING PARAMETER VALUES WITHIN RANGE A COOLANT TEMPERATURE IF BELOW 20 SEE CODE 15 CHART FOR SENSOR RESISTANCES THROTTLE POSITION IF OVER 2 5 VOLTS WITH THROTTLE CLOSED SEE CHART 1 _ MANIFOLD ABSOLUTE PRESSURE SENSOR VOLTS 3 0115 SEE CHART C 10 DOESIT NO SPARK IGNITION OFF FOR 15 SECONDS i LISTEN FOR FUEL PUMP RUNNING WHEN IGNITION I SWITCHED FUEL PUMP SHOULD RUN FOR 2 SECONOS AFTER IGNITION ON USING ST 125 SPARK CHECKER TOOL 26792 CHECK FOR SPARK AT SPARK PLUG WIRES WHILE CRANKING A FEW SPARKS AND THEN
30. number s on the diagnostic chart 4 A previous test proved that power was available at the relay connector terminal 6 Gray Red wire This test will check if the Brown wire to relay ter minal 2 is a good ground circuit 5 This test checks the switch portion of the relay The Tech 1 Scan tool displays system voltage from the electronic control module s interpretation of the voltage level at terminal 6 This checks the Pink wire from the ignition relay blue connector to the fuse block Diagnostic Aids The intake manifold heater relay is the same as the ignition relay If the ignition relay fails the intake mani fold heater relay can be used to operate the vehicle until a replacement relay can be obtained VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA a
31. 14 D15 D16 NO CONNECTION AIR CONDITIONING COMPRESSOR CLUTCH RELAY CONTROL The electronic control module supplies the ground path on this terminal to energize the air conditioning com pressor clutch control relay The voltage is less than volt when the electronic control module energizes the relay but the voltage is also less than 1 volt if the electronic control module does not receive the Air Conditioning Request input voltage at terminal B8 NO CONNECTION NO CONNECTION NO CONNECTION FUEL INJECTOR CONTROL The voltage at this terminal comes through the injector which is connected to 12 volts With the ignition ON and the engine not running the voltage is equal to battery voltage With the engine at idle the charging system increases this battery voltage slightly With higher engin revolutions per minute or more engine load the increased injec tor pulse frequency and injector pulse width caus es voltage to be slightly less than at idle VAZ SERVICE MANUAL THROTTLE BODY INJECTION 2 28 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION BLANK VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA e 03 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 29 SECTION 2 9A DIAGNOSTIC CHARTS CONTENTS Diagnostic Charts Defined Tech 1 Scan Tool Typical Data Value Electronic Control Module Diagnostic Codes Chart A Diagnostic Circuit Check Chart
32. AGRAPH teft side chart page FACING PAGE TROUBLE TREE CHART PAGE COOLANT TEMPERATURE GNAL VOLTAGE LOW 121 THROTTLE BODY INJECTION NIVA CODE 14 COOLANT TEMPERATURE SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY IKJECTION MINA Circuit Description ie seca MAP amon a eevee coire et ME omami comet tad pics sra 1 de ales arn trap overt wate AE a as sec mp uri ania a Wem de sagt cedem d et eh da esto meta vi Mh mgl Pen re eras mori ue PTI a NUMAE Test Description s cnin va m da nena sk TYPICAL FACING PAGE TYPICAL DIAGNOSTIC CHART VAZ SERVICE MANUAL THROTTLE BODY INJECTION B yeso 21212 aem 81 2 32 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 9A DIAGNOSTIC CHARTS TECH 1 SCAN TOOL TYPICAL DATA VALUE The Tech 1 Scan Data listed in the table may be used for comparison after completing the Diagnostic Circuit Check and finding the on board diagnostics functioning Properly and no diagnostic codes displayed TECH 1 SCAN TOOL THAT DISPLAYS FAULTY DATA SHOULD NOT BE USED AND THE PROBLEM SHOULD REPORTED TO THE MANUFACTURER THE USE OF A FAULTY TECH 1 SCAN TOOL CAN RESULT IN MISDIAGNOSIS AND UNNECESSARY PARTS REPLACEMENT
33. E AIR TEMPERATURE Displays intake air temperature as interpreted by the electronic control module The intake air temperature Sensor is a thermistor and is mounted in the air cleaner THROTTLE POSITION Displays the throttle position sensor signal input to the electronic control module Values will be in voltage from which the electronic control module calculates the throttle opening The display is the electronic control module s inter pretation of the throttle position sensor input voltage With the throttle fully closed the voltage should be with in 0 25 1 25 volts and go up to about 4 5 volts at wide open throttle THROTTLE ANGLE Displays the electronic control module computed throttle angle as a function of the throttle position sensor input voltage see above 0 refers to a completely closed throttle while 100 is wide open MANIFOLD ABSOLUTE PRESSURE Displays the electronic control module s interpreta tion of the intake manifold absolute pressure Manifold absolute pressure sensor output voltage range is from zero to five volts but the normal operating range is from about 0 30 to 4 90 volts This value on the Tech 1 Scan tool cannot change until the engine is started even though the actual manifold absolute pressure sen sor output voltage can change With the engine running the voltage will be about 1 2 volts at idle As engine load increases this voltage also increases BAROMETRIC PRESSURE This paramet
34. JECTION 2 45 pI CHART 3 Page 2 of 3 LCONTINUED PAGE Y OF3 ENGINE CRANKS BUT WATCH INJECTOR TEST LIGHT WHILE WILL NOT RUN DOES TEST LIGHT BLINK 1 7L THROTTLE BODY INJECTION NIVA YES REMOVE INJECTOR TEST LIGHT FROM HARNESS CONNECTOR RECONNECT HARNESS CONNECTOR TO INJECTOR LOOK FOR FUEL SPRAY FROM INJECTOR DOES FUEL SPRAY WHILE CRANKING ENGINE YES ro CHECK FOR IGNITION OFF FOULED SPARK PLUGS INSTALL FUEL PRESSURE GAGE SEE CHART A 7 TO gt RESTRICTED EXHAUST SYSTEM REFER DETERMINE WHERE TO CONNECT FUEL PRESSURE GAGE TO CHARTE 1 IGNITION ON m INCORRECT FUEL OR WATER FOREIGN FUEL PRESSURE SHOULD BE 190 TO 210 kPa 27 6 TO 30 5 MATERIALIN FUEL 51 1 9 2 1 BAR D SPARK PLUG WIRES CROSSED 15177 CONNECTED INTO WRONG SPARK i INCORRECT FUELPRESSURE REFER TO HART Airs E zal 55 INADEQUATE ENGINE C SSION _ CONTROL MOOULE TERMINAL 1 DIAGNOSIS 0 09 AND D10 CIRCUIT 1 INSTALL TECH 1 SELECT FO DATA LIST MONITOR ENGINE SPEED WHILE HOLDING THE IGNITION SWITCH KEY IN THE START POSITION tS ENGINE SPEED INDICATING MORE THAN 80 WHILE CRANKING DISCONNECT TECH 1 SCAN TOOL DISCONNECT 6 PIN HARNESS CONNECTOR FROM IGNITION WITH FUSED JUMPER WIRE JUMPER THE 7 MODULE DE BATTERY TERMINAL TO PIN G OF THEASSEMBL
35. LE CONNECTIONS FOR ELECTRONIC CONTROL MODULE HARNESS CONNECTOR TERMINAL AG OPEN CIRCUIT OR SHORTTO e TESTUGHT SHOULD LIGHT GROUND IN CIRCUIT THAI DOES IT MOT LIGHT THE TEST rad MO ROUBLE FOUND NO LIGHT ON ONE OR BOTH k i FCONNNUE REPAIR OPEN OR SHORTTO 1 PAGE 2 OFZ Fra ORCUTT THAT DID m i F VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 99 2 50 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 28LACK FUSIBLE UNK 3RED H i e 5 GRAY RED t IGNITION ENGINE BLOCK GROUND INTAKE MANIFOLD HEATER FUSE MAXIFUSE Located near electronic control module ENGINE HARNESS FUEL PANEL Located under instrument panel rdg 1 1 ELECTRONIC CONTROL MODULE IGNITION RELAY blue connector IGNITION SWITCH VOLTAGE INPUT SIGNAL CHART A 4 Page 2 of 2 IGNITION RELAY AND POWER CIRCUITS CHECK 1 7L THROTTLE BODY INJECTION NIVA Circuit Description When the ignition switch is turned ON it activates the ignition relay and supplies voltage to the electronic con trol module The electronic control module will operate as long as voltage is applied to electronic control module ter minal 6 ignition switch voltage input signal during cranking or running The electronic control module terminals and C16 receive power directly from the battery through a fusible link Test Description Number s below refer to circled
36. MISCELLANEOUS TESTS After making that selection other menu selections can be chosen Each one is described below OUTPUT TESTS Intake manifold heater relay ON and OFF control Recommend to observe SYSTEM VOLT AGE while commanding the manifold heater to cycle ON and OFF System voltage should decrease slightly when the manifold heater is ON due to large current draw Air conditioning compressor clutch control relay ON and OFF command can be initiated Listen for the compressor clutch ertgagement with the engine at idle and air conditioning controls in the ON position Check Engine lamp ON and OFF control Evaporative Emissions storage canister solenoid ON and OFF control Recommended 10 operate engine until fully warm then observe CLOSED LOOP FUEL ADJUSTMENT as EVAP SOLE NOID is cycled ON and OFF Percentage of fuel adjustment XX should quickly change as canisteris purged of fuel vapors IDLE SYSTEM Idle control To exercise the Idle air control motor by changing the desired idle speed up or down The idle air control valve should track this com mand and engine specd should follow up or down if the idle air control valve is functioning properly 4 reset To reset the idle air control valve Should Cause the idle air control valve to fully extend to the zero 0 step fully shut position then retract 10 known position OCTANE ADJUST e This fun
37. N CIRCUIT IN THE WIRE LOOP BETWEEN ELECTRONIC CONTROL MODULE HARNESS CONNECTOR TERMINAL 097 TO 70107 2 8 93 NS 15803 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA as 2 48 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC 3 3 RED ELS CONTROL MODULE BRED 1 7RED 9 RED BATTERY H H TET 5 GRAY RED L IGNITION 1 i SWITH INSTRUMENT 1222222 4 PANEL E HARI ENGINE BLOCK GROUND CONNECTOR IGNITION RELAY blue connector INTAKE MANIFOLD HEATER FUSE MAXIFUSE Located near electronic control module ENGINE HARNESS 225 FUEL PANEL S Located under j instrument panel INTAKE MANIFOLD T HEATER RELAY BLACK GREEN YELLOW 15 PINK BLACK rA 1 4 mooute 1 MODULE at Ll 4 CHART 4 ne Paget of 2 IGNITION RELAY AND POWER CIRCUITS CHECK 5s 2 1 7L THROTTLE BODY INJECTION NIVA E 414 Circuit Description When the ignition switch is turned ON it activates the ignition relay and supplies voltage to the electronic con trol module The electronic control module will operatc as long as voltage is applied to electronic contro module ter minal ignition switch voltage input signal during ranking or running The electronic control module termniials BI a
38. NAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC CONTROL MODULE BATTERY BATTERY 53 BROWN ENGINE GROUND m i adi Attaches to engine at ignition module BROWN bracket ITE m E ipiis IGNITION SWITCH VOLTAGE INPUT SIGNAL Go ELECTRONIC CONTROL 01 MODULE GROUND TO TO e SSEMBLY LINE DATA 1 VEHICLE SPEEO t R SENSOR 1 CHECK ENGINE IGNITION CHECK ENGINE SWITCH UGHT CONTROL VAZ FUSE 38 BLACK WHITE INSTRUMENT PANEL HARNESS TO ENGINE HARNESS CONNECTOR 3 15 02 8 terminal white color NS 14333 CHART A 1 NO CHECK ENGINE LIGHT 1 7L THROTTLE BODY INJECTION NIVA Circuit Description There should always be a sicady Check Engine light when the ignition is ON and the engine is not running Switched ignition voltage is supplicd from VAZ fusc direcily to the light bulb The electronic control module will contro the light and tum it ON by providing a ground path through the Black White wire to electronic control module terminal 5 Test Description Number s below refer to circled Diagnostic Aids ud number s on the diagnostic chart df ignition switch voltage input circuit electronic l Step 1 checks the operation of ine control circuit control module Pink Black wire from electronic control wire to the electronic control module connector module terminal to Fuse Y is sho
39. NE DATA LINK TERMINAL OK ELECTRONIC CONTROL MODULE OR ENGINE CALIBRATOR I FAULTY IGNITION OFF DISCONNECT BOTH ENGINE CONTROL MODULE CONNECTORS IGNITION ON 1 CHECK ENGINE LIGHT ONI REPAIR SHORT GROUND IN CHECK 5 ENGINE UGHT CONTROL ORCUTT 38 BLACK WHITE WIRE BETWEEN CHECK ENGINE LIGHT AND ENGINE CONTROL MODULE CONNECTOR TERMINAL IGNITION OFF RECONNECT ENGINE CONTROL MODULE CONNECTORS IGNITION ON ENGINE NOT RUNNING BACKPROBE ENGINE CONTROL MODULE CONNECTOR TERMINAL AS WITH TEST LIGHT CONNECTED TO GROUND LEAVE CONNECTED DOES CHECK ENGINE LIGHT NOW FLASH CODE 127 EEZ PROBLEM 15 EITHER AN OPEN CIRCUIT 57 BLACK WHITE WIRE BETWEEN ASSEMBLY LINE DATA UNK CONNECTOR TERMINAL B ENGINE CONTROL MODULE CONNECTOR TERMINAL OR OPEN GROUND CIRCUIT 51 BROWN WIRE TO ASSEMBLY LINE DATA LINK CONNECTOR TERMINAL RCUIT CHECK Pt DIA jit CHECK CHART FLASH CODE 12 ATLEAST DOES CHECK ENGIR THREE TIMES YSTEM OK VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 91 2 42 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION ASSEMBLY LINE DATA UNK CONNECTOR face view CRANKSHAFT POSITION 42 VIOLET WHITE 9 14 92 NS 15206 ELECTRONIC CONTROL MODULE SERIAL DATA 2 YELLOW COMMUNICATIONS
40. O CONNECTION NO CONNECTION ENGINE 1 7L Throttle Body NO CONNECTION Injection NIVA INJECTOR CONTROL TR Figure 2 7 2 ECM Connector Terminal End View 1 7L Throttle Body Injection NIVA 2 of 2 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 24 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 8 ELECTRONIC CONTROL MODULE TERMINALS DEFINED ELECTRONIC CONTROL MODULE CONNECTOR VOLTAGES WITH EXPLANATIONS A1 A2 A3 A4 A5 A6 A7 FUEL SYSTEM RELAY CONTROL Tuming the ignition ON signals the electronic control module to energize 12V the fuel system relay If no crankshaft reference input pulses are received the electronic contro module turns OFF the relay When the electronic control module receives crankshaft reference input ter minal B5 the electronic control module tums the fuel pump relay back ON NO CONNECTION PULSE WIDTH MODULATED CANISTER CONTROL The electronic conuol module sup plies the ground circuit to energize the evapora tive emission storage canister control solenoid With the engine stopped this terminals should equal the battery voltage With the engine run ning the voltage will be between battery voltage and zero The voltage level will depend on the 0 100 pulse width modulated conuol signal sent to the canister solenoid NO CONNECTION CHECK ENGINE LIGHT CONTROL The electronic control module supplies the ground to tum the Check Engine light
41. OSTIC CIRCUIT CHECK instructs the mechanic what to do if this happens The Tech Scan tool has a few limitations If the Tech 1 Scan tool is displaying an electronic control module output function it displays only the command given by the electronic control module That does not mean that the desired action took place This is similar to the dashboard gearshift indicator on a vehicle with an automatic transmission Just because the gearshift point er indicates the transmission is in drive gear does not mean that the transmission is actually in that gear To be sure you must check the linkage and adjustment at the transmission When using the Tech 1 Scan tool to observe one of the electronic control module output functions such as intake manifold heater idle air con irol valve or canister purge the mechanic must not assume the indicated is the same as the actual 1f the Tech 1 Scan tool is displaying manifold heater as being ON but the manifold heater relay is disconnect ed or defective or if the heater element is burnt out the electronic control module has no way of knowing it The display may indicate the command is ON but the device may not be operating VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 60 2 10 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION The Tech 1 Scan tool saves time in diagnosis and helps to prevent the replacement of good paris The key 10 using the Scan t
42. PUT SIGNAL VP CONNECTOR 13 WHITE ELECTRONIC SPARK TIMING OUTPUT BYPASS MODE CONTROL REFERENCE INPUT SIGNAL REFERENCE LOW 39 GREGN WHITE 40 BLACK WHITE 42 VIOLET WHITE 58 BLACK RED CRANKSHAFT SENSOR ASSEMBLIES DIRECT IGNITION SYSTEM MODULE ELECTRONIC CONTROL MODULE GROUND ENGINE GROUND 53 BROWN Attaches to engine at 52 ignition module bracket harha BROWN Engine Management System Wiring Diagram 1 7L Throttle Body Injection NIVA 1 of 5 10 22 92 NS 14422 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 18 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ASSEMBLY LINE DATA LINK ENGINE GROUND Attaches to engine at ignition module bracket 62 FuseZ 15 RED 46 PINK BLACK 63 GREEN WHITI FUEL SYSTEM RELAY red connector passes F IGNITION ENGINE GROUND Attaches to engine at ignition module bracket 12 PINK BLACK IN TANK ELECTRIC FUEL PUMP and FUEL LEVEL SENDER ELECTRONIC CONTROL MODULE DIAGNOSTIC TEST TERMINAL INPUT SIGNAL SERIAL DATA COMMUNICATIONS FUEL SYSTEM RELAY CONTROL 1 MODULE NE OXYGEN Sexson INJECTOR CONTROL INJECTOR CIRCUIT CURRENT UMITER Engine Management System Wiring Diagram 1 7L Throttle Body Injection NIVA 2 of 5 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA F ENGINE MANAGEMENT SYSTEMS 1
43. R TESTER SET THE DIGITAL VOLTMETER TO MEASURE DC VOLTS acu DISCONNECT HARNESS CONNECTOR FROM FUEL INJECTOR USING TESTER ADAPTOR 5 39021 30 CONNECT FUEL INJECTOR TESTER CABLE TO FUEL INJECTOR FUELINIECTOR TESTER LOW VEHICLE BATTERY INDICATOR SHOULD NOT BE IS IT CHARGE VEHICLE BATTERY BEFORE PROCEEDING AS INJECTOR TESTER START TEST BUTTON IS PUSHED ONCE OMATICALLY BE TESTED FORS SECONDS DO NOT TEST MORE OFTEN THAN ONCE PER MINUTE i ANED SHOULD STAY BETWEEN 54 AND 8 5 VOLTS DC DISREGARD FIRST SECOND OF THE S SECOND TEST DOES VOLTAGE STAY BETWEEN 5 4 8 5 VOLTS lt 7 U FAULTY FUELINJECTOR DISCONNECT TESTERS RECONNECT HARNESS TO FUEL INJECTOR e DISCONNECT ELECTRONIC CONTROL MODULE CONNECTORS WITH A FUSED JUMPER WIRE JUMPER THE BATTERY TERMINAL TO PIN G OF THE DATA LINK CONNECTOR BACKPROBE ELECTRONIC CONTROL MODULE HARNESS CONNECTOR D16 WITH TEST LIGHT CONNECTED TO GROUND IS TEST LIGHT ON REPAIR CIRCUIT ON BLUE INJECTOR CONTROL CIRCU HARNESS CONNECTOR AND ELECTRONIC CONTROL MODULE TERMINAL 70167 REMOVE FUSED JUMPER WIRE FROM DATA LINK CONNECTOR USING A DIGITAL MULTIMETER J 39689 CHECK THE RESISTANCE BETWEEN THE ELECTRONIC CONTROL MODULE HARNESS CONNECTOR TERMINALS D9 ANO 0107 RESISTANCE SHOULD BE LESS THAN 1 OHM IS IT REPAIR OPE
44. RESSURE PRESSURE ALTITUDE THROTTLE POSITION VEHICLE SPEED KILOMETERS PER HOUR ms poe OXYGEN SENSOR MILUVOLTS LESS THAN 95mV to 950mV VOLTAGE 200 mV OPEN CLOSED CLOSED LOOP WITHIN 5 MINUTES AFTER ETE STARTING ENGINE YES NO YES SHOULD REMAIN YES AFTER STARTING READY ENGINE 5 EXHAUST GASES RICH LEAN VARIES WITH OXYGEN SENSOR S 14 INTERPRETATION OF EXHAUST GASES DECEL FUEL CUT MODE YES NO IN EFFECT REFER TO SECTION 1 2 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA a3 2 34 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION TECH 1 SCAN DATA D units TYPICAL DATA VALUE A C OFF ENGINE WARM 2 D SCAN POSITION DISPLAYED IGNITION amp ENGINE IDLING ADAPTIVE MEMORY 100 FLUCTUATES WITH CHANGE IN MEMORY FUEL FUEL ADJUSTMENT 100 ADJUSTMENT NORMALLY BETWEEN 10 AND 10 FUEL MEMORY CELL os CLOSED LOOP FUEL 100 0 FLUCTUATES WITH CHANGE IN CLOSED LOOP 4 100 FUEL ADJUSTMENT NORMALLY BETWEEN 20 AND 20 WHEN OPERATING IN CLOSED LOOP ADJUSTMENT SPARK ADVANCE BEFORE TOP NOT USEABLE VARIES DEAD CENTER TO n 60 BEFORE TOP DE D CENTER FUEL INJECTOR PULSE MILLISECONDS 3 9 OR HIGHER 8 TO 1 5 WIDTH CALIBRATION VARIES VARIES VARIES IDENTIFICATION ENGINE RUNNING TIME HOURS MINUTES USEABLE VARIES WITH TIME SINCE LAST START UP SECOND
45. S OLE AIR CONTROL COUNTS POSITION AIR CONDITIONING YES NO CHANGES WITH REQUEST FOR AIR CONDITIONING REQUEST SIGNAL AIR CONDITIONING ON OFF CHANGES WITH COMPRESSOR STATUS COMPRESSOR CONTROL RELAY OCTANE ADJUSTMENT VOLTS 00 VOLT 11 0 VOLT TO 4 7 VOLT DEGREES 8 0 TO 8 p IAE SEE EMISSION CANISTER PURGE DUTY CYCLE ON OR OFF DEPENDING ON COOLANT TEMPERATURE AND INTAKE AIR TEMPERATURE REFER TO SECTION un E ON OFF IMOMENTARILY THEN OFF RADIATOR FAN NOT USED NOT USED 4 27 93 5 14409 2of2 INTAKE HEATER CONTROL RELAY FUEL PUMP CIRCUIT VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 54 H cnp UT m ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 35 ELECTRONIC CONTROL MODULE DIAGNOSTIC CODES enu sea anale D YES YES a m ra m MANIFOLD ABSOLUTE PRESSURE Signal voltage too low IDLE SPEED ERROR LEAN EXHAUST INDICATION ae RICH EXHAUST INDICATION CALIBRATOR ERROR SYSTEM VOLTAGE TOO HIGH 522 1 ELECTRONIC SPARK TIMING Control Circuit problem 105294 OCTANE ADJUSTMENT CIRCUITS Signal voltage too high or too low NIC CONTROL MODULE ERROR VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
46. TURBONutter Lada Niva 4x4 Service Manual Fuel Injection This manual and a host of other wonderful Lada Niva documentation is available free of charge at http www turbo nutter com You can do anything you like with this manual except sell it or otherwise make money from it While can t stop you sticking it on your own website would much prefer you linked to its original location on turbo nutter com You use the information contained with this manual at you own risk If you re not sure how to do something either don t do it or ask someone who knows about such things The font of all Lada knowledge can be found at http www lada co uk forum For Lada parts advice and general all round Lada wonderfulness these blokes aren t bad Lada UK Ltd Lada Parts Australia P L Askew Rigg 42 Aerodrome Road Troutbeck Caboolture Penrith Cumbria Queensland 11 052 4510 United Kingdom Australia T 44 0 17 6877 9794 T 61 7 5495 5100 F 44 0 17 6877 9197 61 7 5495 5152 E alan lada co uk E andy ladaparts com W http www lada co uk W http www ladaparts com p f ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 1 2 DIAGNOSIS INTRODUCTION Diagnosing the electronic fuel injection and engine management system is fairly straightforward if you use a sound diagnostic procedure The first and foremost order of importance for diag nosing a problem with any type of system
47. Y LINK CONNECTOR CONNECT TEST LIGHT CLIPLEAD TO BATTERY TERMINAL IGNITION ON DISCONNECT FUEL INJECTOR OBSERVE TECH 1 ENGINE SPEED WHILEUSING TEST LIGHT WITH A TEST LIGHT CONNECTED TO GROUND TO QUICKLY ANO REPEATEDLY TOUCH TERMINAL 7E OF PIN TOUCH EACH DF THE Z TERMINALS OF THE HARNESS CONNECTOR REMOVED FROM IGNITION MODULE DISCONNECTED INJECTOR HARNESS CONNECTOR TECH 1 SHOULD INDICATE AN ENGINE SPEED ABOVE ZERO OBSERVE TEST LIGHT ON EACH TERMINAL DOES IT YES FAULTY CONNECTION PROBLEM IS EITHER A CIRCUIT FAULT ON OR THE REFERENCE INPUT SIGNAL DEFECTIVEIGNITION VIOLETAWHITE WIRE BETWEEN 6 PIN MODULE AGNITION MODULE CONNECTOR TERMINAL E TO LECTRONIC CONTROL MODULE 195 At DEFECTIVE ON ON ELECTRONIC CONTROL MODULE VERIFY TURNO Gre OPEN ROUND SHORT TO VOLTAGE IS PRESENT BEFORE REPLACING ELECTRONIC CONTROL MODULE e LIGHT ON ONE TERMINAL ONLY NO LIGHT EITHER TERMINAL LIGHT ON BOTH TERMINALS DISCONNECT FUSED JUMPER WIRE REPAIR OPEN CIRCUIT IN PINK BLACK REPAIR SHORT TO VOLTAGE ON BLUE m FROM DATA LINK CONNECTOR POWER SUPPLY WIRE TO INJECTOR INJECTOR CONTROL CIRCUIT WIRE 4 27 93 NS 14404 SERVICE MANUAL THROTTLE BODY INJECTION NIVA 96 2 46 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION ASSEMBLY LINE UNK CONNECTOR
48. as been requested to tum ON the air conditioning compressor clutch The display will show NO if the request signal is not received The signal is a 12 volt sig nal from the air conditioning control switches Before the signal is received at the electronic con trol module it must pass through the air conditioning high side high pressure switch and the air conditioning cycling switch If the switches are open the Tech 1 will display NO even though the air conditioning request Switch is closed AIR CONDITIONING ON OFF CLUTCH The display will show the electronic control mod ule s command to the air conditioning compressor con tro relay It will show ON if the electronic control module has commanded the relay to operate the com pressor and OFF if the electronic control module has not commanded the relay to operate the compressor Remember that the electronic control module command to the control relay is just that a command Do not assume that the compressor is running just because the command says ON FUEL PUMP CIRCUIT ON OFF Indicates whether or not the fuel pump circuit is energized This is a valuable display when diagnosing a Suspected fuel pump circuit failure CALIBRATION IDENTIFICATION The programmable read only memory is located inside the electronic control module and has information on the vehicle s weight engine transmission axle ratio and other items specific to each vehicle Th
49. ault location for the fuel System electronic spark timing system and all other engine functions associated with electronic control module Each diagnostic chart uses 2 pages a trouble tree chart on th right side page and a facing page on the left side page The left side facing page contains pertinent information including maifunction code setting parameters and circuit diagrams The trou ble tree boxes with circled numbers are explained by the corresponding numbered paragraph on the left side facing page it is essential that the charts be used correctly When diagnosing any problem ALWAYS BEGIN WITH THE DIAGNOSTIC CIRCUIT CHECK The Diagnostic Circuit Check will lead you into the other charts DO NOT GO DIRECTLY TO A SPECIFIC CHART or alse diagnosis and replacement of good parts could result After a fault is corrected and all codes have been cicared il is advisable to repeat the Diagnostic Circuit Check to ensure that proper repairs have been made When the electronic contro module is operating in the DIAGNOSTIC MODE the Check Engine light will flash stored malfunction codes Each code displayed consists of a number of flashes representing the first digit followed by short pause then a number of flashes representing the second digit followed by a longer pause indicating the end of the code Each stored code is displayed three times before proceeding to the next code After all codes stored in memory have
50. c control module to energize the relay is C10 COOLANT TEMPERATURE SENSOR The electronic control module also energizes the relay in the Diagnostic Mode ignition ON the engine not running with the assembly line data link diagnostic test terminal B jumpered to C3 C5 6 C10 IDLE AIR CONTROL COILS These termi nals are connected to the idle air control valve located on the throttle body It is difficult to pre dict what the voltage will be and the measure ment is not usable for service procedures NO CONNECTION NO CONNECTION NO CONNECTION COOLANT TEMPERATURE INPUT SIG NAL The electronic control module sends a 5 volt signal 10 the coolant temperature sensor a temperature variable resistor called thermistor The sensor also connected to ground varies the voltage based on engine coolant temperature As the engine coolant temperature increases the voltage on terminal C10 decreases At oc engine coolant temperature the voltage is above 4 volts AL normal operating temperature 85 C to 100 C the voltage is less than 2 volts VAZ SERVICE MANUAL THROTTLE BODY INJECTION 2 26 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION C11 C12 C13 14 MANIFOLD ABSOLUTE PRESSURE INPUT SIGNAL The voltage on terminal C11 varies with intake manifold pressure The sensor monitors intake manifold pressure by a small hose connected to the sensor from the throt
51. ction Unit Intake Air Temperature Sensor mounted in Air Cleaner not shown Vehicle Speed Sensor mounted under Vehicle to Transmission not shown 7 1 92 NS 14519 E ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 15 2 5 FUSEBLOCK VIEWS COLORS ARE SHOWN ON UNDERSIDE OF FUSE HOLDER FUSE IDENTIFICATION CHART 1 MAXI FUSE 2 MAXI FUSE CONNECTOR 3 KICK PANEL 4 DRIVER S DOOR Maxi Fuse Location View 1 FUSEBLOCK 2 STEERING WHEEL 3 DRIVER SIDE DOOR Fuse Block Location View VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 5 yeso 21213 2 16 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 6 RELAY CALLOUT AND LOCATION VIEW 1 FUEL PUMP RELAY RED 2 INTAKE MANIFOLD HEATER RELAY BLACK 3 IGNITION RELAY BLUE VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA ES ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 17 ELECTRONIC CONTROL MODULE BATTERY BATTERY E 1 D items So GRAY RED i IGNITION i SWITCH INSTRUMENT t MTOM A HARNESS CONNECTOR IGNITION RELAY blue connector GROUND BROWN INTAKE MANIFOLD HEATER FUSE MAXI FUSE Located near electronic control module ENGINE HARNESS FUSE PANEL Located under RED BLACK GREEN YELLOW instrument panet 14 PINK BLACK IGNITION SWITCH VOLTAGE IN
52. ction instructs the electronic control module to read store and use the current value of the octane adjustment potentiometer input signal This adjustment is usually set at the factory lo allow using high octane fuel An adjustment would be per formed if the customer desires to use low octane fuel When the Tech 1 is not commanding this func tion the octane adjustment input signal from the potentiometer is only used to determine if the circuit is good or faulty Refer to CHART C 15 Octane Adjustment for further information CLEAR CODES e This function will erase all stored diagnostic trouble codes from the electronic control module s memory without the need to either disconnect the battery or remove power from the electronic control module CRANK TEST This is a special test that monitors and records the engine cranking speed revolutions per minute bat tery voltage while cranking and could be useful in diagnosing a hard star engine that might be due to low engine cranking speed TECH 1 SCAN TOOL LIMITATIONS The Tech 1 Scan tool must receive the signal from the electronic control module in order to display any usable information If the electronic control module sends no signals to the assembly line data link diagnos tic connector or the connection 10 the Tech 1 is defec live the Tech 1 Scan tool will only display NO DATA RESELECT OR TURN OFF AND CHECK ASSEMBLY LINE DATA LINK CONNECTOR Thc DIAGN
53. ctronic control module in the vehicle sends out information to the Scan tool at a very fast rate and the display on the tool can update quicker than a digital voluneter The Scan too allows a mechanic to manip ulate wiring harnesses or components under the hood while observing the Scan readout This can help in locating intermittent connections TECH 1 SCAN TOOL USE WITH INTERMITTENTS The Tech Scan tool allows manipulation of wiring hamesses or components under the hood with the engine not running while observing the Tech 1 Scan 100 readout The Tech 1 Scan tool can be plugged in and Observed while driving the vetricle under the condition when the Check Engine light tums ON momentarily or when the engine driveability is momentarily poor If the problem seems to be related to certain parameters that can be checked on the Tech 1 Scan tool they Should be checked while driving the vehicle If there does not seem to be any connection between the prob lem and any specific circuit the Tech 1 Scan tool can be used to monitor each parameter watching for a peri od of time to see if there is any change in the readings that indicates intermittent operation The Tech 1 Scan tool can capture and store data when the problem occurs so it can be played back at a slower rate to determine what happened to the system This is called the SNAPSHOT mode The Tech 1 Scan tool is an easy way to compare the operat
54. d FUEL INJECTOR PULSE WIDTH The injector pulse width is the length of time in milliseconds the electronic control module is com manding the fuel injector on Injector ON time is how electronic fuel injection systems control fuel mixture air fuel ratio A longer ON time yields more fuel delivered and a richer mixture SPARK ADVANCE Displays the final total spark advance delivered to the spark plug OCTANE ADJUST This will display the voltage that the electronic con trol module is interpreting from the octane adjust poten tiometer This also displays the value of ignition timing retard as it relates to the voltage mentioned above IDLE AIR CONTROL POSITION 0 255 Displays the numbers that indicate what position the electronic control module has commanded the idle air control valve to be at The electronic control module moves the idle air control in steps and these steps are what is displayed on the Tech 1 Scan tool The num ber of steps or counts indicate how far open or shut the idle air passageway in the throttle body is Larger numbers mean a larger opening in the idle air passage way and a higher idle speed should occur After the engine starts the numbers should decrease as the engine warms to normal operating temperature With the engine idling in neutral and the air conditioning not ON the numbers should be between 5 and 50 steps Any thing that makes the engine work harder a
55. e is stored or a code is stored but proves to be only an intermittent condition this part will help the mechanic to find the problem Again all diagnostic procedures must begin with the DIAGNOSTIC CIR CUIT CHECK SECTION AND C CHARTS Component Systems This part contains general remove and replace information about the individual components in the engine control system It also contains service informa tion about those components This is where you would look to find information on the ignition system intake manifold electric heater system the fuel injector the air conditioning electrical control system and so on VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA tU p p o pr to poe ES OG pre pre ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 3 2 1 DIAGNOSTIC PRECAUTIONS The following requirements must be observed when working on vehicles Before removing any electronic control module system component disconnect the battery ground cable Never start the engine without the battery being solidly connected Never separate the battery from the on board electrical system while the engine is running When charging the battery disconnect it from the vehicle s electrical system Never subject the electronic contro module to temperatures above 80 i e paint oven Always remove control unit first if this temperature is to be exceeded Ensure that all cable
56. er represents calculated barometric air pressure based on the signal from the absolute pressure sensor when the ignition is first switched ON before the engine starts The electronic control module can update its baro pressure calculation when the engine is operating with the throttle nearly wide open at low engine speed Because barometric air pressure depends on altitude it may vary from 105 kPa at or below sea level to 60 kPa 4300 meters above sea level On the Tech 1 the calculated barometric pressure is displayed OXYGEN SENSOR VOLTAGE Displays oxygen sensor voltage in millivolts When the sensor is cold this voltage will be close to 450 mV As the sensor s electric heater begins to heat up the oxy gen sensor the voltage will fluctuate between 100 900 fnV when the engine is running If the engine isn t run ning but the ignition is ON the oxygen sensor voltage will slowly decrease to less than 200 mV EXHAUST GASES RICH LEAN This display will indicate if the electronic control module is interpreting a rich or lean exhaust signal from the oxygen sensor OXYGEN SENSOR READY YES NO This display will indicate whether or not the oxygen sensor is in the ready state Ready can also be inter preted as up to temperature OPEN CLOSED LOOP FUEL CONTROL Displays either Open Loop or Closed Loop depending on the state of the fuel control system Time since start up
57. f Its job is to give information to a mechanic about what is happening in the engine management system The assembly line data link connector is used by the assembly plant to perform end of line tests This connec tor can also be used by mechanics to monitor certain inputs and outputs as seen by the electronic control module The Tech 1 Scan tool reads and displays information serial data supplied to the assembly line data link connector from the electronic control module VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 7 DIAGNOSIS PROCEDURE In response to the Check Engine light or an owner complaint relating to engine performance ALL FAULT FINDING SHOULD FOLLOW THE DIAGNOSIS CHARTS BEGINNING WITH THE DIAGNOSTIC CIRCUIT CHECK DIAGNOSTIC CIRCUIT CHECK After the visual physical underhood inspection the Diagnostic Circuit Check in Section 2 9A is the starting point for all diagnostic procedures or finding the cause of an emissions test failure The correct procedure to diagnose a problem is to follow three basic steps 1 Are the on vehicle diagnostics working This is determined by performing the Diagnostic Circuit Check Since this is the starting point for the diag nostic procedures or finding the cause of an emis sions test failure always begin here If the on vehicle diagnostics aren t working the Diagnostic
58. hamess plugs are connected solidly and that battery terminals are thoroughly clean 7 The engine management system harness connectors are designed to fit only one way there are indexing tabs and slots on both halves of the connector Forcing the connector into place is not necessary if it is installed with the proper orientation Failure to match the indexing tabs and slots on the connector can cause damage to the connec tor the module or other vehicle components or systems Never connect or disconnect the electronic control module connectors when the ignition is switched ON Before attempting any electric arc welding on the vehicle disconnect the battery leads and the electronic control module connectors 10 When steam cleaning engines do not direct the steam cleaning nozzle at electronic control module system com ponents If this happens corrosion of the terminals can take place 11 Use only the test equipment specified in the diagnostic charts other test equipment may give incorrect results or damage good components 12 Make all voltage measurements using a digital voltmeter with an intemal impedance rating of at least 10 million ohms per volt 10 mQ volt 13 When a test light is specified a low power test light must be used Do not use a high wattage test light i e Headlight While a particular brand of test light is not suggested a simple check on any test light will ensure it is safe for electronic control
59. ing parameters of a poorly operating engine with those of a known good one For example a sensor may shift in value but not set a diagnostic code Com paring the sensor s readings with those of a known good vehicle may uncover the problem The Tech 1 Scan tool saves time in diagnosis and helps to prevent the replacement of good parts The key fo using the Tech 1 Scan tool successfully is the tech nician s ability to understand the system being diag nosed as well as understanding the Tech 1 Scan tool Operation and limitations The technician should read the Tech 1 operating manual to become familiar with the Tech 1 operation ADDITIONAL TECH 1 FUNCTIONS SNAPSHOT The Tech 1 tool has the ability to capture and store data parameters as they occur This data can then be replayed and studied to help you locate current and intermittent problems MISCELLANEOUS TESTS The Tech 1 Scan tool also has the ability to send signals to the electronic control module instructing the electronic control module to perform various functions Or tasks VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA poy 3 v3 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 9 This provides a quick way to determine if a device is operational or not Also included is a command to erase all stored diagnostic trouble codes from the elecuonic control module s memory Briefly stated one of the Tech 1 menu selections is called
60. is 10 under stand how that system is supposed to normally operate Whether it is an automotive system a heating system for a building or even a human biological system like your hean or lungs before attempts are made to repair problem it is crucial to understand what is normal and what is not normal In other words to be effective in diagnosing and repairing problems with the electronic fuel injection and engine management system it is important that you pos sess a good working knowledge of the system Having the proper diagnostic tools and reference materials available and attendance at training schools is a good method for planning to succeed when diagnosing problems or malfunctions with the engine management system This manual has a section specifically written to help in understanding how the system normally oper ates The first section of this manual Section 1 tided General Description and System Operation is a good place to begin your understanding of normat system and component operation Make sure you lake the time to read the material contained at least once The Importance of Mechanical Systems Don t forget undemeath all the wiring electronics sensors and actuators is a basic internal combustion engine The fuel injection and engine management Sys tem assumes that all of the engine s mechanical systems are functioning properly As a reminder here are a few basic engine items that might
61. is identifica tion is used to determine if the engine calibrator is the correct one for a particular vehicle TIME FROM START Time from start is available and is a measure of how long the engine has been running If the engine stops time from start will reset to 0 00 00 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 14 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 4 UNDERHOOD LOCATION VIEW COMPUTER HARNESS et C4 Electronic Controt Module Assembly Line Data Link Fuse Relay Block Cross Car Hamess Connector Fuel Pump to Electronic Control Module Connector Maxi Fuse MISCELLANEOUS Fuel Filter Fuel Pressure Tap Actual location may vary O CONTROLLED DEVICES 1 2 3 4 7 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA Fuel injector Idle Air Control Valve Fuel Pump Relay ignition System Coils Check Engine Light Intake Manifold Heater Relay Intake Manifold Heater Under Throttle Body Injection Unit Fuel Pump Under Access Panel in Storage Area Evaporative Emission Canister mounted inside of the Engine Compartment near the radiator 1 7L THROTTLE BODY INJECTION SS ZAINFORMATION SENSORS Crankshaft Position Sensor front of Engine near end of Crankshaft Manifold Absolute Pressure Sensor Coolant Temperature Sensor Throttle Position Sensor Octane Adjust Potentiometer Oxygen Sensor mounted in Exhaust Manifold below Throttle Body Inje
62. lues that should be seen oi the Tech Scan tool with whe x f ignition ON and engine riot running Te per t re ud sensors should be compared to the actual temperatures by letting the sensor sit ov might then comparing their values A difference of 5 C from the actual temperature may indicate a problem with the sensor Use the diagnostic aids chart for that sensor to compare the resistance to temperature values y te Some ON or OFF switches may hoit io ground dependitig upon the switch Refer to Genera average of display values recorded from normally Operating vehicles and are intended to represent what a nonmally functioning system would typically display a ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 33 TECH 1 SCAN DATA TYPICAL DATA VALUE OFF ENGINE WARM O UNITS SCAN POSITION DISPLAYED IGNITION ON ENGINE IDLING ENGINE SPEED REVOLUTIONS z SO FROM DESIRED IDLE 12 PER MINUTE DESIRED IDLE REVOLUTIONS VARIES ELECTRONIC CONTROL MODULE IDLE PER MINUTE COMMAND VARIES WITH TEMPERATURE COOLANT c SHOULD EQUAL TEMPERATURE ACTUAL TEMP INTAKE AIR VARIES WITH AMBIENT AND UNDERHOOD TEMPERATURE AIR TEMPERATURE MANIFOLD ABSOLUTE KPA VOLTS 75 TO 105 KPA DEPENDS ON BAROMETRIC PRESSURE AND PRESSURE 3 5TO 5 0 VOLTS ENGINE LOAD BAROMETRIC KPA VARIES WITH DEPENDS ON BAROMETRIC P
63. module circuit testing Connect an accurate ammeter such as the high impedance digi tal multimeter in series with the test light and power the test light ammeter circuit with the vehicle battery a Bop Mor If the ammeter indicates fess than 1 4 amp current flow 25 A 250 ma the test light is SAFE to use If the ammeter indicates more than 1 4 amp current flow 25 A or 250 ma the test light is NOT SAFE to use TEST UGHT BATTERY 14 Electronic components used in control systems are often designed to carry very low voltage and are very suscep tible to damage from electrostatic discharge It is possible for less than 100 volts of static electricity to cause dam age to some electronic components By comparison it takes as much as 4 000 volts for a person to even feel the zap of a static discharge There are several ways for a person to become statically charged The most common methods of charging are by friction and by induction An example of charging by friction is a person sliding across a car seat in which a charge of as much as 25 000 volts can build up Charging by induction occurs when a person with well insulated shoes stands near a highly charged object and momentarily touches ground Charges of the same polarity are drained off leaving the person highly charged with the opposite polarity Static charges of either type can cause damage therefore it is important to use care when handling and te
64. nd C16 receive power directly from the batiery through a fusible link Test Description Number s below tefet to ciicl d number s on th diagnosti ichant eir 1 Power is supplied from ihe battery through a fusible link directly to both terminals C16 of a 4 the electronic control module Diagnostic Aids 2 Ifthe ignition relay and the wiring that supplies The intake manifold heater relay is the same as the power to terminal A6 are okay the testlight ignition relay If the ignition relay fails the intake mani should light fold heater relay can be used to operate the vehicle until 3 Bauery voltage shouid be available at the ignition a replacement relay can be obtained relay s blue connector terminal 4 and 6 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 98 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 49 4 1 of 2 IGNITION RELAY AND POWER CIRCUITS CHECK 1 7L THROTTLE BODY T INJECTION NIVA USE SHOWN E TNE sm BLOWN e USE TEST LIGHT J 34142 8 WITH REPAIR 51 ORCUIT CUPLEAD CONNECTED TO GROUND PROTECIED Dey ruse m BACKPROBE ELECTRONIC CONTROL T MODULE CONNECTOR TERMINALS 7817 AND e TESTUGHT Shoto LIGHT ON BOTH TERMINALS DESM IGNITION SON CHECK ELECTRONIC CONTROL 2 M 1 WIES STDIGHT CLIPLEAD STILL CONNECTED TO GROUND BACKPROBE MODU
65. nd supplies 5 volts 10 the mani fold absolute pressure and throttle position sen sors C15 NO CONNECTION C16 BATTERY POWER SUPPLY See t rmi D1 D2 04 05 Bl ELECTRONIC CONTROL MODULE GROUND This terminal has nearly zero volts iris connected directly to the engine at the direct ignition system mounting bracket OCTANE ADJUST MANIFOLD ABSOL UTE PRESSURE AND INTAKE AIR TEM PERATURE SENSOR GROUND This ter minal is nearly zero volts it is connected through the electronic control module to engine ground ELECTRONIC SPARK TIMING OUTPUT This termina has very low voltage with the igni tion ON but the engine not running With the engine running at idle the voltage is slightly more than 1 volt As the engine revolutions per minute goes up this voltage increases IGNITION MODULE BYPASS MODE CONTROL With ignition ON and the engine not running this terminal has very low voltage When the electronic control module measures more than 500 revolutions per minute engine RUN threshold on B5 CRANKSHAFT REF ERENCE INPUT SIGNAL the electronic control module turns 5 volts to DS IGNITION MODULE BYPASS MODE CONTROL CIR CUIT 5 D6 OXYGEN SENSOR GROUND CIRCUIT This terminal should have zero volts It is con nected directly to the engine block at the ignition module bracket This terminal grounds the elec ironic control module circuitry for the oxygen sensor voltage monito
66. occurred and the vehicle should be taken for service as soon as rea sonably possible t does mean the engine should be stopped 1 displays diagnostic Codes stored by the elec tronic control module which help the technician diagnose system problems AS a bulb and system check the light will come ON with the ignition ON and the engine not run ning When the engine is started the light will tum OFF If the light remains ON the self diagnostic 1 TERMINAL 7B DIAGNOSTIC TEST TERMINAL 2 TERMINAL GROUND TERMINAL System has detected a problem If the problem goes away the light will tum OFF in most cases after 10 Seconds but a diagnostic code will be stored in the elec tronic control module s memory When the light remains ON while the engine is running or when malfunction is suspected due to a driveability or emissions problem a Diagnostic Circuit Check must be performed The procedures for these Checks are given in Diagnostic Charts Section 2 94 These checks will expose malfunctions which may not be detected if other diagnostics are performed of order INTERMITTENT CHECK ENGINE LIGHT In the case of an intermittent problem the Check Engine light will tum ON for at least ten 10 sec onds and then will tum OFF However th matching code will be stored in the memory of the electronic con trol module until the battery voltage to the
67. ode has been stored in the electronic control module s memory the codes will flash from the lowest to the highest with each code displayed three times CLEARING CODES To clear the codes from the memory of the electronic control module either to see if the malfunction will occur again or because repair has been completed there are two methods Either the electronic contro module power feed must be disconnected for at least ten 10 seconds or the Tech 1 diagnostic tool also has the abili ty to erase the diagnostic trouble codes from the elec tronic control module s memory without disconnecting the battery or any fuses The electronic control module power feed can be disconnected by removing the nega tive battery terminal When the battery terminal is dis connected other on board memory data such as preset electronic radio tuning is also lost NOTICE To prevent electronic control module damiage the ignition must be OFF when discon necting or reconnecting electronic control module power DIAGNOSTIC DISPLAY MODE When the diagnostic test terminal is grounded assem bly line data link terminal connected to A with the ignition ON and the ENGINE STOPPED the system will enter what is called Diagnostic Dis play mode This can also be done by using the Tech 1 tool in the F1 Field Service mode but with the engine not running In this mode the electronic control module will
68. ool successfully for diagnosis is the technician s ability to understand the system being diag nosed as well as an understanding of the Tech 1 Scan tool s limitations The following information will describe all of the Tech 1 Scan toot mode FO data list displays and how they help in diagnosis With an understanding of the data the Tech 1 Scan tool displays and knowledge of the circuits involved the Tech 1 Scan tool is useful in getting information which is difficult or impossible to get with other methods The Tech I Scan tool does NOT make using diag nostic charts unnecessary nor can it tell you exacily where a problem is in a circuit Most diagnostic charts incorporate diagnosis procedures that require the use of a Tech 1 Scan tool Figure 2 3 1 Tech 1 Scan Tool DIAGNOSTIC MODES The electronic control module and the Tech 1 tool have various modes for communicating information between themselves The following describes system Operation in the different modes DIAGNOSTIC DISPLAY MODE l Ignition ON engine not running 2 Tech 1 in the Fl Field Service mode but with the engine not running This can also be done without the Tech 1 by using a jumper wire to connect the assembly line data link connector terminals A and B together When in the diagnostic display mode these actions take place 7 Check Engine light flashes codes Cenain solenoids and relays are energized
69. or minor varia tions in the engine management system 10 improve driveability If the banery is disconnected to clear diag nostic codes or for other repair the learning process resets and begins again A change may be noted in the vehicle s performance To teach the vehicle ensure that the engine is at operating temperature The vehicle should be driven at part throttle with moderate accelera tion and idle conditions until normal performance returns Alt diagnostic procedures must always begin with the DIAGNOSTIC CIRCUIT CHECK Diagnostic procedures must begin with the Diag nostic Circuit Check which represents an organized approach for identifying system problems The DIAGNOSTIC CIRCUIT CHECK makes an initial check of the system and then will direct the mechanic to other charts in the book It must be used as a starting point for all procedures The entire book is set up in a specific order that is the DIAGNOSTIC CIR CUIT CHECK will lead the mechanic to other charts and those charts may lead to still other charts THE SEQUENCE MUST BE FOLLOWED The engine control System uses many input signals and controls many out put functions If the correct diagnostic sequence is not followed incorrect diagnosis and replacement of good parts may happen Diagnostic charts incorporate diagnosis procedures using a Tech 1 Scan tool where possible This Tech 1 Scan tool is a small hand held computer in itsel
70. oxygen sensor ready status and coolant temperature ail contribute to the change from Open to Closed Loop VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 61 2 12 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION CLOSED LOOP FUEL ADJUSTMENT This will display corrections made to the fuel injec tor pulse width based on the rich lean indication from the oxygen sensor signal As with memory fuel adjust ment the scale will be 99 to 99 MEMORY FUEL ADJUSTMENT indicates what state the fuel correction is in 0 is the middle with no fuel being reduced from or added to the injector pulse width calculations If fuel is being added to the system the display will read between 1 and 99 If fuel is being reduced the display will read between 1 and 99 MEMORY FUEL ADJUSTMENT CELL This display will indicate which memory fuei cell is currently being used AIR FUEL RATIO The amount of air compared to the amount of fuel in the air fuel mixture commanded by the electronic con trol module See Stoichiometric Ratio in glossary POWER ENRICHMENT MODE ACTIVE YES NO The display will indicate whether or not the fuel control system is in the power enrichment mode DECEL FUEL CUT MODE IN EFFECT YES NO Display indicates when decel fuel cut off mode is in effect EVAPORATIVE EMISSION CANISTER PURGE CYCLE Displays the pulse width modulation command 0 100 of the canister purge solenoi
71. put See CHART 2 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA x 4 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 37 CHART A DIAGNOSTIC CIRCUIT CHECK 17L THROTTLE BODY INJECTION NIVA IGNITION ON ENGINE NOT RUNNING NOTE CHECK ENGINE LIGHT FLASHING CODE 12 JUMPER ASSEMBLY LINE DATA LINK fuse CHART A 1 1 TERMINAL B7TO A fT DOES CHECK ENGINE LIGHT FLASH CODE 12 AT LEAST 3 TIMES Qs CHECK FOR GROUNDED DIAGNOSTIC TEST INPUT CIRCUIT BLACK WHITE WIRE TO ELECTRONIC CONTROL MODULE TERMINAL A9 USE WIRING DIAGRAM ON CHART L Tse CHARTA2 pcena T IN TECH 1 TOOL USE EXIT AND RETURN 4 Tusc CHART A O SCREEN TITLED SELECT MODE T NEXT SELECT F2 TROUSLE CODE ARE ANY TROUBLE CODES DISPLAYED ON TECH 1 TOOL PRESS EXIT KEY ONCE THEN SELECT FO DATA LIST COMPARE EACH TECH 1 PARAMETER WITH TYPICAL DATA VALUES SHOWN ON PAGES j ARE VALUES NORMAL AND OR WITHIN TYPICAL RANGES SV REFER TO APPLICABLE CODE CHART MORE THAN ONE CODE IS DISPLAYED START WITH LOWEST CODE NUMBER REFER TO COMPONENT SYSTEMS CHARTS SECTION 2 4 27 93 NS 14331 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 88 2 38 ENGINE MA
72. r inside the electronic con trol module SERVICE MANUAL THROTTLE BODY INJECTION NIVA i D7 D8 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 27 OXYGEN SENSOR INPUT SIGNAL With ignition ON and engine not running the volt age should drop from a starting point of approxi mately 0 450 volt to less than 0 200 volts The oxygen sensor is electrically heated When the engine is not running and the sensor is hot an abundance of oxygen in the exhaust manifold will be sensed and the sensor s output voltage would be less than 0 200 volts If the sensor s electric heater is malfunctioning the only voltage seen here with the engine stopped would be the reference voltage coming from the electronic control module This reference voltage is a steady 400 500 mV 0 400 0 500 volt With the engine running and after the oxygen sensor is hot the voltage should be rapidly changing somewhere between 10 1000 millivolts 010 1 00 volts NO CONNECTION D9 D10 INJECTOR CIRCUIT CURRENT LIMITER JUMPER The electronic control module s injector control circuit uses this jumper to com plete its path to ground through an intemal cur rent limiter If this jumper circuit is open or miss ing the vehicle will not start If the circuit is shorted to ground the vehicle may run but with reduced performance and poor driveability and would eventually cause the fuel injector to not operate 011 012 D13 D
73. rform various tasks Some tools such as the Tech 1 diagnostic tool or the digital volt ohm amp multimeter allow us a way to examine what is happening in an electrical or electronic circuit The Tech 1 diagnostic tool is by itself a small handheld computer and communicates with the electronic control module The Tech 1 allows us a way of seeing what the electronic control module is interpreting from its various input signals and a window to observe what commands are being sent to the various devices that are controlled and operated by the electronic control module Knowledge required It is NOT required that you fully understand how elec tronics and computers operate What is required is a basic working knowledge of applied electrical theory such as voltage current resistance and what happens in an open circuit and what happens in a shorted cir cuit You should also be familiar with interpreting a sim ple wiring diagram Also you should be familiar with how to use a digital volt ohm amp multimeter in various situations Of course it is assumed that you have a good understanding of how a basic automotive engine oper ales VAZ SERVICE MANUAL THROTTLE BODY INJECTION 2 2 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION The engine used in this vehicle has controls to reduce exhaust emissions while maintaining good drive ability and fuel economy An electronic control module is the heart of this
74. rted to voltage terminal AS the engine will not stop running and or the d sh lights 2 This step checks the clectronic control module is ON receiving power on its three power supply terminals If the Check Engine light is OFF and the test BI C16 and light is ON in Step 1 there may be a short to 12 volts 3 This step checks the electronic control modulc to between AS and the Check Engine light Check for engine block ground circuits on electronic control open wires bad connections or a bad bulb before module connector terminals A12 and DI assuming that there is a short to 12 volts VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA i 2 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 39 CHART A 1 NO CHECK ENGINE LIGHT 1 7L THROTTLE BODY INJECTION NIVA ARE FUSES OK REPAIR SHORT TO GROUND IN CIRCUIT WITH BLOWN FU ue m IGNITION TON ENGINE OFF WITH TEST LIGHT CONNECTEO TO GROUND SACKPROBE 7 ELECTRONIC CONTROL MODULE CONNECTOR TERMINAL AS OBSERVE CHECK ENGINE LIGHT IS THE CHECK ENGINE LIGHT ON e CHECK FOR FAULTY CHECK ENGINE LIGHT BULB AND CONNECTIONS mi CHECK FOR OPEN IN WIRE TO ELECTRONIC i CONTROL MODULE TERMINAL AS CHECK UP HARNESS CONNECTOR e um 9 WITH TEST LIGHT CONNECTED TO GROUND ELECTRONIC CONTROL MODULE TERMINALS
75. sting electronic components NOTICE To prevent possible Electrostatic Discharge damage Do Not touch the electronic control module connector pins or soldered components on the electronic control module circuit board Never disassemble the electronic engine controi module metal case except for the cali brator cover e When handling an engine calibrator do not remove the integrated circuit from carrier VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 4 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 2 DIAGNOSTIC GENERAL DESCRIPTION The diagnostic charts and functional checks in this manual are designed to locate a faulty circuit or compo nent through logic based on the process of elimination The charts assume the vehicle functioned correctly at the time of assembly and there are no multiple failures The electronic control module performs a continual self diagnosis on certain control functions This diag nostic capability is aided by the diagnostic procedures in this manual The electronic control module s language for communicating the source of a malfunction is a sys tem of diagnostic codes The codes are two digit num bers that range from 12 to 55 When 2 malfunction is detected by the electronic control module a code is scoredAogged and the Check Engine light is tumed ON CHECK ENGINE LIGHT The light is in the instrument pane and does the fol lowing e It tells the driver a problem has
76. t idle will cause this number to increase Remember this position shows the electronic control module command There is no way to verify that the actual idle air control position is equal to the command VEHICLE SPEED Displays the electronic control module s interpreta tion of vehicle speed as received from the vehicle speed sensor If this position indicates no vehicle speed zero but the speedometer shows otherwise then a Code 24 will eventually set Also useful in checking speedometer accuracy RADIATOR FAN This will display NOT USED on NIVA vehicles INTAKE MANIFOLD HEATER ON OFF RELAY 2 This will display the ON OFF status of the elec tronic control module control of this output SYSTEM VOLTAGE This will display the voltage of the battery as inter preted by the electronic control module from the termi nal which is connected to Switched 12V from the ignition switch VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA E H 1 4 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 13 AIR CONDITIONING REQUEST YES NO Displays when the operator has requested air condi tioning The display is the electronic control module s interpretation of the air conditioning request input signal lo the electronic control module The display will show YES if the electronic control module has 12 volts on this terminal indicating that the electronic control mod ule h
77. t will flash in a different manner telling the technician if the fuel control system is operating in the Operi Loop or Closed Loop mode If in the Closed Loop mode the flashing of the light will indicate if the exhaust is too rich too lean or in control The explanation of each of the 4 possibili lies follow TA Flashing Loop The Check Engine light will flash ON and OFF 2 5 times per second 5 times every 2 seconds 1B Flashing Closed Loop with fuel system operating normally The Check Engine light will flash ON OFF at a rate of once per second 1 Flashing Closed Loop but oxygen sensor input indicates a lean exhaust The Check Engine light will be OFF most or all of the time 1D Flashing Closed Loop but oxygen sensor input indicates a rich exhaust The Check Engine light will be ON most or all of the time 2 The electronic spark timing is fixed at 10 before top dead center when engine revolutions Per minute is less than 2 000 m air ontrol valve is iinimanided o a fixed number of steps 4 Preventany new diagnostic trouble codes from stor ing into memory See Sections 71 1 or 2 37 for additional informa tion on electronic control module modes of operation ELECTRONIC CONTROL MODULE ADAPTIVE LEARNING ABILITY The electronic control module has a learning abil ity which allows it to make corrections f
78. tle body With the ignition ON and the engine not running high manifold pressure the voltage is above 4 volts This is the barometric pressure measurement and this voltage changes with both barometric pressure and altitude When the engine is running at idle the manifold pressure is quite low due to engine vacuum therefore the voltage is also low 1 to 2 volts The voltage is variable mostly from engine intake manifold pressure changes but it can change wilh baromet ric pressure or altitude changes This is typically called the engine load input INTAKE AIR TEMPERATURE INPUT SIG NAL The electronic control module sends a 5 volt signal to the air temperature sensor a temperature variable resistor called a thermistor The sensor also connected to ground varies une voltage based on intake air temperature As the intake air temperature increases the voltage on terminal C12 decreases At 0 C intake air tcm perature the voltage is above 4 volts At normal operating temperature 85 C 10 100 C the volt age is less than 2 volis THROTTLE POSITION INPUT SIGNAL The throttle position sensor input voltage which follows actual throttle changes is variable rom 0 to 5 volts Typically the voltage is less than 1 volt at idle and 4 to 5 volts at widc opcn throttle 5 VOLTS REFERENCE This voltage is always nearly 5 volts with the ignition ON IL is a regulated voltage output from the electronic control module a
79. uit to the lectronic control module electronic control module connectors arc disconnected then the Check Engine iight control circuit 38 Black White wire to electronic control module terminal AS is noi shorted to ground but may not be able to output serial data to the assembly line data link connector terminal M If Tech 1 Scan 1001 does not display serial data AND the Check Enginc light is flashing Code i2 THEN check the Tech 1 Scan tool on a good vehicle If the Tech 1 Scan tool and the serial data Output Circuit are OK then the connections the electronic control module or the engine calibrator may be faulty VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA o e Ex F ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 41 CHART A 2 NO ASSEMBLY LINE D LINK SERIAL DATA R WILL NOT FLASH CODE 12 CHECK ENGINE LIGHT ON STEADY 1 71 THROTTLE BODY INJECTION IGNITION ON ENGINE OFF e ASSEMBLY UNE DATA LINK CONNECTOR DIAGNOSTIC TEST TERMINAL B NOT GROUNDED AND TECH 1 SCAN NOT CONNECTED TO ASSEMBLY LINE DATA UNK CONNECTOR I THE CHECK ENGINE LIGHT ON 4 CONNECTTECH THIS GROUNDS THE DOES CHECK ENG ASSEMBLY LINE DATA LINK DATA CHECK SERIALDATA COMMUNICATION ORCUIT 62 YELLOW WIRE FOR OPEN OR SHORT TO GROUND BETWEEN ELECTRONIC CONTROL MODULE aa AND ASSEMBLY LI
80. w USEABLE DLE AIR CONTROL COIL A HIGH BACK VIEW OF CONNECTOR NO CONNECTION COOLANT TEMPERATURE INPUT SIGNAL Battery voltage for first two MANIFOLD ABSOLUTE seconds after ignition is PRESSURE INPUT SIGNAL turned ON without crank INTAKE AIR TEMPERATURE ing the engine INPUT SIGNAL When vehicle is stopped volt age will be either less than 1 volt than 10 volts i depending upon position o drive wheels When vehicle is moving voltage will vary depending upon vehicle speed Varies with temperature Varies With ignition ON CIRCUIT reads barometric pressure With engine running reads ELECTRONIC CONTROL NET engine load ADJUST Voltage will vary with engine POTENTIOMETER Lid revolutions per minute LUTE 5 1 AND INTAKE AIR TEMPERATURE Depending on octane adjust SENSOR GROUND ment potentiometer trim Battery voltage B with engine warm Less than 0 5 volts on cold engine IGNITION MODULE BYPASS Varies between battery volt MODE CONTROL age down to less than 1 volt depending on 0 100 duty cycle of pulse width modufat 703 US f i m NO CONNECTION ed controi signal INJECTOR CIRCUIT CURRENT Less than 0 50 volt LIMITER JUMPER Less than 0 10 volt INJECTOR CIRCUIT CURRENT LIMITER JUMPER B Should equal battery voltage AIR CONDITIONING COMPRESSOR CLUTCH RELAY CONTROL B N

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