Toyota OBD/OBD2 Codes >> Toyota 90-93 Celica & 89-92 Corolla

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 ┬áT 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

6 Replies to “Toyota 90-93 Celica & 89-92 Corolla”

  1. 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.

    1. 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.

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

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