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Autodata - Diagnostic Trouble Codes Fault locations and probable causes - 2004 edition

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Model: Celica 1,6 Celica 1,8 Celica 2,O<br />

Engine management<br />

<strong>Trouble</strong> code identification<br />

4A-GE 1985-90 - with manifold absolute pressure (MAP) sensor<br />

Flash type <strong>Fault</strong> location<br />

Probable cause<br />

1 1 No fault found I -<br />

2 I Manifold absolute pressure (MAP) sensor I Wiring, MAP sensor, ECM<br />

3 1 Ignition amplifier - signal I Wiring, ignition amplifier, ECM<br />

4 Engine coolant temperature (ECT) sensor - openlshort<br />

I circuit<br />

Wiring, ECT sensor, ECM<br />

6 Crankshaft position (CKP) sensorlengine speed (RPM) Wiring, CKPIRPM sensor, ignition amplifier, ECM<br />

sensor - no signal<br />

7<br />

Throttle position (TP) sensor - openlshort circuit Wiring, TP sensor, ECM<br />

8<br />

Intake air temperature (IAT) sensor - openlshoFt circuit Wiring, IAT sensor, ECM<br />

9<br />

Vehicle speed sensor (VSS)- signal<br />

Wiring, VSS, ECM<br />

10 1 Starter signal I Wiring, ignition switch, ECM<br />

I I<br />

Switch signal - AC switch ON during diagnosis<br />

Switch signal - PNP switch not in P or N during diagnosis<br />

Switch signal - throffle position (TP) sensor, NO closed<br />

throttle signal during diagnosis<br />

Wiring, AC switch, AC control module, ECM<br />

Wiring, PNP switch, ECM<br />

Wiring, TP sensor, ECM<br />

Except 4A-GE 1985-90 - with manifold absolute pressure (MAP) sensor<br />

Flash type <strong>Fault</strong> locatlon<br />

11111 No fault found<br />

11 Engine control module (ECM)- power suppty<br />

Crankshaft position (CKP) sensorlcamshaft position<br />

l2 1 (CMP) sensor - no signal<br />

I<br />

Wiring, ignition switch, engine control relay, ECM<br />

I Wiring, CKPlCMP sensor, ignition amplifier, ECM<br />

13 Crankshaft position (CKP) sensor - no signal over idle I Wiring, CKP sensor, ignition amplifier, ECM<br />

14 I Ignition signai - no signal Wiring, ignition amplifier, ECM<br />

16<br />

21<br />

22<br />

24<br />

25<br />

26<br />

31<br />

Transmission control signal<br />

Heated oxygen sensor (H02S)<br />

Engine coolant temperature (ECT) sensor - openlshort<br />

I circuit<br />

Intake air temperature (IAT) sensor - openlshort circuit<br />

Weak mixture<br />

Rich mixture<br />

Manifold absolute pressure [MAP) sensat- - circuit<br />

Volume air flow (VAF) mmr - circuit<br />

I<br />

Probable cause<br />

-<br />

Wiring, ECM<br />

Wiring, H02S, ECM<br />

Wiring, ECT sensor, ECM<br />

Wiring, IAT sensor, ECM<br />

Wiring, air leak, ignition system, fuel pressure,<br />

injector, VAF sensor, ECT sensor, IAT sensor,<br />

02SIH02S, ECM<br />

Wiring, ignition system, fuel pressure, injector, cold<br />

start injector, VAF sensor, ECT sensor, IAT sensor,<br />

02SIH02S, ECM<br />

Wiring, MAP sensor, ECM<br />

Wiring, VAF sensor, ECM

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