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Troubleshooting Withvolt Ohmmet

1. To Theft Deterrent Check starter OK Check wiring between ECU terminal STA operation and ignition switch terminal ST1 BAD O iF J Repair or replace Check wiring between ECU terminal E1 and body and Try another ECU Repair or replace Check fusible link battery wiring BAD aogoppanoooonon Seen w m CCK ignition switch and neutral start FRPR SmM Race switch OK Check that there is voltage at STA 50 terminal of starter IG SW START STD voltage 6 14 V OK NO Check wiring between ignition switch Check starter terminal ST1 and starter terminal 50 FI 42 EFI SYSTEM Troubleshooting with Volt Ohmmeter No Terminals _ Trouble Condition _ STD Voltage 8 ict e No voltage iding S 10 Ignition Switch AM2 ae IG2 To a Tachometer AM2 H Fuse y 30A Igniter w Fusible MAIN Ignition Coil Link 3 0w r Battery _L_ Check that there is voltage between ECU terminal IGT and body ground Idling N Repair or replace Try another ECU Check fusible link and ignition switch Repair or replace OK Check distributor See page G 8 FI2771 Repair or replace OK Check wiring between ECU and VN i battery epair or replace OK Check igniter BAP Repair or replace Fl 43 EFI SYSTEM Troubleshooting with Volt Ohmmeter g isc1 ISC4 E1 ignition SW ON
2. B in the illustration which can be easily broken c Reconnect the connectors to the engine and ECT ECU HINT e Perform all voltage measurements with the connectors connected popEODOQOUDQOO e Verify that the battery voltage is 11 V or more when the ignition switch is in the ON position Using a voltmeter with high impedance 10 kQ v minimum measure the voltage at each terminal of the wiring connectors FI2911 Terminals of Engine and ECT ECU eo POWERGROUND c2 ostren so AC COMPRESSOR G L1 T TT T L2 o FPR K L3 W HT_ OXYGEN SENSOR HEATER SUB OXYGEN SENSOR Ww WARNING LIGHT A D CRUISE CONTROL COMPUTER STP STOP LIGHT SWITCH SHIFT POSITION SWITCH ISC1 ISC MOTOR NO 1 COIL WATER TEMP SENSOR M REL EFI MAIN RELAY COIL IGT IGNITER THROTTLE POSITION SENSOR M SHIFT POSITION SWITCH ISC2 ISC MOTOR NO 2 COIL AIR TEMP SENSOR P_ SHIFT POSITION SWITCH s1 ECT SOLENOID THROTTLE POSITION SENSOR S SHIFT POSITION SWITCH cs vs KEN VC STA NSW E01 E02 Ooi OD1 NE O SP pet OD2 es SP2 STI COLDSTARTINJECTOR GO oisTRiBuTOR t TEMSECUL oo eGR vsveeR frock m ma S O Oot Oo FPR KNK OB HT A D IGT G2 G1 VE E2 E1 x1 NK STP ISC3 ISC MOTOR NO 3 COIL yS AIR FLOW METER IGSW IGNITION SWITCH 2 ECT SOLENOID EGR GAS TEMP SENSOR B EFI MAIN RELAY AIR FLOW METER R NO 4 COIL TT ISC4 ISC MOTOR NO
3. FI6029 See page Fl 34 Check wiring between ECU terminal E1 and body ground pu a i Jogoo PHF d CIE Fd dh HR aad eal poate nl taian Voltmeter OK BAD Check air flow meter See page FI 66 Repair or replace BAD OK Replace air flow meter o Ep Try another ECU Ohmmeter i Check wiring between ECU and air flow meter OK BAD Repair or replace ov Saar saans FI 38 EFI SYSTEM Troubleshooting with Volt Ohmmeter No voltage Ignition SW ON Ignition Switch AM2 a4 1G2 n AM2 H Fuse 30A Fusible MAIN Link 3 0W R Injector Battery ES There is no voltage between ECU terminals No 10 No 20 and or No 30 and E01 and or E02 IG SW ON O Check that there is voltage between ECU terminal No 10 No 20 and or No 30 and body ground NO OK Check wiring between ECU terminal E01 and or E02 and body ground OK BAD Try another ECU Repair or replace Repair or replace Check resistance of magnetic coil in each injector STD resistance Approx 13 8 Q Check fusible links and ignition switch Ft6028 BAD Replace injector Repair or replace Check wiring between ECU terminal No 10 No 20 and or No 30 and battery FI 39 EFI SYSTEM Troubleshooting with Volt Ohmmeter iti Intake air t ture 20 C Air Temp Sensor Air Flow Meter Check that there is voltage between ECU terminal B B1 and bod
4. 9 14V EFI Main Relay ISC Valve 15A e H Fuse DA Fusible MAIN k 3 0W Link Battery There is no voltage between ECU terminals ISC1 ISC4 d E1 IG SW ON ISC1 ISC2 ISC3 ISC4 an Check that there is voltage between ECU terminal B B1 and body ground IG SW ON OK NO Refer to No 1 See page Fl 34 Check wiring between ECU terminal E1 and body ground l OK BAD Check ISV valve See page FI 73 Repair or replace BAD OK FI2757 Replace ISC Check wiring between ECU and EFI valve main relay BAD Repair or replace EFI SYSTEM Troubleshooting with Volt Ohmmeter N voltige No trouble CHECK engine warning g light off and engine running STD Voltage 8 14V CHECK Engine Warning Light Q GAUGE 7 5A Combination Meter A There is no voltage between ECU terminals W and E1 Idling Check that there is voltage between ECU terminal W and body ground NO OK Check wiring between ECU terminal E1 and body ground OK BAD ETT SER EREE REESE E ESS eee 0e 8 SF Se aaa se Try another ECU Repair or Replace Voltmeter Check GAUGE fuse 7 5 A and CHECK engine warning light BAD Repair or replace Fuse blows again Check wiring between ECU terminal w BAD and fuse Repair or replace FI 45 EFI SYSTEM Troubleshooting with Volt Ohmmeter A C E1 ON Air conditi
5. Trouble Condition STD Voltage BATT E1 No voltage 10 14 V IGSW E1 No voltage Ignition switch ON 10 14 V MREL EI Ignition switch ON 10 14 V B B1 E1 Ignition switch ON 10 14 V e EFI 15A Ignition Switch EFI Main Relay Fuse Fusible Link e BATT E1 1 There is no voltage between ECU terminals BATT and E1 Check that there is voltage between ECU terminal BATT and body ground NO OK FI2753 Check wiring between ECU terminal El and body ground OK BAD Oo wv oo a oOOOOOoOng ps bpanaava e F Try another ECU Repair or replace Check fuse and fusible link OK Replace Check wiring between ECU terminal and battery Repair or replace FI 33 EFI SYSTEM Troubleshooting with Volt Ohmmeter e IG SW E1 D There is no voltage between ECU terminals IG SW and E1 IG SW ON Check that there is voltage between ECU terminal IG SW and body ground IG SW ON NO OK Check wiring between ECU terminal E1 and ground OK BAD Try another ECU Repair or replace Check fuse fusible link and BAD ignition switch AEPA DENEPIACe M REL E1 There is no voltage between ECU terminals M REL and E1 IG SW ON Check that there is voltage between ECU terminal M REL and body ground IG SW ON NO OK Check wiring between ECU terminal E1 and ground To XP am 1a qP onn
6. or replace OK Check air flow meter BAD Repair or replace OK Check operation of oxygen sensors OK System normal BAD BAD Check wiring between oxygen sensors and Repair wiring ECU connectors l A gi l Repair oxygen sensors iva maltungiion Check Connector Fl 47 EFI SYSTEM Troubleshooting with Volt Ohmmeter California Specification Vehicles Only ECU EGR Gas Temp Sensor FI2680 D There is no voltage between ECU terminals THG and E2 IG SW ON 2 Check that there is voltage between ECU terminal B B 1 and body ground IG SW ON OK NO Refer to No 1 See page FI 34 Check wiring between ECU terminal E1 and body ground OK BAD Repair or replace BAD Repair or replace Check EGR system OK Check EGR gas temp sensor See page FI 81 Ohmmeter BAD OK Check wiring between ECU and Replace EGR gas EGR gas temp sensor temp sensor OK BAD Try another ECU Repair or replace
7. 4 CO pve Dre ror oNsenson Pr ee ECT SOLENOID 2 SENSOR GROUND EFI MAIN RELAY LS HEAD LIGHT RELAY Engine and ECT ECU Terminals LAL OOU staja c sex se2 Tr Fen w mew P sw par eo SS red eS S oale for veier 3 e2 feowfoorfood ufafafe e er California specification vehicies only f FI2796 FI 31 EFI SYSTEM Troubleshooting with Volt Ohmmeter Voltage at Engine and ECT ECU Wiring Connectors 1 IG SW E1 mE M REL E1 Ignition SW ON 10 14 B B1 E1 IDL E2 Throttle valve open 4 6 Ignition SW ON Throttle valve fully closed 0 1 1 0 VTA E2 Throttle valve fully open 3 2 4 2 Ignition SW ON Measuring plate fully closed 3 7 4 3 3 Measuring plate fully open 0 2 0 5 VS E2 FI 34 FI 3 5 FI 36 FI 37 Idling 2 i 1 0 2 0 w f N O 00 3 000 rpm No 10 E01 Ignition SW ON 10 14 FI 38 E02 No 10 Ignition SW ON Intake air temperature 20 C 68 F T8 Ignition SW ON Coolant temperature 80 C 176 F idling 0 7 1 0 Fl 42 ISC1 E1 Ignition SW ON 9 14 Fl 43 ISC4 tof wer a CHECK engine warning light off and engine 8 14 AIC E1 Ignition SW ON Air conditioning ON 10 14 Engine and ECT ECU Terminals FI 39 0 1 1 0 FI 40 6 14 Fl 41 California specification vehicles only FI2796 EFI SYSTEM Troubleshooting with Volt Ohmmeter No Terminals _
8. EFI SYSTEM FI 29 Troubleshooting with Volt Onmmeter TROUBLESHOOTING WITH VOLT OHMMETER HINT The following troubleshooting procedures are designed for inspection of each separate sys tem and therefore the actual procedure may vary somewhat However troubleshooting should be performed referring to the inspection methods de scribed in this manual Before beginning inspection it is best to first make a simple check of the fuses fusible links and condition of the connectors The following troubleshooting procedures are based on the supposition that the trouble lies in either a short or open circuit in a component out side the computer or a short circuit within the computer If engine trouble occurs even though proper operating voltage is detected in the computer connector then it can be assumed that the engine ECU is faulty and should be replaced LOCATION OF FUSES AND FUSIBLE LINK Fusible Link MAIN 3 0W No 1 Junction Block Fuse IGN 7 5A Fuse GAUGE 7 5A H Fuse H Fuse ALT 100A AM1 40A O 7 A LJ OQUO G R No 2 Junction a Block H Fuse Fuse EFI 20A AM2 30A FI13734 FI 30 EFI SYSTEM Troubleshooting with Volt Ohmmeter EFI SYSTEM CHECK PROCEDURE PREPARATION a Disconnect the connectors from the engine and ECT ECU b Remove the locks as shown in the illustration so that the tester probe s can easily come in NOTICE Pay attention to sections A and
9. FI 68 J See page F1 68 Repair or replace throttle Check wiring between ECU position sensor and throttle position sensor OK Try another ECU Ohmmeter FI 36 EFI SYSTEM Troubleshooting with Volt Ohmmeter e VC E2 D There is no voltage between ECU terminals VC and E2 IG SW ON Check that there is voltage between ECU terminal B B1 and body ground IG SW ON OK NO Refer to No 1 Check throttle position See page FI 34 sensor See page FI 68 See page F1 68 BAD OK Check wiring between ECU and throttle position sensor OK BAD Repair or replace Ohmmeter Repair or replace wiring Try another ECU e VTA E2 D There is no voltage at ECU terminals VTA and E2 IG SW ON Check that there is voltage between ECU terminals VC and E2 IG SW ON OK FI2783 Refer to VC E2 trouble section 3 Check throttle position sensor ene Repair or replace OK Check wiring between ECU and BAD 7 throttle position sensor Repair or replace OK See page F1 68 Try another ECU Ohmmeter FI 37 EFI SYSTEM Troubleshooting with Volt Ohmmeter av en 1 i o ing 2 BV 3000rm 200 ECU Air Flow Meter D There is no voltage between ECU terminals VC or VS and E2 IG SW ON Check that there is voltage between ECU terminal B B1 and body ground IG SW ON Refer to No 1
10. ocogoogo2oaog OOOORRCY a imine auuemens poong j Try another ECU Repair or replace Check EFI main relay and wiring BAD Replace harness OK FI2761 Try another ECU FI 34 EFI SYSTEM Troubleshooting with Volt Ohmmeter e B B1 E1 There is no voltage between ECU terminals B B1 and E1 IG SW ON Check that there is voltage between ECU terminal B B1 and body ground IG SW ON FI2911 NO OK Check wiring between ECU terminal E1 and ground OK BAD Try another ECU Repair or replace Check fuse fusible link and wiring BAD harness Repair or replace OK Check EFI main relay See page FI 76 Replace Refer to M REL E1 trouble section FI 35 EFI SYSTEM Troubleshooting with Volt Ohmmeter No Terminais Trouble Condition STD Voltage IDL E2 Throttle valve open g SW ON Throttle valve fully closed 0 1 1 0 V VTA E2 Throttle valve fully open 3 2 4 2 V Throttle Position Sensor O There is no voltage between ECU terminals IDL and E2 IG SW ON Throttle valve open O Check that there is voltage between ECU terminal B B1 and body ground IG SW ON OK Check wiring between ECU terminal E1 and body ground OK BAD Try another ECU Repair or replace Refer to No 1 Repair or replace See page FI 34 asses 3 Check throttle position sensor BAD BAD
11. oning ON 10 14V To A C Amplifier A C Compressor oogoggoggogg goocpggog Check that there is voltage between ECU terminal A C and body ground NO OK Check wiring between ECU terminal E1 and body ground OK BAD Try another ECU Repair or replace Check compressor running Check wiring between ECU terminal A C and amplifier BAD Repair or replace Repair or replace Repair or replace Check that there is voltage between amplifier terminal and body ground OK Check wiring between amplifier and ECU or compressor FI 46 EFI SYSTEM Troubleshooting with Volt Ohmmeter California Specification Vehicles only Check Connector Oxygen Sensor To EF Main Relay OE FI6033 1 There is no voltage between ECU terminals VF and E1 Check that there is specified voltage between ECU terminal VF and body ground NO l OK Check wiring between ECU terminal E1 and body ground OK BAD Try another ECU Repair or replace Check for suction of air into exhaust system BAD OK Check for air leak from air intake system OK Repair air suction Siae Repair air leak BAD Repair or replace Check spark plugs OK Check distributor and ignition system etal Repair or replace OK Check fuel pressure BAD Repair or replace OK ge BAD ad 0 Aan Check injectors Repair or replace OOA go ad A aod OK o Check cold start injector BAD Repair
12. y ground IG SW ON Refer to No 1 See page FI 34 Check wiring between ECU terminal E1 and body ground OK Check air temp sensor See page Fl 66 BAD OK a Replace air flow Check wiring between ECU and air meter temp meter OK BAD Air Flow Meter Ohmmeter ff Try another ECU Repair or replace FIT253 FI 40 EFI SYSTEM Troubleshooting with Volt Ohmmeter STD Voltage Ignition Coolant temperature 80 C SW ON 176 F 0 1 1 0 V Q B B1 No Terminals HEE Water Temp Sensor Trouble No voltage 1 There is no voltage between ECU terminals THW and E2 IG SW ON Check that there is voltage between ECU terminal B B1 and body ground IG SW ON OK NO Refer to No 1 See page FI 34 Check wiring between ECU terminal E1 and body ground OK BAD Check water temp sensor See page FI 78 Repair or replace BAD Replace water temp sensor FI2757 Check wiring between ECU and water temp sensor A Ohmmeter BAD Try another ECU A Repair or replace FI3646 Fl 41 EFI SYSTEM Troubleshooting with Volt Ohmmeter Cranking 6 14V To Circuit Opening Neutral Relay STA Start Ignition Switch Canada Switch H Fuse AMI A a eS a TE ASTA AM1 x ALT H Fuse 100A 40A Fusible MAIN aa Link amp 3 0W Starter f Relay Starter USA j Battery a Terminals Trouble No voltage

Troubleshooting Withvolt Ohmmet

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