Toyota OBD/OBD2 Codes >> Celica 1.8/2.2L – Corolla 1.6/1.8L (1993 – 1995)

Model Year Engine identification System
Celica  1.8L 1994-95 7A-FE TCCS
Celica 2.2L 1994-95 5S-FE TCCS
Corolla  1.6L 1993-95 4A·FE TCCS
Corolla  1.8L 1993-95 7A·FE TCCS

General information

  • Engine control module (ECM) incorporates self-diagnosis function.
  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to workshop.
  • ECM trouble codes can be displayed by the MIL or accessed with suitable code reader connected to the data link connector (DLC):
o Corolla- 1
o Celica – 2

Preparatory conditions

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

Accessing – Normal mode

  • Switch ignition ON. Do NOT start engine.
  • Check MIL illuminates.
  • Switch ignition OFF.
  • Corolla- jump DLC terminals TE1 and E1 with a short lead [1]
  • Celica- jump DLC terminals TE1 and E1 with a short lead [2]
  • Switch ignition ON.
  • Count MIL flashes and compare with trouble code table.
  • First flashes of 0.5 second duration indicate ‘tens’, after a 1.5 second pause, next flashes of 0.5 second duration indicate ‘units’ [3]
  • A 2.5 second pause occurs between codes.
  • After a 4.5 second pause, trouble codes will be repeated.

NOTE: The MIL flashes once every 0.25 seconds if the system is correct [4].

  • Switch ignition OFF.
  • Remove jump lead.

Accessing – Test mode

  • Carry out preparatory conditions as in normal mode.
  • Corolla- jump DLC terminals TE2 and E1 with a short lead [1].
  • Celica- jump DLC terminals TE2 and E1 with a short lead [2]
  • Switch ignition ON. Do NOT start engine.
  • Check MIL is flashing to confirm test mode is operating.

NOTE: Test mode will not be activated if the DLC terminals are connected after the ignition switch is turned ON.

  • Start the engine.
  • Drive vehicle over 10 mph to simulate possible fault conditions.
  • Stop vehicle.
  • Jump DLC terminals TE1 and E1 with a short lead [1] or [2]
  • Count MIL flashes and compare with trouble code table.
  • Switch ignition OFF.
  • Remove jump leads.

Erasing

  • Ensure ignition switched OFF.
  • Corolla- remove EFI fuse (15A) from underhood fusebox [5].
  • Celica- remove EFI fuse (15A) from underhood fusebox [6]
  • Wait 30 seconds.
  • Reinstall fuse.
  • Repeat checking procedure to ensure no data remains in ECM fault memory.

NOTE: Disconnecting battery ground lead will also erase trouble codes but may erase memory from electronic units such as radio.

Trouble code identification

Flash code

Fault location

Probable cause

12

Engine speed (RPM) sensor- circuit

Wiring, RPM sensor, ECM

13

Engine speed (RPM) sensor – above 1500 rpm

Wiring, RPM sensor, ECM

14

Ignition reference signal – no signal

Wiring, ignition module, ECM

16

Transmission control signal – malfunction

ECM

21

Heated oxygen sensor (H02S)- front- circuit

Wiring, H02S, ECM

22

Engine coolant temperature (ECT) sensor – circuit

Wiring, ECT sensor, ECM

24

Intake air temperature (IAT) sensor- circuit

Wiring, IAT sensor, ECM

25

Mixture control – continuously lean

Wiring, injector, H025, intake/fuel/ignition system, valve timing, ECM

26

Mixture control – continuously rich

Wiring, injector, intake/fuel system, valve timing, 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, instrument cluster, ECM

43

Starter signal – circuit

Wiring, ignition switch, engine control relay, ECM

51

Switch signal – AIC switch ON during diagnosis

Wiring, AIC switch, AIC amplifier, ECM

51

Switch signal – closed throttle position (CTP)

switch OFF during diagnosis

Wiring, CTP switch, ECM

51

Switch signal – park/neutral position (PNP)

switch not in P or N during diagnosis

Wiring, PNP switch, ECM

52

Knock sensor (KS) – circuit

Wiring, KS, ECM

71

Exhaust gas recirculation (EGR) system – malfunction

Hose leak/blockage, wiring, EGRT sensor, EGR solenoid, ECM