Toyota 90-93 Celica & 89-92 Corolla OBD1 Codes

Preparatory Conditions

Battery voltage 11 Volt minimum
Closed throttle position (CTP) switch full closed
Transmission in neutral position
All auxiliary equipment, including air conditioning, switched OFF
Engine at normal operating temperature

Accessing Trouble Codes

Switch ignition ON. Do NOT start engine.
Corolla – jump DLC terminals T and E1 with a short lead 1
Celica – jump DLC terminals T and E1 with a short lead 2
Count MIL flashes and compare with trouble code table below
First flashes of .5 second duration indicate ‘tens’, after a 1.5 second pause, next flashes of .5 second duration indicate ‘units’
A 2.5 second pause occurs between codes
After a 4.5 second pause, trouble codes will be repeated
Switch ignition OFF
Remove jump lead

Clearing Trouble Codes

Ensure ignition switched OFF
Corolla – remove STOP fuse (15A) from LH kick panel fusebox. 5 Wait 60 seconds.
Celica – remove EFI fuse (15A) from underhood fusebox. 6 Wait 20 seconds.
Reinstall fuse
Repeat accessing procedure to ensure no data remains in ECM fault memory

Trouble Codes

90-93 Celica 1.6L Engine Code: 4A-FE
90-93 Celica 2.2L Engine Code: 5S-FE
89-92 Corolla 1.6L Engine Code: 4A-FE
Trouble code	Fault location	Probable cause
11	Engine control module (ECM) -supply voltage	Wiring, ignition switch, engine control relay, ECM
12	Engine speed (RPM) sensor -circuit	Wiring, RPM sensor, ECM
13	Engine speed (RPM) sensor -above 1000 rpm	Wiring, RPM sensor, ECM
14	Ignition reference signal -no signal	Wiring, ignition module/coi/, ECM
16	Transmission control signal malfunction	ECM
21	Heated oxygen sensor (H02S) -circuit	Wiring, H02S, ECM
22	Engine coolant temperature (ECT) sensor -circuit	Wiring, ECT sensor, ECM
24	lntake air temperature (lAT) sensor -circuit	Wiring, /AT sensor, ECM
25	Mixture control -continuously lean	Wiring, injector, H02S, ECT/MAP sensor, intake/fuel/ignition system, ECM
26	Mixture control -continuously rich	Wiring, injector, fuel system, co/d start injector, H02S, ECTIMAP sensor, ECM
27	Heated oxygen sensor (H02S)-rear-circuit	Wiring, H02S, ECM
31	Manifold absolute pressure (MAP) sensor -circuit	Wiring, MAP sensor, ECM
41	Throttle position (TP) sensor -circuit	Wiring, TP sensor, ECM
42	Vehicle speed sensor (VSS) -circuit	Wiring, VSS, ECM
43	Starter signal -circuit	Wiring, ignition switch, ECM
51	Switch signal -NC switch ON during diagnosis	Wiring, A/C switch, A/C amplifier, ECM
51	Switch signal -closed throttle position (CTP) switch OFF during diagnosis	Wiring, CTP switch, ECM
51	Switch signal-park/neutra! position (PNP) switch not in P or N during diagnosis	Wiring, PNP switch, ECM
52	Knock sensor (KS) -circuit	Wiring, KS, ECM
53	Knock control -malfunction	ECM
71	Exhaust gas recirculation (EGR) system malfunction	Hose leak!blockage, wiring, EGRT sensor, EGR solenoid, ECM

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9 Comments

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Karen Ritchie

5 years ago

1993, Toyota Corolla flashes 4 times then short pause then 2 times then long pause then repeats. What do these codes mean?

Justin

3 years ago

I have a 1993 Toyota Corolla and it’s throwing a code 41 I did the tps sensor and still the car won’t start would that code make a car not start

Nathaniel Olson

Reply to Justin

Yes. That will cause the car to not start. The crankshaft position sensor will too. There is known problems with these corollas with the throttle tps wiring.

Podo

4 years ago

4A-GE flashes countless times

Amias 91 Yoda Cel.

91 2.2 5sp Celica giving me code 13 which is the rpm sensor ecm over 1k rpm but car won’t start after inspecting wiring and sensor idk why, please help.

Frank

1992 toyota celica st coupe 1.6 AutoMatic 4a fe eng. OBD 1 faut code 25 and 17fault code.

Alex Tessenar

6 years ago

I have a 91 toyota celica its flashing a code 15 but there isnt one listed

Frank Mina

Reply to Alex Tessenar

93 Toyota celica st coupe 2door1.6 4afe engine a/t transmission W/Overdrive ,still getting a code17. I’m confused thers no code 17 on my repair manual.

Zak

My Toyota Corolla AE91 after following diagnosis procedure, the check engine is flashing 6 times only.
What could be the error code for this?
Thanks in advance.