Lada Niva 4x4 Service Manual Fuel Injection
Contents
1. ENGINE IOLING IN NEUTRAL GEAR WITH PARKING BRAKE SET AIR CONDITIONING OFF CONNECT TECH 1 SCAN TOOL SELECT MISC TESTS THEN IOLE SYSTEM THEN IOLE CONTROL WITH THE THROTTLE REMAINING CLOSED COMMAND THE DESIRED IOLE SPEED THROUGH A RANGE FROM 700 DISCONNECT HARNESS CONNECTOR FROM THE IDLE AIR IGNITION OFF CONTROL VALVE AND INSTALL HARNESS CONNECTOR DISCONNECT THE HARNESS CONNECTOR FROM INTO MODE LIGHT FROM TESTER KIT J 39763 2120 THE IDLE AIR CONTROL VALVE ENGINE RUNNING USING TECH 1 COMMAND THE USING THE DIGITAL VOLT OHM MULTIMETER 2 DESIRED JOL SPEED THROUGH RANGE UP AND DOWN 139689 CHECK RESISTANCE ACROSS IOLE AM UCH NODE o gu t HE EE je SH 4 7 DHS BETWEEN IOLE AIR ATO ST AND 74 FAULTY CONNECTOR TERMINAL CONTACTS E CHECK RESISTANCE BETWEEN OPEN CIRCUITS INCLUOING IOLE CONTROL VALVE CONNECTORS TERMINALS B AND ANO D R TATANO CIRCUITS SHORTED GROUND OR Se Zon p ORCUT ARE ORCUIT REFER TO CHAGNOSTIC AIDS ON FACING PAGE AFTER ALLADLE AIR CONTROL TESTING 15 COMPLETE RESET THE IDLE AIR CONTROL VALVE ONNECT TECH 1 SELECT MISC TESTS THEN IDLE SYSTEM THEN IDLE RESET AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 9 syeso E 2 80 ENGINE MANAG2. The importance of this st p cannot be stressed too strongly it can lead to correcting a problem without further checks and can save valuable time BEFORE STARTING m check should include Electronic control module grounds for being clean tight and in their proper location Vacuum hoses for splits kinks and proper connections Check thoroughly for any type of leak or restriction Air leaks at throttle body mounting area and intake manifold sealing surfaces also check intake manifold Electric Heater s mounting bolts for proper tightness Tgnition wires for cracking hardness proper routing and carbon tracking Wiring for proper connections pinches and cuts If wiring harness or connector repair is necessary refer to Service Operations Section 3 for Correct procedure VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 97 INTERMITTENTS Page 1 of 2 Definition Problem may or may not turn ON the Check Engine light or store a code PRELIMINARY CHECKS e Perform the careful visual physical checks as described at start of Symptoms in this section DIAGNOSTIC CODE CHARTS IN DIAGNOSTIC CHARTS SECTION 2 9 A e DO NOT use th Diagnostic Code Charts in Diagnostic Charts Section 2 9 for intermittent problems The fault must be present to locate the problem If a fault is intermitt
3. on the diagnostic chart 1 Checks for proper fuel pressure and system tion tuming the ignition key to the ON posi tion you will be able to energize the fuel system for 2 seconds at a time 2 This step checks for leaks or loose connections between the fuel pressure test fitting and the throttle body injection unit This step will also determine if the pressure regulator is operating properly 3 This portion ensures no leaks or loose connections are present between the fuel pump and the fucl pres by applying battery voltage to the test terminal Sure test fitting This step will also determine if the fuel pump is operating properly Diagnostic Aids Improper fuel system pressure can result in one of the following symptoms Cranks but wil not run Cuts out may feel like ignition problem Poor fuel economy loss of power Hesitation Have an assisiant listen for fuel pump at rear of vehicle pump may not be audible inside vehicle VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA e Hi ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 53 CHART A 7 Page 1 012 FUEL SYSTEM DIAGNOSIS 17L THROTTLE BODY INJECTION NIVA FUEL TANK HAS SUFFICIENT FUEL AND FUEL QUALITY IS OK IGNITION OFF REMOVE FUEL TANK FILLER CAP TO RELIEVE ANY RESIDUAL TANK PRESSURE DISCONNECT 4 TERMINAL ELECTRICAL CONNECTOR AT FUEL PUMP CONNECTOR A
4. 1 Scan tool displays 130 C or above the temperature should rise steadily to about 85 95 the electronic control module and the coolant tem then stabilize when the thermostat opens pm ets e of i If Code 21 throttle position sensor is sa set 3 This tests for an open in the Circuit 31 Yellow wie check coolant temperature sensor and throttle position from the coolant temperature sensor to electronic sens r ground circuit Circuit 74 Green wire Circuit 72 control module terminal CIO When the Circuit Pink Black wire for faulty wiring or connections 31 Yellow wire is jumpered shorted to a good Check terminals at sensor for a good connection ground the electronic control module should see 3 Ee K low resistance voltage high temperature the Refer 10 Intermittents in Symptoms Section coolant temperature sensor circuit electronic con 2 9B VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 112 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 63 CODE 15 COOLANT TEMPERATURE SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA ON ENGINE RUNNING 4 CONNECT TECH 1 DISCONNECT COOLANT TEMPERATURE SENSOR USE CONNECTOR TERMINAL TEST ADAPTER om 135615 TO JUMPER HARNESS TERMINALS TOGETHER TECH 1 H0ULD DISPLAY 15706 HIGHER REMOVE JUMPER WIRE FAULTY CONNECTION MEME EAL TEST ADAFIEA KIT 35616 JUMPER THE CIRCUIT 31 YELLOW
5. ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE UGHT VAZ SERVICE MANUAL THROTTLE 8ODY INJECTION NIVA 5 27 92 NS 14981 curs AM gn epo MENS 7 3 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 95 SECTION 2 98 SYMPTOM CHARTS CONTENTS Important Preliminary Checks Before Starting Intermittents tof 2 Head Start Surges and or EES EE Lack of Power Sluggish or Spongy 1 06 2 Detonation Spark Knock 1 of 2 Hesitation Sag Stumbli Cuts Out Misses Poor Fuel Economy Rough Unstable or Incorrect idle Stalling 1 Of 2 Excessive Exhaust Emissions or 5 Dieseling Run Ot Backfire Electronic Control Module in Connector B Symptoms Chart Electronic Control Module Pin Connector Symptoms Chart Electronic Control Module Pin Connector D Symptoms Chart VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 145 2 96 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 148 IMPORTANT PRELIMINARV CHECKS Before using this section you should have performed the Diagnostic Circuit Check Verify the customer complaint and locate the correct symptom Check the items indicated under that symptom If the ENGINE CRANKS BUT WILL NOT RUN use CHART A 3 Several of the following symptom procedures call for a careful visual physical check
6. INJECTION NIVA FERRING TO FUEL PRESSURE RELIEF PROCEDURE IN SECTION 3 DISCONNECT FUEL RETURN LINE AT THE AREA WHERE THE RUBBER HOSE CONNECTS TO STEEL UNE INSERT RUBSER RETURM LINE HOSE SECTION IN AN APPROVED GASQUME CONTAINER PRESSURE IS BETWEEN 190 kPa 27 6 psi 1 9 bar ANO 210 kPa CHECK FOR RESTRICTED FUEL RETURN LINE FROM THROTTLE BODY TION UNIT 10 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 108 2 58 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION CANISTER PURGE SOLENOID ELECTRONIC 25 PINK BLACK CONTROL MODULE black fusehokder OXYGEN SENSOR INPUT SIGNAL OXYGEN SENSOR 20 BROWN 33 BROWN WHITE GROUND ELECTRICALLY HEATED EXHAUST GAS OXYGEN SENSOR ENGINE GROUND Attaches to engine at ignition module bracket CODE 13 NO OXYGEN SENSOR SIGNAL 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The electronic control module applies a reference voltage of approximately 450 millivolts between terminals D7 and D6 The oxygen sensor varies the voltage within a range of about 1 volt if the exhaust is rich and down through about 10 millivolt if exhaust is lean Code 13 is set when the voltage does not vary on Circuit 32 within a pre determined amount of time The sensor is like an open circuit and produces voltage when it is below 315 C An open sensor circuit or a cold sensor causes Open Loop operation The heater circuit of the oxygen sensor is tu
7. SIGNAL VOLTAGE TOO HIGH OR TOO LOW 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The octane adjustment potentiometer provides a voltage that changes with an adjustment screw The voltage is adjustable from about volt to about 4 7 volts Th engine must be running to allow the Tech 1 to read this voltage correctly The octane adjustment voltage acts as an ignition timing spark retard which allows for adjustments when low octane fuel produces spark knock Test Description Number s below refer to circled number s on the diagnostic chart 1 Code 54 will set if The octane adjustment signal voltage is less than 0 5 volts or greater than 4 9 volts for approxi mately 2 seconds 2 With the octane adjust potentiometer disconnected from the electronic control module the Tech 1 should read close to 5 volts Diagnostic Aids An open or short to ground in the octane adjustment circuit wires will result in a Code 54 and or Code 23 Code 33 Refer to Intermittents Section 29B in Symptoms VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA KEE 4 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 91 CODE 54 Page 1 of 2 OCTANE ADJUSTMENT SIGNAL VOLTAGE TOO HIGH OR TOO LOW 1 7L THROTTLE BODY INJECTION NIVA ENGINE IDLING CONNECT TECH 1 SCAN TOOL SELECT DATA UST DOES TECH 1 SCAN TOOL DISPLAY OCTANE ADJUSTMENT VOLTAGE LESS
8. The intake air temperature sensor is located in the air cleaner Test Description Number s below refer 16 circled gt number s on the diagnostic chart 1 Code 23 will set if Ignition ON OR Engine has been running longer than 29 seconds Intake air temperature sensor signal voltage indi cates an intake air temperature below 39 2 A Code 23 will set duc to an open sensor wire or connection This test will determine if the wiring and electronic control module are 3 This will determine if the signal Circuit 65 White wire or the intake air temperature sensor ground Circuit 69 71 Black wire is open Diagnostic Aids A Scan tool reads temperature of the air entering the engine and should read close t ambient air temperature when engine is cold and rises as engine comparument temperature increases A faulty connection or an open in Circuit 65 White wire or Circuit 69 71 Black wire will result in a Code 23 and or Code 33 Code 54 Refer to Intermittents in Symptoms Section 2 9B VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA mm 4 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 69 CODE 23 INTAKE AIR TEMPERATURE SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA J DOES TECH 1 SCAN TOOL DISPLAY INTAKE AIR TEMPERATURE 30 C coo 2 DISCONNECT INTAKE AIR CODE 2315 INTERMITTENT iF NO TEMPERAT
9. WIRE FAULTY COOLANT WHICH RUNS FROM THE COOLANT TEMPERATURE TEMPERATURE SENSOR TO ELECTRONIC CONTROL MODULE SENSOR TERMINAL C167 TO A GOOD GROUND XE AECH OISPLAY OVER 30C COOLANT TEMPERATURE SENSOR GROUND CIRCUIT CIRCUIT 72 PINK BLACK CIRCUIT 74 GREEN WIRE FROM THE COOLANT TEMPERATURE SENSOR THROTTLE POSITION SENSOR TO ENGINE CONTROL MODULE TERMINAL A117 AOR FAULTY ELECTRONIC CONTROL MODULE VAZ SERVICE MANUAL THROTTLE BOOY INJECTION NIVA 2 64 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC CONTROL MODULE H 1 ABSOLUTE MANIFOLD PRESSURE SENSOR 1 THROTTLE POSITION SENSOR WIDE OPEN THROTTLE POSITION SENSOR CONNECTOR front face view i BEER c THROTTLE POSITION EL mmus lt fa J matsen 72 PINKY SENSOR GROUND 9 15 92 NS 14341 THROTTLE POSITION SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The throttle position sensor provides a voltage signal that changes relative to the throttle blade Throttle position sensor signal voltage varies from about 0 25 to 1 25 volts at idle to about 5 volts at wide open throttle The throttle position sensor signal is one of the inputs used by the electronic control module for fuel control and for most of the controlled outputs Diagnostic Aids A Tech 1 Scan tool reads throttle position in volts With ignition ON or at idle throttle position sensor signal voltage
10. interpretation by the elec tronic control module With engine running check voltage at the battery Checks to see if generator is faulty at higher engine speed m Diagnostic Aids During the time the failure is present all electronic control module outputs except the fuel injector and fuel system relay will be disengaged to protect the hardware The setting of additional codes may result VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 138 ose T cm 5597 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 89 CODE 53 SYSTEM VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA 17 ENGINE RUNNING ATIDUE ALL ACCESSORY ELECTRICAL LOADS TURNED OFF NOTE SYSTEM VOLTAGE ON TECH 1 TOOL e CHECK BATTERY VOLTAGE AT BATTERY 6 RAISE ENGINE REVOLUTIONS PER L MINUTETO 2000 NOTE SYSTEM VOLTAGE VALUE ON TECH TOOL 342 SEE INTEKMITTENTS IN SYMPTOMS SECTION 72 87 AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE UGHT VAZ SERVICE MANUAL THROTTLE BODY INJECTION 2 90 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 59 GREEN OCTANE ADJUSTMENT POTENTIOMETER OCTANE ADJUST POTENTIOMETER CONNECTOR front face view CODE 54 ELECTRONIC CONTROL MODULE OCTANE ADJUSTMENT POTENTIOMETER INPUT SIGNAL 69 BLACK SENSOR GROUND gt 1 2 OCTANE ADJUSTMENT
11. low regulated fuel pressure water in the fuel or a restricted injector System too rich Low Air Fuel Ratio The idle speed will be too low Tech 1 Scan tool idle air control counts will usually be above 80 System is Obviously rich and may exhibit black smoke in exhaust Tech 1 Scan tool oxygen voltage will be fixed above 800 mV 8 volt Check for high fuel pressure leaking or sticking injector Silicone contaminated oxygen sensors Tech 1 Scan tool voltage will be slow to respond Throttle Remove idle air control valve and inspect bore for foreign material B Air Control Valve Electrical Connections Kdle air control valve connections should be careful ly checked for proper contact Crankcase Ventilation System An incorrect or faulty positive crankcase ventilation system may result in an incorrect idle speed Refer to CHART C 13 Refer to Rough Unstable Incorrect Idle or Stalling in Symptoms Section 2 9 If intermittent poor driveability or idle symptoms are resolved by disconnecting the idle air control carefully recheck connections valve terminal resis tance or repiace idle air control VAZ SERVICE MANUAL THROTTLE 8ODY INJECTION NIVA S ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 79 m i F CODE 35 IDLE SPEED ERROR 1 7L THROTTLE BODY INJECTION NIVA amp ENGINE NORMAL OPERATING TEMPERATURE 85 95
12. pressure is 100 high The electronic control module can com pensate for some increase However if it gets too high Code 45 be set Check pinched fuel return line or plugged vac uum hose to fuel pressure regulator See Fuel Sys tem Diagnosis CHART A 7 Leaking Injector Refer to CHART A 7 Check for fuel contaminated oil Canister Purge Check for fuel saturation If full of fuel check canister control and hoses Refer to CHART C 3 Manifold Absolute Pressure Sensor Check for a shifted sensor that could cause a rich exhaust but not set a Code 33 or 34 Refer to CHART CAD VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 85 CODE 45 RICH EXHAUST INDICATION 1 7L THROTTLE BODY INJECTION NIVA SING CONNECTOR TERMINAL TEST CODE 4S ts INTERMITTENT ADAPTER KIT 35616 DISCONNECT Y NO ADOMONAL CODES WERE OXYGEN SENSOR AND JUMPER HARNESS STORED REFER TO DIAGNOSTIC be RI S AIDS ON FACING PAGE 15HOUL DISPLAY OXYGEN SENSOR RU S VOLT 350 mV REFER TO DIAGNOSTIC REPLACE ELECTRONIC AIOS ON FACING PAGE CONTROL MOOULE AFTER REPAIRS START ENGINE CLEAR CODES AND CONHRM NO CHECK ENGINE LIGHT VAZ SERVICE MANUAL THROTTLE BODY INJECTION 135 E BODY INJECTION ENGINE MANAGEMENT SYSTEMS 1 7L TH CODE 51 CALIBRATOR ERROR E 4 7L THROTTLE BODY INJECTION N
13. stiould read between 0 25 to 1 25 volts with the throttle closed and increase at a steady rate as throttle is moved toward wide open throttle An open in coolant temperature sensor and throttle position sensor ground circuit Circuit 72 73 Pink Black wire from throttle position sensor connector terminal to elec Test Description Number s below refer to circled number s on the diagnostic chart l 21 will set if Throttle position sensor signal voltage is greater than 2 56 volts Manifold absolute pressure is less than 47 kPa Engine speed 15 less than or equal to 2000 revo lutions per minute All conditions met for 2 seconds 2 With the throttle position sensor disconnected the throttle position sensor signal voltage should go low ifthe electronic control module and wiring are OK 3 Probing coolant temperature sensor and throttle position sensor ground circuit Circuit 72 73 Pink Black wire from throttle position sensor con nector terminal to electronic control module ter minal A11 with a test light to 12 volts checks the sensor ground circuit A faulty sensor ground can cause a Code 21 tronic control module terminal A11 will result in a Code 21 Refer to Intermittents in Symptoms Section 2 9B VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 114 E ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 65 IGNITI
14. CCESS PANEL IS LOCATED IN FLOOR PAN DIRECTLY ABOVE FUEL TANK START ENGINE AND IOLE UNTIL ENGINE STALLS ENGAGE STARTER FOR 3 SECONDS TO RELIEVE ANY REMAINING PRESSURE 4 DISCONNECT FUEL SUPPLY PRESSURE PIPE FROM FUEL FILTER OUTLET FITTING INSTALL FUEL PRESSURE TEST FITTING TOOL 138970 V BETWEEN FUEL FILTER OUTLET FITTING AND FUEL PIPE SEE FACING PAGE ILLUSTRATION INSTALL PRESSURE GAUGE 38970 V ONTO FUEL PRESSURE TEST FITTING NITIOM OFF FOKAT LEAST 15 SECONDS a SERVE FUEL PRESSURE AS IGNITION 15 TURNED TO THE E AO TURN ON SECONDS THEN OFF DURING THE 2 SECONDS OF ONT TIME THI BETWEEN 190 kPa 27 6 pii 1 9 bar AND 210 kPa 30 psi 2 1 W s ISMI 1 7 1 PAGI Oe AFTER PUMP STOPS RUNMING PRESSURE MAY DECREASE SUGHTLY THEN SHOULD HOLD STEADY WITH NO FURTHER DROP IN PRESSURE if ENGINE I WARM A SLOW GRADUAL INCREASE IN PRESSURE IS WHAT DOES PRESSURED gt e IGNITION OFF FOR AT LEAS co Ge AGAIN TURN THE IGNITION KEY TO ENERGIZE FUELPUMP IMMEDIATELY AFTER PUMP STOPS RUNNING PINCH COMPLETELY SHUT A RUBSER SECTION OF FUEL HOSE BETWEEN FUEL PRESSURE TEST FITTING ANO THROTTLE BODY INJECTION UNIT DOES FUEL PRESSURE STASKIZE AND STOP DROPPING MAKE THE SAME 4 THE THROTTLE BODY INJECTION UNIT AND THE FUEL TANK 4 IF NO PROBLEMS ARE
15. CONNECTION OR OPEN CIRCUIT 10 GREEN WIRE Los OPEN ORCUIT 78 PINK GREEN WIRE VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 203 2 54 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 1 THROTTLE BODY INJECTION UNIT 2 FUEL PUMP 3 FUEL SUPPLY PRESSURE LINE 4 FUEL FILTER 5 FUEL PRESSURE TEST FITTING PART OF TOOL 38970 V 6 FUEL RETURN UNE 7 FUEL PRESSURE GAUGE PART OF TOOL J 28970 V CHART A 7 Page 1 of 2 FUEL SYSTEM DIAGNOSIS 1 7L THROTTLE BODY INJECTION NIVA Circuit Description When the ignition switch is turn d ON the electronic controt module will tum the fuel pump It will remain ON as long as the engine is cranking or running and the electronic control module 15 receiving crankshaft position pulses If there are no reference pulses the electronic control module will shut OFF the fuel pump within 2 seconds after key ON The pump will deliver fuel to the throttle body injection unit where the system Pressure is controlled between 190 kPa 27 6 psi 1 9 bar and 210 kPa 30 5 psi 2 1 bar Excess fuel is then returned to the fuel tank The fuel pump test terminal assembly line data link terminal G is located above and to the right of the driver s kick panel above the electronic control module When the engine is not running and the ignition switch is OFF the pump can be tumed ON Test Description Number s below refer to circled number s
16. EMENT SYSTEMS 1 71 THROTTLE BODY INJECTION FUSE Y GREEN 14 PINK BLACK cott ASSEMBLES DIRECT IGNITION SYSTEM MOOULE ELECTRONIC CONTROL MODULE IGNITION SWITCH VOLTAGE INPUT SIGNAL 39 GREEN WHITE ELECTRONIC SPARK 40 BLACK WHITE 05 BYPASS MODE CONTROL 42 VIOLET WHITE 55 REFERENCE INPUT SIGNAL 58 SLACK RED REFERENCE LOW CRANKSHAFT SENSOR CODE 42 ELECTRONIC SPARK TIMING CONTROL CIRCUIT PROBLEM 1 7L THROTTLE BODY INJECTION NIVA Circuit Description Code 42 will set if the electronic control module detects an improper signal on either the bypass mode control cir cuit 40 Black White wire or the electronic spark timing output circuit 39 Green White wire when the engine is crank ing or while running Review the general description of the ignition system in Section 1 4 Test Description Number s below refer to circled number s on the diagnostic chart 1 Code 42 means the electronic control module has Seen an open or short to ground in the electronic spark timing output or bypass mode control circuits This test confirms Code 42 and that the fault caus ing the code is present Checks for a normal electronic spark timing ground path through the ignition module An electronic spark timing Circuit 39 Green White wire shorted to ground will also read less than 500 ohms however this will be checked later 3 As the test light voltage touches Circuit 40 Black White wire the module should swit
17. ER 39683 OHMMETER SELECTOR Ai GROUND THE BLACK OHMMETER LEAD PROBE ELECTRONIC CONTROL MODULE HARNESS ELECTRONIC SPARK TIMING OUTPUT CIRCUIT 39 GREEN WHITE WIRE USING THE RED OHMMETER LEAD THE OHMMETER SHOULD READ LESS THAN 500 OHMS RECONNECT ELECTRONIC THAT 5 STILL CONNECTED TO Tome GREENAWHITE bene ve AIDS ON FACING PAGE CIRCUIT 40 BLACK WHITE WIRE REPLACE ELECTRONIC CODE 42 INTERMITTENT OR FAULTY CONNECTION GREENIWHITE CONTROL MODULE REFER TO DIAGNOSTIC OR FAULTY IGNITION CONTROL WIRE SHORTED TO GROUND MODULE 6 2 92 AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE UGHT NS 14339 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 131 2 82 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 25 PINK BLACK black 20 EROWN ENGINE GROUND Attaches to engine at ignition module bracket ELECTRONIC CONTROL MODULE OXYGEN SENSOR 06 INPUT SIGNAL pK oveen sensor GROUND 33 EROWN WHITE ELECTRICALLY HEATED EXHAUST GAS OXYGEN SENSOR 10 31 92 5 14335 CODE 44 LEAN EXHAUST INDICATION 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The electronic control module applies a reference voltage of about 450 millivolts between terminals D7 and D6 The oxygen sensor varies the voltage within a range of about 1 volt if the exhaust is rich down through about 10 mil
18. FOUNO REPLACE FUEL PRESSURE REGULATOR ON THE THROTTLE BODY INJECTION UNIT fe CHECK FOR LEAKS OR LOOSE CONNECTIONS BETWEEN THE FUEL TANK AND THE FUEL PRESSURE TEST FITTING THE SUPPLY LINE INCLUDING FUEL FILTER CE FUEL PUMP 4 27 83 IFNOPROBLEMSAREFOUND REPLACE 852793 THROUGH STEP 2 AGAIN MAKING SURE THERE ARE NO LEAKS OR LOOSE CONNECTIONS AS SPECIFIED ABOVE VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 56 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 1 THROTTLE BODY INJECTION UNIT 2 FUELPUMP 3 FUEL SUPPLY PRESSURE LINE 4 FUEL ALTER 5 FUEL PRESSURE TEST ATTING PART OF TOOL J 38970 V 6 FUEL RETURN UNE 7 FUEL PRESSURE GAUGE PART OF TOOL J 28970 V CHART A 7 Page 2 of 2 FUEL SYSTEM DIAGNOSIS 1 7L THROTTLE BODY INJECTION NIVA Test Description Number s below refer to circled number s on the diagnostic chart 4 106 Fuel pressure less than 190 kPa 27 6 psi 1 9 bar falls into two areas Amount of fuel to injector is OK but the pres sure is less than 190 kPa 27 6 psi 1 9 bar Low fuel pressure can cause poor overall perfor marce Restricted flow causing pressure drop Normally vehicle with a fuel pressure of less than 190 kPa 27 6 psi 1 9 bar at idle will not be drive able However if the pressure drop occurs only while driving the engine will surge then stop as pressure begins to drop rapid
19. INJECTION NIVA 147 2 98 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION INTERMITTENTS Page 2 of 2 Definition Problem may or may not turn ON the Check Engine light or store a code INTERMITTENT CHECK ENGINE LIGHT As intermittent Check Engine light and No Diagnostic Codes be caused by Electrical system interference caused by a defective relay electronic control module driven solenoid or switch They can cause a sharp electrical surge Normally the problem wil occur when the faulty component is operated Improper installation of electrical options such as lights 2 way radios etc Electronic spark timing wires not properly routed away from spark plug wires ignition system components and generator Ignition secondary shorted to ground Check Engine light circuit or diagnostic test terminal circuit intermittently shorted to ground Electronic control module grounds not clean tight and in their proper location These ground wires secure to the engine block on the direct ignition system bracket uppermost bolt This bolt was previously used to retain the distributor on a carbureted engine A LOSS OF DIAGNOSTIC CODE MEMORV To check disconnect throttle position sensor and idle engine until Check Engine light comes ON Code 22 should be stored and kept in memory when the ignition is turned OFF longer than 10 seconds If Code 22 is not stored the electronic control module
20. INKTO 0 cue CONNECTION GROUND 25 QR CIRCUIT TECH 1 SHOULD DISPLAY OXYGEN VOLTAGE BELOW PINK SLACK OR 27 20 BROWN 2 VOLT 200 mV WITH ENGINE RUNNING PINK ALACK OR DOES TT OR SHORT CIRCUIT TO FAULTY ENGINE GROUND IN CIRCUIT BLOCK GROUND 25 26 27 28 02 04 r FAULTY OXYGEN SENSOR E R FAULTY CONNECTION FAULTY ELECTRONIC CONTROL 2 OR MODULE CONNECTION bi OPEN CIRCUIT 33 DE 7 WN WHIT CIRCUIT 32 PINK WIRE OR FAULTY ELECTRONIC H CONTROL MODULE AFTER REPAIRS START ENGINES CLEAR CODES CONRRM NO CHECK ENGINE UGHT SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 60 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION COOLANT TEMPERATURE SENSOR 74 GREEN COOLANT TEMPERATURE SENSOR CONNECTOR front face view ur FEE 72 PINK BLACK H H CODE 14 ELECTRONIC CONTROL MODULE COOLANT TEMPERATURE SENSOR INPUT SIGNAL 31 YELLOW SENSOR GROUND 9 15 92 NS 14337 COOLANT TEMPERATURE SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The coolant temperature sensor is a thermistor that ntrols the signal voltage to the electronic control module The electronic control module applies about 5 volts on the Yellow wire from electronic control module terminal C10 to the coolant temperature serisor and looks at the voltage drop When the engine coolant is T
21. IVA CHECK THAT CALIBRATOR I FULLY INSERTED INTO THE ELECTRONIC CONTROL MOOULE EUN REPLACE CALIBRATOR e FULLYANSERT CALIBRATOR e CLEAR CODES AND RECHECK CLEAR CODES AND RECHECK FOR CODE 51 FOR CODE 51 REPLACE ELECTRONIC j mir OOESAND 1 CONTROL MODULE ZAR C gs ji AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT SERVICE MANUAL THROTTLE BODY INJECTION NIVA ENGINE MANAGEMENT SVSTEMS 1 7L THROTTLE BODV INJECTION 2 87 BLANK SERVICE MANUAL THROTTLE 8007 INJECTION NIVA 2 88 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC CONTROL MODULE ERED 9 RED IGNITION RELAY blue connector FUSE GREEN IGNITION SWITCH 16 PINK BLACK VOLTAGE INPUT SIGNAL SYSTEM 12222222 CODE 53 SYSTEM VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA Circuit Description Code 53 will set if the engine is running and the battery voltage is more than 16 9 volts for one second on electron ic control module terminal During the time the fault is present all electronic control module outputs will be dis engaged and setting of additional codes may result Test Description Number s below refer to circled number s on the diagnostic chart l Normal battery output is between 12 15 volts 2 Checks to see if the high voltage reading is due to the generator or incorrect
22. K Fuel pressure use CHART A 7 CHECK For contaminated fuel CHECK Fuel system relay Connect test light between fuel pump test terminal and ground Test light should be ON for 2 seconds following ignition ON after ignition switch has been OFF for at least 10 seconds If not OK use CHART A 5 e CHECK Operation of intake manifold electrical heater see CHART C 9 _ IGNITION SYSTEM e CHECK Ignition system for Proper ignition voltage output with spark tester J 26792 ST 125 Spark plugs wet plugs cracks wear improper gap bumed electrodes or heavy deposits Crankshaft sensor resistance and connections Spark plug leads wires for excessive resistance Bare and shorted wires Loose ignition coil connections Electronic spark timing output circuit for short to ground VAZ SERVICE MANUAL THROTTLE BOOY INJECTION NIVA 2 100 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION HARD START Page 2 of 2 Definition Engine cranks OK but does not star for a long time Does eventually run or may start but immediately dies ADDITIONAL CHECKS CHECK 41 air control operation use CHART C 2C CHECK Forcorrect engine calibrator see Service Bulletins CRANKING AND CHARGING SYSTEMS AND CONDITION OF BATTERY CHECK For low cranking speeds that can cause difficult starting Use the Tech 1 Scan tool i
23. N PLACE WHILE OBSERVING TECH 1 DISPLAY ENGINE IDLING TECH 1 SHOULD NOW DISPLAY OCTANE ADJUSTMENT VOLTAGE LESS THAN 1 VOLT DOES m 3 FAULTY CONNECTIONS OR FAULTY ELECTRONIC CONTROL MODULE AFTER REPAIRS START ENGINE CLEAR CODES AND CONRRM NO CHECK ENGINE LIGHT DISCONNECT HARNESS CONNECTOR FROM OCTANE ADJUST POTENTIOMETER USING CONNECTOR TERMINAL TEST ADAPTER KIT J 35616 CONNECT HARNESS TERMINALS 717 3 TOGETHER TECH 1 SHOULD NOW OISPLAY OCTANE ADJUSTMENT VOLTAGE LESS THAN 1 VOLT CHECK FOR SHORT CIRCUIT TO ALTERNATIVE VOLTAGE SOURCE ON INPUT SIGNAL WIRE CIRCUIT 59 GREEN WIRE BETWEEN ELECTRONIC CONTROL MODULE OCTANE ADJUST POTENTIOMETER HARNESS TERMINAL 1 AND ELECTRONIC CONTROL MODULE TERMINAL 48127 IF NONE FOUND REPLACE OCTANE ADJUST POTENTIOMETER AND RETEST SEE SECTION 3 1 FOR REPLACE AND ADJUST PROCEDURE REPAIR OPEN SENSOR GROUND CIRCUIT BLACK WIRE BETWEEN ELECTRONIC CONTROL MODULE TERMINAL D2 AND OCTANE ADJUST POTENTIOMETER HARNESS CONNECTOR TERMINAL 3 REPAIR OPEN CIRCUIT IN INPUT SIGNAL WIRE CIRCUIT 59 GREEN WIRE BETWEEN TERMINAL 812 AND OCTANE ADJUST POTENTIOMETER HARNESS TERMINAL 717 2 493 NS 15695 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 94 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION CODE 55 ELECTRONIC CONTROL MODULE ERROR FAULTY ELECTRONIC CONTROL MODULE REPLACE ELECTRONIC CONTROL MODULE AFTER REPAIRS START
24. OLANT TEMPERATURE OF 130 C OR HIGHER DISCONNECT COOLANT TEMPERA TECH 3 SHOULD DISPLAY COOLANT T BELOW 30 pots REPLACE COOLANT TEMPERATURE SENSOR CODE 14 COOLANT TEMPERATURE SIGNAL VOLTAGE TOO LOW 1 71 THROTTLE BODY INJECTION 15 INTERMITTENT IF NO ADDITIONAL STORED REFER TO DIAGNOSTIC ORCUTT 31 YELLOW WIRE FROM THE COOLANT TEMPERATURE SENSOR ELECTRONIC CONTROL MODULE TERMINAL C10 15 SHORTED TO GROUND Jm MA TEMPERATURE SENSOR AND THROTTLE POSITION SENSOR TO ELECTRONIC CONTROL MODULE TERMINAL OR FAULTY ELECTRONIC CONTROL MODULE AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 62 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION COOLANT TEMPERATURE ELECTRONIC CONTROL MODULE sl oam TEMPERATURE DD SENSOR INPUT SIGNAL 31 YELLOW 74 GREEN 72 PINK BLACK 2 SENSOR Go GROUND E COOLANT TEMPERATURE THROTTLE POSMON SENSOR CONNECTOR front face view CODE 15 COOLANT TEMPERATURE SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The coolant temperature sensor is a thermistor that controls the signal voltage to the electronic control The electronic control module applies about 5 volts on Circuit 31 Yellow wire from the electro control module C10 to the coolant temperature looks at the vo
25. ON ON ENGINE NOT RUNNING CH 1 SCAN TOOL UST Cie DISCONNECT THROTTLE POSITION SENSOR TECH 1 SHOULD DISPLAY THROTTLE POSITION BELOW 2 VOLT 200 mv IS LIGHT ONT CODE 21 THROTTLE POSITION SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA CODE 21 i5 INTERMITTENT E NO ADDITIONAL COOES WERE STORED REFER TO DIAGNOSTIC AIDS ON FACING PAGE e ECH ELECTRONIC CONTR SHORTED TO VOLTAGE OR FAULTY ELECTRONIC CONTROL MOD AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 66 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION THROTTLE POSITION SENSOR WIDE OPEN THROTTLE POSITION SENSOR CONNECTOR front face view ELECTRONIC CONTROL MODULE THROTTLE SENSOR 75 1 GROUND COOLANT TEMPERATURE SENSOR 9 15 92 NS 14341 CODE 22 THROTTLE POSITION SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The throttle position sensor provides a voltage signal that changes relative to the throttle blade Throttle position sensor signal voltage varies from about 0 25 to 1 25 volts at idle to about 5 volts at wide open throttle The throttle position sensor signal is of the inpitts used by the electronic control module for fuel control and for most of the electronic control module controlled outputs Test Description Number s below refer to
26. OUND INTAKE AIR 1 MANIFOLD ABSOLUTE PRESSURE SENSOR roo L octane osse rorum j iB CODE 25 INTAKE AIR TEMPERATURE SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The intake air temperature sensor uses a thermistor to control the signal voltage to the electronic control module The electronic contro module applies a voltage about 5 volts on Circuit 65 White to the sensor When intake air is cold the sensor thermistor resistance is high Therefore the electronic control module will see a high signal voltage As the air warms the sensor resistance becomes less and the voltage drops Test Description Number s below refer to circled number s on the diagnostic chart A Code 25 will set if l Intake air temperature greater than 140 C is detect ed for approximately 1 second with the engine running Diagnostic Aids If the engine has been allowed to cool to an ambient temperature overnight the coolant temperature and intake air temperature may be checked with a Tech 1 Scan tool ahd should read close to each other A Code 25 will result if Circuit 65 White is shorted to ground If Code 25 is intermittent refer to Symptoms Section 2 9 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA m3 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 73 s 25 E INTAKE AIR TEMPERATURE SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY INJEC
27. R FAULTY ELECTRONIC CONTROL MODULE 5 25 92 AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT NS 14369 SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 78 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION Circuit Description l M IDLE AIR CONTROL VALVE CONNECTOR AIR FLOW NS N 5 ELECTRONIC CONTROL MODULE 47 BLUE WHITE 48 BLUE BLACK 49 GREEN WHITE 50 GREEN BLACK cs coit TAT HIGH Tee cott a Low COIL B HIGH 8 CODE 35 IDLE SPEED ERROR 1 7L THROTTLE BODY INJECTION NIVA Code 35 will set if the closed throtle engine speed is 150 revolutions per minute above the desired commanded idle speed for more than 3 seconds Review the general description of the idle air control operation in Fuel Metering System Section 1 2 Test Description Number s below refer to circled number s on the diagnostic chart The Tech 1 Scan tool revolutions per minute con trol mode is used to extend and retract the Idle air control valve The valve should move smoothly within the specified range If the idle speed is com manded idle air control extended too low below 700 revolutions per minute the engine may stall This may be normal and would not indicate a prob lem Retracting the idle air control beyond its con trolled range above 1500 revolutions per minute will cause a delay before the revolutions per minute start dro
28. STIC AIDS ON FACING PAGE IGNITION ON ENGINE NO DOES TECH 1 DISPLAY A MANIFOLD ABSOLUTE PRESSURE VOLTAGE OF 1 VOLT OR LESS n F MANIFOLD ABSOLUTE PRESSURE SENSOR INPUT SIGNAL ORCUTT CIRCUIT 43 GREEN WIRE FROM MANIFOLD ABSOLUTE PRESSURE SENSOR TERMINAL 787 TO MANIFOLD ABSOLUTE PRESSURE SENSOR GROUND CIRCUIT CIRCUIT 69 70 BLACK WIRE FROM MANIFOLD ABSOLUTE PRESSURE SENSOR TERMINAL TO D ELECTRONIC CONTROL MODULE TERMINAL 7027 AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 125 2 76 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION CONTROL MODULE MANIFOLD ABSOLUTE PRESSURE Hose connects to Ti ed throttle body mae 5 VOLTS REFERENCE 66 GRAY 75 GRAY MANIFOLD ABSOLUTE 43 GREEN PRESSURE SENSOR INPUT SIGNAL 69 BLACK SENSOR t INTAKE AIR TEMPERATURE SENSOR 1 GROUND mese artistiche CODE 34 MANIFOLD ABSOLUTE PRESSURE SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The manifold absolute pressure sensor responds to changes in intake manifold pressure The electronic control module receives this information as a signal voltage that will vary from about 1 1 5 volts at idle to 4 4 5 volis at wide open throttle The Tech 1 Scan tool displays manifold pressure in voltage and kilopascals pressure Low pressure reads a low voltag
29. SYSTEM RELAY 1 FUEL SYSTEM RELAY ORCUIT ELECTRICAL CHECK 4 e IGNITION ON ENGINE NOT RUNNING 1 OK SEE CHART A 7 FOR FUEL SYSTEM PRESSURE PROSE RELAY HARNESS CONNECTOR TERMINAL 787 WITH H A TEST LIGHT J 34142 6 CONNECTED TO GROUND V Lea TOFUSE CONNECT ATEST LIGHT BETWEEN HARNESS CONNECTOR FAULTY CONNEL TERMINALS E AND 787 PINKIBLACK WII l 727216 FUSE Z IN FUEL PUMP CIRCUIT 1 CONNECT TEST LIGHT BETWEEN TERMINAL 727 AND GROUND e ENERGIZE THE FUEL SYSTEM RELAY AS DESCRIBED ABOVE FAULTY CONNECTION OR REPAIR OPEN GROUNO CIRCUIT 18 BROWN WIRE BETWEEN FUEL PUMP AND ENGINE BLOCK GROUND RELAY TERMINAL 67 FAULTY CONNECTION OR CHECK FOR OPEN OR SHORT GROUND IN CIRCUIT 63 GREEN WHITE WIRE FROM RELAY TERMINAL 727 TO ELECTRONIC CONTROL MODULE TERMINAL A17 OKAT S A FAULTY ELECTRONIC CONTROL MODULE IGNITION ON Ze le RECONNECT FUEL SYSTEM RELAY Le SACKPROBE RELAY TO CONNECT TEST LIGHT BETWEEN TERMINAL 4 AND GROUND Je ENERGIZE THE FUEL SYSTEM RELAY AS DESCRIBED IN STEP 0 ABOVE TEST LIGHT SHOULD BE ON FOR 2 SECONDS Rer e TEST LIGHT SHOULD BE ON FOR 2 SECONOS LIGHT ON FAULTY CONNECTION Jo OPEN CIRCUIT GRAY WIRE ns OR sec Ei FAULTY FUEL PUMP S FAULTY FUEL PUMP GROUND FAULTY
30. TER XIT JUMPER TERMI REPAIR OPEN CIRCOIT IN 2d 4 D F RED WIRE AND TERMINAL 8 PINK WIRE TOGETHER USING A FUSED BROWN WIRE 17 TO RELAY d JUMPER WIRE xe CONNECTOR TERMINAL 727 e CONNECT TECH 1 SCAN TOOL SELECT FO DATA UST e TECH 1 SCAN TOOL SHOULD DISPLAY SYSTEM VOLTAGE NEAR m BATTERY VOLTAGE E d YES n x PN 5 FAULTY CONNECTION OR FAULTY RELAY F WITH RELAY HARNESS CONNECTOR TERMINALS 74 AND 8 STILL FAULTY FUSE Y OR SHORT 1 JUMPERED REMOVE FUSE CONNECT TEST LIGHT FROM GROUND TO TO GROUND ON CIRCUIT PINK WIRE TERMINAL OF FUSE Y HARNESS CONNECTOR TEST LIGHT 14 15 16 86 PINK BLACK Een WIRE DOES 7 YES G FAULTY CONNECTION OR OPEN CIRCUIT 334 15 16 86 PINK BI CKCWIRE OR FAULTY ELECTRONIC INTROL MODULE m Si VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 101 2 52 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION m ELECTRONIC LINK CONNECTOR Fuse Z RED CONTROL MODULE front face view VOLTAGE TEST TERMINAL GREENE FUEL SYSTEM RELAY CONTROL FUEL SYSTEM RELAY red connector Attaches to engine at ignition module bracket INJECTOR CONTROL IN TANK ELECTRIC 22 SH 2 INJECTOR ORE x FUEL LEVEL SENDER CURRENT LIMITER 42093 NS 14411 5 FUEL SYSTEM ELECTRICAL CIRCUIT CHECK 1 7L THROTTLE BODY INJECTION NIVA Circuit Description When the ignition sw
31. THAN 1 VOLT OR MORE THAN 4 7 VOLTS CODE 5415 INTERMITTENT if NO ADDITIONAL CODES WERE STORED REFER TO DIAGNOSTIC AIDS ON FACING PAGE LESS THAN 1 VOLT MORE THAN 4 7 VOLTS DISCONNECT HARNESS CONNECTOR FROM REFER TO COOE 54 POTENTIOMETER PAGE 2 2 TECH 1 OCTANE ADJUSTMENT VOLTAGE SHOULD NOW READ MORE THAN 4 7 VOLTS DOES IT OCTANE ADIUSTMENT INPUT SIGNAL CIRCUIT POTENTIOMETER CIRCUIT 59 GREEN WIRE FROM ELECTRONIC CONTROL MODULE TERMINAL 78127 TO ADJUSTMENT TERMINAL 717 SHORTED GROUND OR FAULTY ELECTRONIC CONTROL MODULE 2 5 93 AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE UGHT NS 14373 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 141 2 92 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION ELECTRONIC CONTROL MODULE 53 GREEN 5 VOLTS OCTANE ADJUSTMENT rp H Yo 1 POTENTIOMETER 1 MANIFOLD AESOLUTE INPUT SIGNAL PRESSURE SENSOR 1 t 1 FID sen 7 GROUND HON m 1 INTAKE AR 1 TEMPERATURE SENSOR OCTANE ADJUSTMENT POTENTIOMETER front face view CODE 54 Page 2 of 2 OCTANE ADJUSTMENT SIGNAL VOLTAGE TOO HIGH OR TOO LOW 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The octane adjustment potentiometer provides a voltage that changes with an adjustment screw The voltage is adjustable from about 1 volt to about 4 7 volts The engine must be running to allow the Tech 1 to read this voltage correctly Th
32. TION NIVA E DOES TECH 1 SCAN TOOL DISPLAY INTAKE TEMPERATURE OF 130 C OR HOTTER H DISCONNECT INTAKE AR TEMPERATURE SE TECH 1 SCAN TOOL SHO AY TEMPI BELOW 30 C DOES M 65 WHITE WIRE SHORTED TO GROUND F ot TO SENSOR GROUND CIRCUIT 69 71 BLACK WIRE OR FAULTY ELECTRONIC CONTROL MODULE TEMPERATURE 5 RESISTANCE VALUES APPROXIMATE A A 5 26 92 AFTER REPAIRS START ENGINE CLEAR CODES AND CONHRM NO CHECK ENGINE NS 14365 SERVICE MANUAL THROTTLE SODY INJECTION NIVA 2 74 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION MANIFOLD ABSOLUTE MANIFOLO ABSOLUTE PRESSURE SENSOR PRESSURE Hose connects to D throttle body 70 BLACK PILAM TO 1 INTAKE AIR TEMPERATURE SENSOR ed POSITION SENSOR 66 GRAY d 75 GRAY ELECTRONIC CONTROL MODULE H 4 5 VOLTS REFERENCE MANIFOLD ABSOLUTE PRESSURE SENSOR INPUT SIGNAL 43 GREEN 69 BLACK 1 SENSOR GROUND CODE 33 MANIFOLD ABSOLUTE PRESSURE SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The manifold absolute pressure sensor responds to changes in intake manifold pressure The electronic control module receives this information as a signal voltage that will vary from about 1 1 5 volts at idle to 4 4 5 volts at wide open throttle The Tech 1 Scan tool displays manifold pressure in volts and kilopascals pressu
33. TO ELECTRONIC TROL EE CR VERAL TIMES Ze 9 USING DIGITAL VOLT OHM AMP s WITH TEST LIGHT J 34142 8 CONNECTED GROUND i MULTIMETER CHECK VOLTAGE ON VEHICLE PROBE POWER SOURCE TO VEHICLE SPEED SENSOR CIRCUIT SPEED SENSOR INPUT SIGNAL ORCUIT 29 25 PINK BLACK WIRE FROM FUSE R TO VEHICLE SPEED CIRCUIT 30 GREEN WIRE TO ELECTRONIC d SENSOR CONNECTOR TERMINAL AN CHECK FUSE R divors REPAIR OPEN IN PU SPEED SENSOR GROUND VEHICLE SPEED f Zossen Jaret SIGNAL cc wat ORCUIT CIRCUIT 37 BROWN WIRE SENSOR POWER i TO ELECTRONIC FROM VEHICLE SPEEO SENSOR SOURCE CIRCUIT CONTROL MODULE CONNECTOR TERMINAL 3 TO 2925 TERMINAL 7A107 OPEN HARNESS GROUND PINK BLACK r 1S TEST LIGHT ON E SHORTED TO GROUND OR FAULTY ELECTRONIC CONTROL MODULE wo f FAULTY VEHICLE SPEED REPAIR OPEN VEHICLE SPEED l SENSOR CONNECTION SENSOR GROUND 37 BROWN WIRE FAULTY VEHICLE SPEED FROM VEHICLE SPEED SENSOR b SENSOR CONNECTOR TERMINAL 737 E 5 26 92 AFTER REPAIRS START ENGINE CLEAR CODES AND TO HARNESS GROUND Ns 14363 CONFIRM NO CHECK ENGINE LIGHT VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA m 2 121 2 72 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION INTAKE AIR TEMPERATURE SENSOR ELECTRONIC CONTROL MODULE INTAKE AIR TEMPERATURE SENSOR SIGNAL 65 WHITE 5 VOLT REFERENCE SENSOR H TO H GR
34. 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 CA11 OSZ 4510 United Kingdom Australia T 44 0 17 6877 9794 T 61 7 5495 5100 F 44 0 17 6877 9197 F 61 7 5495 5152 E alan lada co uk E andy ladaparts com W http www lada co uk W http www ladaparts com ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 51 CHART A 4 Page 2 of 2 IGNITION RELAY AND POWER CIRCUITS CHECK 1 7L THROTTLE BODY INJECTION NIVA FROM PAGE 1 2 H CONNECT TEST LIGHT SETWEEN TERMINALS 2 ANO 6 OF IGNITION RELAY BLUE HARNESS CONNECTOR LIGHT ON SING CONNECTOR TERMINAL TEST ADAP
35. URE SENSOR ADOMIONAL CODES WERE JUMPER HARNESS TERMINALS A STORED REFER TO DIAGNOSTIC BETOGETHER iy FADS ON FACING PAGE TECH 1 SCAN TOOL SHOULD 7 TEMPERATURE OVER 130 C DOES IT Es ait TO JUMPER CIRCUIT 65 WHITE WIRE TO GROUND TECH 1 SCAN TOOL SHOULD DISPLAY TEMPERATURE OVER OPEN CIRCUIT 65 WHITE WIRE DK FAULTY CONNECTION OR FAULTY 69 71 BLACK WIRE OR ELECTRONIC CONTROL MODULE FAULTY CONNECTION ORfAULTY ELECTRONIC CONTROL MODULE 5670 7280 9420 12300 16180 21450 28680 2700 100700 5 26 92 AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT NS 14343 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 70 ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 25 PINK BLACK FUSE R BLACK ELECTRONIC PINK BLACK CONTROL MODULE 4 12 VOLT VEHICLE NSO INPUT SIGNAL VEHICLE SPEED D SENSOR VEHICLE SPEED 3 SENSOR CONNECTOR front face view CODE 24 NO VEHICLE SPEED SIGNAL 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The electronic control module terminal 10 applies and monitors 12 volts on vehicle speed sensor input signal Circuit 30 Green wire The vehicle speed sensor alternately grounds vehicle speed sensor input signal circuit when the drive wheels are turning This pulsing action takes place about 1242 times per kilometer and the electronic control module calculates vehicle speed based on the time between
36. UTT 35 75 Gi CUIR CIRCUIT 72 23 GRAY WIRE FROM ELECTRONIC CONTROL POSTS MODULE TERMINAL 14 TO THROTTLE POSITION SENSOR TERMINAL A IS OPEN OR SHORTED TO GROUND FAULTY ELECTRONIC CONTROL MODULE OR o MODULE FAULTY CONNECTION OR FAULTY ELECTRONIC CONTROL MODUM OR FAULTY ELECTRONIC CONTROL MODULE 6 2 92 AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT NS 14361 VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 68 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION INTAKE AIR TEMPERATURE SENSOR ELECTRONIC CONTROL MODULE INTAKE AIR TEMPERATURE SENSOR SIGNAL 65 WHITE 5 VOLT 71 BLACK 69 BLACK REFERENCE SENSOR f d GROUND INTAKE AIR Li MANIFOLD PRESSURE SENSOR H TEM ten L ADJUSTMENT POTENTIOMETER i 9 15 92 NS 18364 INTAKE AIR TEMPERATURE SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The intake air temperature sensor uscs a thermistor to control the signal voltage to the electronic control module The electronic control module applies a voltage about 5 volis on Circuit 65 White wire to the sensor When the intake air is cold the scnsor thermistor resistance is high therefore the electronic control module will see a high sig nal voltage As the air wams the sensor resistance becomes low therefore the electronic control module will see a low voltage
37. bsolute pressure sensor signal voltage a known good vehicle is a good way to check accuracy is 100 low less than 14 kPa of pressure for less suspect sensor the reading should be the same shan one second 02 volt Also CHART C 1D can be used to test the 2 If the electronic control module recognizes the high manifold absolute pressure sensor manifold absolute pressure signal the electronic control module and wiring are OK Refer to Intermittents in Symptoms Section 2 9B VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA i st 3 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 77 F CODE 34 gt MANIFOLD ABSOLUTE PRESSURE 3 SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY INJECTION NIVA s CONNECT TECH 1 SCAN TOOL SELECT FO DATA UST e ENGINE IDLING DOES TECH 1 SCAN TOOL DISPLAY A MANIFOLD ABSOLUTE PRESSURE VOLTAGE BELOW 0 25 VOLT e IGNITION OFF e DISCONNECT MANIFOLD ABSOLUTE PRESSURE SENSOR ELECTRICAL CONNECTOR e USING CONNECTOR TERMINAL TEST ADAPTER KIT 35616 TO JUMPER CONNECTOR TERMINALS 787 TO a IGNITION OK DOES MANIFOLD ABSOLUTE PRESSURE VOLTAGE READ OVER 4 7 VOLTS JOVEJJMPE 2 WITH A TEST LIGHT 34142 8 CONNECTED TO BATTERY VOLTAGE PROBE TERMINAL B GREEN WIRE MANIFOLD ABSOLUTE PRESSURE SENSOR INPUT SIGNAL CIRCUIT IGNITION ON ENGINE NOT RUNNING DOES TECH 1 SCAN TOOL READ OVER 4 VOLTS SHORTED TO GROUND O
38. ch caus ing the ohmmeter to switch ranges if the meter is in the low ohms position The important thing is that the module switched above 500 ohms 4 The ignition module did not switch and this step checks for e Electronic spark timing output Circuit 39 Green White wire shorted to ground Bypass mode control Circuit 40 Black White wire open gt e Faulty ignition module connection module 5 Confirms that Code 42 is a faulty electronic control module and not an intermittent in Circuits 39 Green White wire or Circuit 40 Black White wire Diagnostic Aids An open or ground in the electronic spark timing circuit will result in the engine continuing to but in bypass ignition timing mode ignition module tim ing at a calculated timing value and the Check Engine light will not be ON If the electronic spark timing fault is still present the next time the engine is restarted a Code 42 will be set and the engine will oper ate in module timing If Code 42 is intermittent refer io Section 2 9B VAZ SERVICE MANUAL THROTTLE BODY INJECTION 130 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 81 CODE 42 ELECTRONIC SPARK TIMING DO ara coves CONTROL CIRCUIT PROBLEM RNC CE ERT MINUTE 1 7L THROTTLE BODY DOES CODE 42 SET INJECTION NIVA f REFER TO 3 DIAGNOSTIC 1057 FACING PAGE AGNITION ON EM USING DIGITAL VOLT MULTIMET
39. circled number s on the diagnostic chart 1 Code 22 will set if Engine has been running Throttle position sensor signal voltage is less than 0 16 volt The throttle position sensor has an auto zeroing fea ture If the voltage reading is within the range of about 0 25 10 1 25 volts the electronic control mod ule will use that value as closed throule If the volt age reading is out of the auto zero range at closed throtde check for a binding throttle cable or dam aged linkage if OK continue with diagnosis 2 This step simulates Code 21 high voltage If the electronic contro module recognizes the high signal voltage then the electronic control module and wiring are OK 3 This simulates a high signal voltage to check for an open in throttle position sensor signal input circuit Circuit 36 Blue wire from throttle position sensor terminal C to electronic conuol modulc terminal CI3 The Tech 1 Scan tool will not read up lo 12 volts but what is important is that thc electronic control module recognizes the signal on throttle position sensor signal input circuit Diagnostic Aids A Tech 1 Scan tool reads throttle position in volts With ignition or at idle throttle position sensor signal voltage should read between 0 25 to 1 25 volts with the throttle closed and increase at a steady rate as throwe is moved toward wide open throtile An open or short to ground in 5 volt reference cir Cuil C
40. e octane adjustment voltage acts as an ignition timing spark retard ratio trim pot which allows for adjustments when low octane fuel produces spark knock Test Description Number s below refer to circled number s on the diagnostic chart 3 This step checks for a short to voltage or a potential ly bad octane adjust potentiometer 4 This step checks for an open ground circuit between the electronic control module and octane adjust potentiometer terminal 3 5 This will determine if there is an open in the input signal wire faulty connections or a potentially bad electronic control module SERVICE MANUAL THROTTLE BODY INJECTION NIVA E D ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 93 CODE 54 Page 2 of 2 OCTANE ADJUSTMENT SIGNAL VOLTAGE TOO HIGH QR TOO LOW 1 7L THROTTLE BODY INJECTION NIVA 2 CONTINUED FROM i CODE 54 PAGE 1 TECH 1 DISPLAYS OCTANE ADJUSTMENT VOLTAGE ABOVE 4 7 VOLTS ENGINE IDLING DOES IT REMOVE JUMPER WIRE FROM BETWEEN OCTANE ADJUST POTENTIOMETER HARNESS TERMINALS 717 AND 3 USING CONNECTOR TEST ADAPTER KIT 35616 CONNECT OCTANE ADJUST POTENTIOMETER HARNESS TERMINAL 1 TO GROUND CIRCUIT 59 GREEN WARE ENGINE IDUNG TECH 1 SHOULD NOW DISPLAY OCTANE ADJUSTMENT VOLTAGE LESS THAN 1 VOLT AT ELECTRONIC CONTROL MODULE BACKPROSE CONNECTOR 78127 WITH A TEST LIGHT CONNECTED TO GROUND LEAVE TEST LIGHT I
41. e while a high pressure reads a high voltage If the manifold absolute pressure sensor fails the electronic control module will substitute a fixed manifold absolute pressure value and use the throttle position sensor to control fuel delivery Test Description Number s below refer to circled 3 The Tech 1 Scan tool may not display 12 volts number s on the diagnostic chart The important thing is that the electronic control i module recognizes the voltage as more than 4 volts 1 Code 34 will set if indicating that the electronic control module and e Malfunction Code 21 is not set manifold absolute pressure sensor input signal cir Engine speed is less than 1200 revolutions per cuit are OK minute Diagnostic Aids Manifold absolute pressure sensor signal voltage An intermittent open in manifold absolute pressure is too low less than 14 kPa of pressure for less sensor input signal circuit or 5 volt reference circuit than one second will result in a Code 34 OR With the ignition ON and the engine not running Malfunction Code 21 is not set the manifold pressure is equal to atmospheric pressure Engine speed is greater than 1200 revolutions and the signal voltage will be high This information is per minute used by the electronic control module as an indication of 99 vehicle altitude and is referred to as barometric pressure Mos 6 position greater 20 Comparison of this barometric reading with a sensor in Manifold a
42. ec tronic control module terminal D2 will result in a Code 33 and or Code 23 and Code 54 With the ignition and the engine not running the manifold pressure is equal to atmospheric pressure and the signal voltage may be high This information is used by the electronic control module as an indication of vehicle altitude and is referred to as barometric pressure Comparison of this barometric reading with a sensor in a known good vehicle is a good way to check accuracy of a suspect sensor the reading should be the same 0 2 volt Also CHART C 1D can be used to test the manifold absolute pressure sensor Refer to Intermittents in Symptoms Section 2 9B If vacuum hose is disconnected or leaking idle air control counts will be close to zero 0 and engine may idle with high engine speed VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA p ENGINE MANAGEMENT SYSTEMS 1 7L THROTILE BODY INJECTION 2 75 jet CODE 33 D MANIFOLD ABSOLUTE PRESSURE SIGNAL VOLTAGE TOO HIGH 1 7L THROTTLE BODY INJECTION m Ge CONNECT TECH 1 SCAN TOOL SELECT DATA LIST ENGINE IDLING IF ENGINE IDLE IS ROUGH UNSTABLE OR INCORRECT CORRECT CONDITION BEFORE USING THIS CHART SEE SYMPTOMS IN SECTION B DOES TECH 1 SCAN TOOL DISPLAY A MANIFOLD ABSOLUTE PRESSURE VOLTAGE OF 4 0 VOLTS OR MORE F 33 IS INTERMITTENT X NO ADDITIONAL CODES WERE STORED EFER TO DIAGNO
43. ent use of diagnostic code charts may result in replacement of good parts FAULTY ELECTRICAL CONNECTIONS OR WIRING e Most intermittent problems are caused by faulty electrical connections or wiring Perform a careful check of suspect circuits for Poor mating of the connector halves or terminals not fully seated in the connector body backed e Improperly formed terminals connector terminals in problem circuit should be carefully reformed or teplaced to insure proper contact tension Poor terminal to wire connection This requires removing terminal from the connector body to check See Service Operations Section 3 Wiring Harness Service ROAD TEST e Ifa visual physical check does not find the cause of the problem the vehicle can be driven with voltmeter connected to a suspected circuit or a Tech 1 Scan tool may be used An abnormal volt age or Tech 1 Scan tool reading when the problem occurs indicates the problem may be in that circuit The Tech 1 Scan tool has a special mode called snapshot This snapshot mode can be used to capture electronic control module serial data when a problem occurs so that the technician can play back the data one event at a time to look for erroneous data when the fault occurred For more infor mation on the snapshot mode refer to the Tech 1 operator s manual VAZ SERVICE MANUAL THROTTLE BODY
44. ference voltage of approximately 450 millivolts between terminals Dp and D6 The oxygen sensor varies the voltage within a range of about 1 volt if the exhaust is rich and down through about 10 millivolt if exhaust is lean A rich exhaust condition will cause the oxygen sensor to output a high voltage got The sensor is like an open cite cold sensor causes Open Loop operat B Test Description Number s b i w refer to circled number s on the diagnostic chart 1 Code 45 is set if The fuel system is operating in Closed Loop The oxygen sensor signal voltage on Circuit 32 Pink wire remains above 600 millivolts for 90 seconds a Diagnostic Aids ji Using the Tech 1 Scan tool observe the memory fuct adjustment values at different revolutions per minute ard air flow conditions The Tech 1 Scan tool also displays the memory fuel adjustment cells so the memory fuel adjustment values can be checked in each of the cells to determine when the Code 45 may have been set If the conditions for Code 45 exist the memo ry fuel adjustment values will be close to 28 Sensor that could Cause a rich Code 15 see Code 15 for sensor resistance values Throttle Position Sensor An intermittent throttle position sensor output will cause the system to go rich due to a false indication of the acceler ating Refer to CHART C 1H Fuel Pressure System will govrich if
45. ircuit 35 75 Gray wire from throttle position sen sor terminal A to electronic control module terminal C14 or throttle position sensor signal input circuit Circuit 36 Blue wire from throttle position sensor ter minal C to electronic control module terminal C13 will result in a Code 22 Refer to Intermittents in Symptoms Section 2 9B VAZ SERVICE MANUAL THROTTLE 8OOY INJECTION E b vemm Cx ENGINE MANAGEMENT SYSTEMS 1 7L THROTILE BODY INJECTION 2 67 CODE 22 THROTTLE POSITION _ SIGNAL VOLTAGE TOO LOW 1 7L THROTTLE BODY INJECTION NIVA AGNITION ON ENGINE NOT RUNNING TECH V SCAN TOOL OATAUST T DOSER ay 1 ES TECH Y UISPLAY THROTTLE POSITION RAN CH e DISCONNECT THROTTLE POSITION SENSOR CONNECTOR USING CONNECTOR TERMINAL TEST ADAPTER KIT 35616 TO JUMPER THROTTLE POSITION SENSOR CONNECTOR TERMINALS A AND CIRCUIT 35 75 GRAY WIRE FROM THROTTLE POSITION SENSOR TERMINAL TO ELECTRONIC NTROL MODULE TERMINAL 147 CIRCUIT 6 WIRE FROM THROTTLE POSITION SENSOR TERMINAL 767 70 of FAULTY THROTTLE POSITION SENSOR CONNECTION gt j FAULTY THROTTLE POSITION SENSOR WITH A TEST LIGHT J 34142 8 CONNECTED BATTERY VOLTAGE USE CONNECTOR TERMINAL TEST ADAPTER KIT 135636 TO PROSE THROTTLE POSITION SENSOR TERMINAL OSITION SENSOR INPUT SIGNAL CIRCUIT 36 BLUE TECH 1 SHOULD BEN FERENCE CIRCUIT ORC
46. is thermistor resistance is high therefore the electronic control module will se high signal vol ge As the engine warms the coolant sensor thermistor resistance becomes less and the electronic control module sees a lower signal voltage At normal engine operating temperature 85 C 95 C th voltage will measure about 1 5 to 2 0 volis Test Description Number s below refer to circled number s on the diagnostic chart 1 Code 14 will set if Engine has been running longer than 2 seconds Coolant temperature sensor input signal voltage indicates engine coolant temperature is above 135 C 2 This test determines if the Circuit 31 Yellow wire from the coolant temperature sensor to electronic control module terminal C10 is shorted to ground low volts resistance which will set a Code 14 Diagnostic Aids The Tech 1 Scan tool displays engine temperature in degrees Celsius After the engine is started the tem perature should rise steadily to about 85 95 C then sta bilize when the thermostat opens Check tenni at the sensor for a good connection Refer to Intermittents in Symptoms Section 2 9B VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 110 k S ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 61 IGNITION ON ENGINE HOT RUNNING CONNECTTECH 1 e SELECT DATA UST DOES TECH 1 DISPLAY CO
47. is faulty VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 771 ay ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 99 HARD START Page 1 of 2 Definition Engine cranks OK but does not start for a long time Does eventually run or may start but immediately dies PRELIMINARY CHECKS Perform the careful visual physical checks as described at start of Symptoms in this section e sure the driver is using the correct starting procedure This includes depressing and holding the clutch pedal down while cranking to start When starting the engine at very cold temperatures of below 10 C the accelerator pedal should be held down 1 4 of the way while cranking to start as well as depressing the clutch pedal SENSORS e CHECK Coolant temperature sensor Using a Tech 1 Scan tool compare coolant temperature with ambient temperature on a cold engine If coolant temperature reading is 2 C greater than or less than ambient air temperature on a cold engine check for high resistance in coolant sensor circuit or sensor itself Compare resistance value to the Diagnostic Aids chart on the Code 14 or Code 15 chart 1 e CHECK Throttle position sensor use CHART CHECK Manifold absolute pressure sensor use CHART C 1D FUEL SYSTEM CHECK In line fuel filter Replace if dirty or plugged CHECK For poor quality fuel CHEC
48. itch is tumed ON the electronic control module will activate the fuel pump relay and run ithe in tank fuel pump The pump will operate as long as the engine is cranking or running and the electronic control module is receiving ignition reference pulses Tf there are reference pulses the electroni control module will shut OFF the fuel pump within 2 seconds after ignition ON Test Description Number s below refer to circled number s on the diagnostic chart 1 The fuel system relay as described above can energized by tuming the ignition key to the ON position after it has been OFF for at least 15 sec onds The fuel pump should run for 2 secorids and then turn OFF as described above To reenergize the pump tum the key to the OFF position for 10 seconds then tum it to the ON position again VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 192 574 p m m ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 53 CHART A 5 FUEL SYSTEM ELECTRICAL CIRCUIT CHECK 1 7L THROTTLE BODY INJECTION NIVA IGNITION MUST SE OFF FOR ATLEAST 15 SECONDS a ENABLE FUEL SYSTEM BY TURNING IGNITION KEY TO ON POSITION B LISTEN FOR RUNNING FUEL PUMP AT REAR OF VEHICLE e FUEL PUMP SHOULD RUN FOR 2 SECONDS AFTER IGNITION DOES IT be pal ae DISCONNECT FUEL
49. livolt if exhaust is lean A lean exhaust condition will cause the oxygen sensor to output low voltage The sensor is like open circuit and produces no voltage when it is below about 315 C An open sensor circuit cold sensor causes Open Loop operation Test Description Number s below refer to circled number s on the diagnostic chart 1 Code 44 is set if The fuel system is operating in Closed Loop e The oxygen sensor signal voltage on Circuit 32 Pink wire remains below 300 millivolts for 50 seconds Diagnostic Aids Using the Tech 1 observe the memory fuel adjust ment values at different revolutions per minute and air flow conditions The Tech 1 also displays the memory fuel adjustment cells so the memory fuel adjustment values can be checked in each of the cells to determine when the Code 44 may have been set If the conditions for Code 44 exist the memory fuel adjustment values will be close to 50 Check for intermittent connection between tor and oxygen sensor Poor connection at oxygen sensor ground wire Fuel Contamination Water even in small amounts near the in tank fuel puri inlet can be deliyered to the injector The water causes a lean exhaust and an set a Code A4 Fuel Pressure System will be lean if pressure is too low It may be necessary to monitor fuel pres sure while driving the vehicle at various road speeds and or load
50. ltage drop When sensor thermistor resistanice is high th electronic control module will see high gnal voltage As the engine warms th coolant sensor hemii resistance becomes less and the electronic control modile sees a lower signal voltage At n rmal engine operating temperature 85 C 95 C the voltage will measure about 1 5 to 2 0 volts Test Description Number s below refer to circled trol module terminal C10 If the Tech 1 displays number s on the diagnostic chart a high temperature when the Yellow wire is shorted to ground then the Circuit 31 Yellow wire to elec 1 Code 15 will sevif tonic control module terminal C10 and the elec Engine has been running longer than 58 setotids tronic control module are AND Voltage between the Circuit 31 Yellow wire coolant e Coolant temperature sensor signal voltage indi temperature sensor to electronic control module St cates engine coolant temperature less than rhirial C10 ground is normally 5 volts the 37 coolant temperature sensor connector disconnected 2 This test simulates a Code 14 coolant temperature 3nd not jumpered shorted to ground sensor high temperature low voltage resistance Diagnostic Aids indicated If the electronic control module receives The Tech 1 Scan tool reads engine coolant tem the low voltage resistance signal high temperature perature in degrees Celsius After the engine is started and the Tech
51. ly 5 Tuming the fuel pump and restricting fuel flow at the fuel pressure gage will determine if the fuel pump can supply enough fuel pressure to the injector to operat properly above 190 kPa 27 6 psi 19 bar Do not restrict the fuel return line this may damage the fuel pressure regulator This test determines if the high fuel pressure is due to a restricted fuel return line or a throttle body pressure regulator problem Apply battery voltage to the fuel pump test connector only long enough to get an accurate fuel pressure reading SERVICE MANUAL THROTTLE BODY INJECTION NIVA E 2 UU 1 H FROM CHART A 7 1022 DISCONNECT TECH 1 SCAN TOOL USING A FUSED JUMPER WIRE APPLY BATTERY VOLTAGE FUEL PUMP TEST TERMINAL G ON THE ASSEMBLY LINE DATA UNK OBSERVE FUEL PRESSURE GAUGE PRESSURE IS LESS THAN 190 kPa 27 6 psi 1 9 bar LiSTE FORPUMP RUNNING AT A MK ii is IT RUNNING CHECK FOR THE FOLLOWING FUEL PUMP SONMECTOR e RESTRICT FUEL FLOW 8Y GR DUALLY PINCHING RUBBER PRESSURE 1S ABOVE 210 kPa 30 5 psi 2 1 bar HECK REPLACE PRESSURE FOLLOWING REGULATOR LEAKS ORLOOSE PLUGGED FUEL PUMP FILTER If OK REPLACE FUEL PUMP ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 57 CHART A 7 Page 2 of 2 FUEL SYSTEM DIAGNOSIS 1 71 THROTTLE BODY
52. n the Miscellaneous Tests Crank Tests mode to monitor cranking speed information VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
53. pping This too is normal This test uses the Tech 1 Scan tool to command the idle air control controlled idle speed The elec tronic control module issues commands to obtain commanded idle speed The node lights each should flash red and green to indicate a good circuit as the electronic control module issues commands While the sequence of color is not important if either light is OFF or does not flash red and green check the circuits for faults beginning with poor terminal con tacts Diagnostic Aids A slow unstable or fast idie may be caused by a non idle air control system problem that cannot be over come by the idle air control valve Out of control range idle air control Scan tool counts will be above 60 if idle is too low and zero counts if idle is too high The following checks should be made to repair a non idle air control system problem Vacuum Leak High Idle If idle is too high stop the engine Fully extend low idie air control with tester Start engine If idle speed is above 800 revo lutions per minute locate and correct vacuum leak including crankcase ventilation svst m Also check for binding of throttle blade or linkage System too lean High Air Fuel Ratio The idle speed may be too high or too low Engine speed may vary up and down and disconnecting the idle air control valve does not help Code 44 may be set Tech 1 Scan tool oxygen voltage will be less than 300 mV 0 3 volt Check for
54. pulses Tech 1 Scan tool reading should closely match the speedometer reading with the drive wheels tuming and vehi cle speed over about 3 km h Disregard a Code 24 set when drive wheels are not tuming Test Description Number s below refer to circled 4 This test must be done using a voltmeter and will number s on the diagnostic chart pani for the 12 volts p vehicle speed sensor input si circuit electronic Code 24 will set if the following conditions exist for Set module p y longer than seconds 5 This is the ignition feed circuit that supplies operat Codes 21 22 33 and 34 are not set ing power to the vehicle speed sensor Engine revolutions per minute are between 2000 6 This circuit supplies the ground path for vehicle and 4400 speed sensor operation If this circuit is open vehi Manifold absolute pressure is less than 23 kPa Cle speed sensor cannot pulse vehicle speed sensor The throtle is closed input signal circuit to ground Vehicle speed signal indicates less than or equal Diagnostic Aids 10 km h m oe 0 E E e The Tech 1 Scan tool should indicate a vehicle l This test uses the Scan tool to verify the vehicle speed whenever the drive wheels are tuming greater speed sensor sensor operation than 3 km h 2 The electronic control module supplies 12 volts to vehicle speed sensor input signal circuit but this sig nal will not light the test light This step verifies that S
55. re Low pressure reads a low voltage while a high pressure reads a high voltage If the manifold absolute pressure sensor fails the electronic control module will substitute a fixed manifold absolute pressure value and use the throtle position sensor to control fuel delivery Test Description Number s below refer to circled number s on the diagnostic chart 1 Code 33 will set if e Engine has been running Malfunction Code 21 or 22 are not set position sensor less than 1 6 Manifold absolute pressure sensor signal voltage is too high greater than 76 kPa of pressure for a time greater than approximately five seconds Engine misfire or a low unstable idle may set Code 33 Disconnect manifold absolute pressure sensor electrical connector and system will use a default manifoid absolute pressure value If the misfire or idle condition remains see Symptoms in Section 19B If the electronic control module recognizes and the Tech 1 Scan tool displays the low manifold absolute pressure signal the electronic control mod ule and wiring are OK Diagnostic Aids Tf the idle is rough or unstable refer to Symp ioms Section 2 9B for items which can cause an unstable idle ra An open in octane adjustment intake air tempera ture sensor and manifold absolute pressure sensor ground circuit Circuit 69 70 Black wire from manifold absolute pressure sensor connector terminal 10 el
56. rned ON by the ignition relay when the engine is running Test Description Number s below refer to circled 5 If the air conditioning fuse was open check the air number s on the diagnostic chart ee fuse circuits generator circuits for ms 1 Code 13 will set Diagnostic Aids 4 ine 1 Ni Engine as been running Konger tian 40 If the oxygen sensor heaters are not operating prop Engine coolant temperature greater than 77 system may go into Open Loop after extended Throttle position sensor signal above 6 about idle 2 2 above closed mode volage Normal voltage varies between 10 mV to 1000 mV Oxygen sensor signal voltage steady between 0 and 1 0 volt while in Closed Loop Code 13 sets 350 and 550 millivolts for 3 seconds in one minute if voltage remains between 350 and 550 If the conditions for a Code 13 exist the system will millivolt however the system will go Open Loop in not go into Closed Loop about 15 seconds 2 This test checks the oxygen sensor s heating ele i jon ment The heating element resistance should be 3 5 Soe ta in Symptoms Sect ohms at 20 C or 13 2 ohms at 595 C At room tem Ni d perature 20 the heater resistance should be 3 5 oxygen supply inside the oxygen sensor is n c 4 50 normally it should be about 3 80 essary for proper oxygen sensor operation This supply 3 This will determine if the sensor is at fault of o
57. s to confirm Refer to Fuel System Diag nosis CHART A 7 Exhaust Leaks if therc is an exhaust leak the engine can cause outside air to be pulled into the exhaust leak and past the oxygen sensor Vacuum or crankcase leaks can cause a lean condition If the above OK it is a faulty oxygen sensor Manifold Absolute Pressure Sensor Check for a shifted sensor that could cause a lean exhaust but not set a Code 33 or 34 Refer to CHART C ID VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA e B ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 83 CODE 44 LEAN EXHAUST INDICATION 1 7L THROTTLE BODY INJECTION NIVA DT RUN WARM ENGINE 65 C 5 C AY 1200 REVOLUTIONS PER MINUTE FOR TWO MINUTES DOES TECH 1 INDICATE OXYGEN SENSOR VOLTAGE FIXED BELOW 0 35 VOLT 150 REFERTO OWAGNOSTIC AIDS SON FACING AFTER REPAIRS START ENGINE CLEAR CODES AND CONFIRM NO CHECK ENGINE LIGHT VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA 2 84 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 25 PINK BLACK black fusehokder 20 SROWN ELECTRONIC CONTROL MODULE OXYGEN SENSOR INPUT SIGNAL OXYGEN SENSOR GROUND ELECTRICALLY HEATED EXHAUST GAS ENGINE GROUND OXYGEN SENSOR Attaches to engine at ignition module bracket CODE 45 RICH EXHAUST INDICATION 1 7L THROTTLE BODY INJECTION NIVA Circuit Description The electronic control module applies a re
58. tall at closed throttle coastdown speeds due to wrong vehicle speed sensor input signal circuit is not short Vehicle speed data to electronic control module ed to voltage source Refer to Intermittents in Symptoms Section By probing vehicle speed sensor input signal circuit 2 9B with the test light several times a second a vehicle Speed signal should be generated and displayed on the Scan tool If vehicle speed signal is not present engine may w VAZ SERVICE MANUAL THROTTLE 8ODY INJECTION NIVA w Ux ENGINE MANAGEMENT SYSTEMS 1 71 THROTTLE BODY INJECTION 2 71 i 24 NO VEHICLE SPEED SIGNAL 1 7L THROTTLE BODY INJECTION NIVA DISREGARD CODE 24 IF SET WHILE DRIVE WHEELS ARE NOT TURNING f ATTACH TECH 1 SCAN TOOL SELECT FQ DATA LIST e RAISE VEHICLE SO THAT ALL TIRES CAN ROTATE FREELY i WITH ENGINE IDLING IN GEAR TECH 1 SCAN TOOL SHOULD DISPLAY KM H ABOVE 0 DOES IT N ENGINE NOT INTERMITTENT 4 VEHICLE SPEED 5 REFER DIAGNOSTIC WITH TEST LIGHT J 341424 E CONNECTEO TO GR ge PRONE VEHICLE sp SPEED SENSOR AIDS ON FACING PAGE INPUT SIGNAL CIRCUIT CIRCUIT 30 GREEN WIRE To ELECTRONIC CONTROL MODULE TERMINAL 7A 107 IS LIGHT ON p E 2 USING TEST UGHT 1 34342 8 MOMENTARAY TOUCH VEHICLE SPEED REPAIR SHORT TO VOLTAGE IN SENSOR INPUT SIGNAL CIRCUIT CIRCUIT 30 GREEN WIRE
59. xygen is supplied through the oxygen sensor wires All oxygen sensor wires and connections should be 4 For this test use only a high impedance digital volt inspected for breaks or contamination that could prevent meter This test checks the continuity of Circuit 32 i ensor Pink wire and Circuit 33 Brown White wire If Cir 6161629 oxygen from reaching the oxygen 5 cuit 33 Brown White wire is open the electronic control module voltage on Circuit 32 Pink wire will be over 600 mV VAZ SERVICE MANUAL THROTTLE BODY INJECTION Be j LE 9 8 ENGINE MANAGEMENT SYSTEMS 1 7L THROTTLE BODY INJECTION 2 59 CODE 13 m OXYGEN SENSOR ENGINE AT NORMAL OPERATING TEMPERATURE 85 C 95 C SIGNAL a RUN ENGINE ABOVE 1200 REVOLUTIONS PER MINUTE FOR TWO MINUTES 1 THR m DOES TECH 1 SCAN TOOL INDICATE CLOSED LOOP AE J HRO T NA A YES i IGNITION OFF CODE 13 IS INTERMITTE i DISCONNECT OXYGEN SENSOR HARNESS CONNECTOR ADOMONAL CODES WE m lt CONNECT TEST UGHT J 34142 8 BETWEEN HARNESS TERMINALS 8 REFER TO DIAGNOSTIC AIDS AND O IGNITIONJON AS TESTUG TCONTI i m USING DIGITAL VOLT OHM AMP MULTIMETER J 23689 MEASURE amp CONNECT TEST LIGHT TO HARNESS H RESISTANCE BETWEEN OXYGEN TERMINAL E ANO GROUND SENSOR TERMINALS 8 AND D e IS TEST UGHT ON 15 RESISTANCE BETWEEN 3 5 OHMS 13 2 OHMS CONNECTO 5 1 bueren LY E ejt TO JUMPER RARNE GC 31P
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