TROUBLESHOOTING WITH VOLT OHMMETER
Contents
1. EG1 311 3S GTEENGINE SMPISYSTEM Calif only is no voltage between PCME terminals THG and E2 IG SW ON oo that there is voltage between PCME terminal B or 81 and body ground IG SW ON OK NO Refer to No 1 See page EG1 296 Check wiring between PCME terminal E1 and body ground OK BAD Repair or replace Check EGR system BAD See page EG1 243 Repair or replace F12757 OK Cas EGR function sensor See page EG1 404 EGR Function Sensor BAD Check wiring between PCME and EG R Replace EGR function function sensor Sensor 1 IN O A BAD Try another PCME Repair or replace Fi2674 V009102. switch and ignition main relay Check resistance between B of solenoid resistor and each other terminal STD resistance 4 6Q OK NO Check resistance of each injector Replace STD resistance 2 4Q resistor OK AD B Replace injector Repair or replace wiring Check wiring between PCME and resistor OK Try another PCME EG1 302 Terminals Intake Air Temp Sensor Air Flow Sensor FI2767 y SODOOONROOO ROOD POOODOOOOnCH fo a eee fu E E a 5 a a ao oe reese cease ae Oe ee I PETTEE 7 z dl x E FI2757 Air FLow Sensor Onmmeter F253 3S GTE ENGINE SMPISYSTEM Intake air temperature 20 C 0 5 3 4 V es is no voltage between PCME terminals THA and E2 IG SW ON Check that there is voltage between PCME terminal B 131 and body ground IG SW ON OK Check wiring between PCME terminal E1 and body ground OK Ori intake air temp sensor See page EG1 358 0 K NO Refer to No 1 See page EG1 296 BAD Repair or replace BAD Replace air flow sensor O Try another PCME Check wiring between PCME and intake air temp sensor K BAD Repair or replace VO00901 EG1 303 3S GTE ENGINE SMPISYSTEM THW E2 IG SW ON Coolant temperature 80 C 176 F 0 2 1 0 V Engine Coolant Temp Sensor FI3572 Gy ok that there is voltage between PCME terminal B B1 and body ground IG SW ON Refer
3. to No 1 See page EG1 296 Eer err e Feet cerns Peet Check wiring between PCME terminal E1 and body ground OK BAD Check engine coolant temp sensor See page EG1 378 Repair or replace BAD OK F12757 Replace engine coolant Check wiring between PCME and engine temp sensor coolant temp sensor Engine Coolant OK BAD Temp Sensor Try another PCME Repair or replace 00902 EG1 304 3S GTEENGINE SMPISYSTEM ra staze Novotes EV or more Ignition Switch Clutch Start Switch STA Starter Relay gt E1 Qi is no voltage between PCME terminals STA and El IG SW ON REHEARSE i operation and ignition switch terminal ST2 BAD OK BAD Repair or replace cy k wiring between PCME terminal E1 and body ground BAD OK Try another PCME Repair or replace Check fuse H fuse fusible link battery wiring ignition switch clutch BAD Repair or replace FI2755 start switch and starter relay Voltmeter OK ee that there is voltage at starter terminal 50 Starter IG SW START STD voltage 6 V or more OK NO h Check wiring between ignition switch Check starter terminal ST2 and starter terminal 50 yoodd3 Terminal 50 EG1 305 3S GTEENGINE SMPISYSTEM Ea IGT E1 No voltage Idling Pulse generation Ignition Switch To Tachometer ignition Coil Ignition Igniter G IGT Main 7 0 IGF T B attery L Rel ay FI5740 1 There is no vo
4. 362 pes Check wiring between PCME and 2AN throttle position sensor Repair or replace ji X x Try another PCME EG1 300 No Terminals Trouble VC E2 No voltage VS E2 Air Flow Sensor FI6032 PEER FI2757 Ohmmeter 3S GTE ENGINE SMPI SYSTEM IG SW ON IG SW ON body ground IG SW ON OK OK 3 Check air flow sensor See page EG1 358 BAD Repair or replace air flow sensor Try another PCM E e EEEE FI1283 Measuring plate fully closed Measuring plate fully open g i 16 41 V 1 There is no specified voltage at PCM E terminals VC or VS and E2 2 Check that there is voltage between PCM E terminal B 131 and NO Refer to No 1 See page EG1 296 Check wiring between PCME terminal E1 and body ground BAD Repair or replace OK Check wiring between PCM E and air flow sensor OK BAD Repair or replace EG1 301 3S GTE ENGINE SMPISYSTEM o emas J oe OOOO o ooa _ o B Solenoid GEENE MAIN 1 20 30 40 AM2 ae d ignition I Main T gt Battery Relay 3 _L moe AIAG FIS737 There is no voltage between PCME terminals 1 2 3 and or 4 and E01 and or E02 IG SW ON Check that there is specified voltage between solenoid resistor terminal B and body ground STD voltage 9 14 V OK NO Check fuse H fuse fusible link wiring BAD Repair or replace ignition
5. EG1 293 3S GTE ENGINE SMPISYSTEM TROUBLESHOOTING WITH VOLT OHMMETER HINT ecoxt o1 e The following troubleshooting procedures are designed for inspection of each separate system and therefore the actual procedure may vary somewhat However troubleshooting should be performed while referring to the inspection methods described in this manual e Before beginning inspection it is best to first make a simple check of the fuses H fuses fusible link and the condition of the connectors e The following troubleshooting procedures are based on the supposition that the trouble lies in either a short or open circuit within the computer e f engine trouble occurs even though proper operating voltage is detected in the computer connector then it can be assumed that the PCME is faulty and should be replaced EGOXU 01 FUSES H FUSES AND FUSIBLE LINK LOCATION EF 15A GAUGE 7 5A FIS810 EG1 294 3S GTE ENGINE SMPISYSTEM SMPI SYSTEM CHECK PROCEDURE PREPARATION a Disconnect the connectors from the PCME 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 B in the Illustration which can be easily broken c Reconnect the connectors to the PCME HINT e Perform all voltage measurements with the con nectors connected e Verify that the battery voltage is 11 V or more when the ignition switch is in the ON
6. als B or B1 and E1 IG SW ON j D 1 AOCOROOO DOOR Ana aramee rere iy Gisele 2 Check that there is voltage between PCME terminal B or B1 and body ground IG SW ON NO OK FI2911 3 Check wiring between PCME terminal E1 and body ground OK BAD Try another PCM E Repair or replace Check fuses N fuse fusible link and BAD ignition switch Repair or replace OK Check M PI main relay BAD See page EG1 374 Replace aa melt julai a J OK Check wiring between MPI main BAD relay and battery Repair or replace FI2765 EG1 297 3S GTEENGINE SMPISYSTEM io ominas rowe OOOO coon OOO S soona 2 eame wovon OOOO o w Battery FI5738 1 There is no voltage between PCME terminals BATT and E1 Sratiesnvence Choncars tenggeene 2 Check that there is voltage between PCME terminal BATT and Se body ground E15 NO 3 Check wiring between PCME terminal E1 and body ground OK OK BAD Try another PCME Repair or replace BAD Check fuse H fuse and fusible link BAD OK a Check wiring between PCME terminal FI2754 and battery Repair or replace FI2755 EG1 298 3S GTEENGINE SMPISYSTEM No Terminals Trouble onamo sTo ge tote CO y v No voltage IG SW ON Throttle valve fully closed VTA E2 Throttle opener must be cancelled first Throttle valve fully open 3 2 4 9 V Throttle Position Sensor e IDL E2 TSS is no voltage betwe
7. en PCME terminals IDL and E2 IG SW ON Throttle valve open Check that there is voltage between PCME terminal B B1 and body ground IG SW ON NO OK Check wiring between PCME terminal E1 and body ground OK BAD Try another PCM E Repair or replace Refer to No 1 BAD Renai See page EG1 296 epair or replace check throttle position sensor BAD See page EG1 362 BAD Repair or replace Check wiring between PCME and throttle position sensor throttle position sensor OK Try another PCME 00897 FI2762 FI2767 Throttle Position Sensor FI4757 EG1 299 3S GTEENGINE SMPISYSTEM VC E2 as is no voltage between PCME terminals VC and E2 IG SW ON Check that there is voltage between PCME terminal B B1 and body ground IG SW ON OK NO FI2764 ue throttle position sensor Refer to No 1 See page EG1 362 See page EG1 296 BAD OK Check wiring between PCM E and throttle Repair or replace position sensor Ohmmeter OK Repair or replace Try another PCM E wiring ey gt i VTA et aS a AEE tans eee es ee ee L ae f POCECE EEEO a Ones is no specified voltage at PCME terminals VTA and E2 IG SW ON Check that there is voltage between PCME terminals VC and E2 IG Sw ON FI2763 OK Refer to VC E2 trouble section 1 ort F Pn i aeur i p BAD Check throttle position sensor Repairorteplacs See page EG1
8. ltage between PCME terminals IGT and E1 Idling PCME lt o o EEEE Momo oocoOoocou OOO Voltmeter T7 CN 2 Check that there is voltage between PCME terminal IGT and body Ei ground idling NO I OK erminal E1 and body ground Replace OK Check fuse H fuse fusible link ignition Repair or replace switch and ignition main relay OK BAD Check distributor See IG section Repair or replace OK Check wiring between PCME and BAD battery Repair or replace OK BAD Check igniter See IG section Repair or replace FI2771 FI2756 EG1 306 3S GTE ENGINE SMPISYSTEM Ignition Switch Battery SESS ERE RR vend Geceewewe 17 a Za nea p ee Voitmeter FI2757 RSC B B RSO Ohmmeter IG SW ON and body ground IG SW ON OK Check resistance between IACV BAD 3 terminals B and RSC or RSO STD resistance 17 7 23 9 0 Check wiring between PCME and BAD IACV Try another PCME OK OK PCME connecters disconnected 9 14V Ge is no voltage between PCME terminals RSC or RSO and E1 Oe that there is voltage between PCME terminal B B1 NO Refer to No 1 See page EG1 296 Replace IACV Repair or replace wiring EG1 307 3S GTE ENGINE SMPISYSTEM No trouble CHECK engine warning light off To Ignition Switch 1G1 CHECK Engine Warning Light Combination Meter FIO728 qe is no vol
9. position Using a voltmeter with high impedance 10 k amp 2 V minimum measure the voltage at each terminal of the wiring connectors EG1 295 3S GTEENGINE SMPI SYSTEM PCME Wiring Connectors Voltage Condition STD voltage V B IGS WON 9 14 EG1 EG1 BATT E1 IDL E2 Throttle valve open VC E2 4 5 5 5 lt e A IN co L IN Cp 49 49 l de ow Se N NO NO T O O O O O O oo NO O 00 N O EG1 Throttle valve fully closed Throttle opener must be cancelled first 0 3 0 8 VTA E2 VC E2 Measuring plate fully closed Measuring plate fully open VS E2 Idling 3 000 rom 1 2 E01 3 E02 4 THA E2 Intake air temp 20 C 68 F 0 5 3 4 IG SW ON THW E2 Coolant temp 80 C 176 F 0 2 1 0 IG SW ON Throttle valve fully open 3 2 4 9 4 5 5 5 4 0 5 5 0 2 0 5 EG1 1 6 4 1 1 0 2 0 IG SW ON 9 14 EG1 301 EG1 EG1 OO O K 6 or more EG1 STA E1 Cranking IGT E1 Idling Pulse generation EG1 305 i E1 IG SW ON PCME connectors disconnected EG1 306 foo owa No trouble CHECK engine warning light off and engine Banas running PIM E2 12 VC E2 13 AC E1 IG SW ON PCM E Terminals IG SW ON EG1 296 3S GTEENGINE SMPISYSTEM No Terminals Trouble Condition STD voltage B B17 E1 No voltage IG SW ON 9 14V PCME FI5742 1 There is no voltage between PCME termin
10. tage between PCME terminals W and E1 Idling Qe that there is voltage between PCME terminal w and body ground NO OK F12772 Check wiring between PCME terminal E1 and body ground OK BAD A Repair or replace Check fuse GAUGE 7 5 A and check engine warning light s BAD Repair or replace F 3 Fuse blows again Eome odo w o ea EN OERG Rai J E eee A e Check wiring between PCME BAD Repair or replace terminal W and fuse 00906 Fi2756 EG1 308 3S GTEENGINE SMPISYSTEM PIM E2 No voltage IG SW ON VC E2 STD voltage 2 5 4 5 V Manifold Absolute Pressure Sensor i There is no voltage between PCME terminals PIM or VC and E2 IG SW ON Check that there is voltage between PCME terminal B or 131 and body ground OG SW ON OK NO Refer to No 1 See page EG1 296 3 Check wiring between PCME terminal E1 and body ground OK BAD Check manifold absolute pressure sensor See page EG1 400 Repair or replace BAD OK Replace manifold absolute pressure sensor Check wiring between PCME and manifold absolute pressure sensor OK BAD Try another PCME Repair or replace FI2755 VOO907 EG1 309 3S GTE ENGINE SMPISYSTEM 3 Ac E O No voltage Air conditioning ON 9 14V To A C Amplifier A C Compressor F10922 1 There is no voltage between PCME terminals AC and E1 Air conditioning ON 2 Check that there is voltage bet
11. ween PCME terminal AC and body ground K NO O 3 Check wiring between PCME terminal E1 and body ground BAD OK Try another PCME Repair or replace Check wiring OK between PCME Check compressor running terminal AC and BAD amplifier FI9219 Repair or replace Check that there is voltage between BAD or amplifier terminal and body ground epair or replace OK SND Check wiring between amplifier and E peer E PCME or compressor epair or replace yO0908 EG1 310 3S GTEENGINE SMPISYSTEM Oxygen Sensor To MPI Main Relay FIG035 here is no voltage between PCME terminals VF and E1 Check that there is specified voltage between PCME terminals VF and body ground NO OK Check wiring between PCME terminal E1 and body ground BAD Ok Try another PCME Repair or replace BAD a Check for air suction into exhaust system Repair air suction Fi3575 OK BAD Check for air leak from air intake system HBA Repair air leak ay BAD Check spark plugs Repair or replace OK Check distributor and ignition system Repair or replace A BAD A BAD Check fuel pressure BAD Repair or replace os BAD Check injectors Repair or replace OK OK E N T mo Repair or replace OK Check air flow sensor Repair or replace or Check operation of oxygen sensor System normal BAD Check wiring between oxygen sensor BAD and PCME connectors rene OK Replace oxygen sensor Rich malfunction only
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