Toyota OBD/OBD2 Codes >> Land Cruiser 4.0L (1988 – 1994)

Model Year Engine identification System
Land Cruiser 4.0L 1988-94 3F-E   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.
  • Trouble codes can be displayed by the MIL or accessed with suitable code reader connected to the data link connector (DLC):
0 1988-90 – 1
0 1991-94- 2

Accessing – MIL

  • Switch ignition ON.
  • Check MIL illuminates.
  • Start engine. Allow to idle.
  • If MIL extinguishes, no trouble codes have been recorded.
  • If MIL remains illuminated, access trouble codes.

Accessing – trouble codes

  • Switch ignition ON. Do NOT start engine.
  • 1988-90- jump DLC terminals Tand E1 with a short lead [1]
  • 1991-94- jump DLC terminals Tand E1 with a short lead [2]
  • 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.

Erasing

  • After the faults have been rectified, erase the trouble codes as follows:
  • 1988-90 :- remove EFI fuse (15A) from LH fascia panel fusebox for 30 seconds minimum [5]
  • 1991-94 -remove EFI fuse (15A) from underhood fusebox for 30 seconds minimum [6]
  • 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 locati on

Probable cause

11

Engine control module (ECM) power supply

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/coil, ECM

21

Heated oxygen sensor (H02S) 1 – 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, H02S, ECTNAF sensor, intake/fuel/ignition system, ECM

26

Mixture control – continuously rich

Wiring, injector, fuel system, cold start injector, H02S, ECTNAF sensor, ECM

28

Heated oxygen sensor (H02S) 2 – circuit

Wiring, H02S, ECM

31

Volume air flow (VAF) sensor- circuit

Wiring, VAF sensor, ECM

32

Volume air flow (VAF) sensor- circuit

Wiring, VAF sensor, ECM

35

Barometric pressure (BARO) sensor- circuit

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 – A/C 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/neutral position (PNP)

switch not in P or N during diagnosis

Wiring, PNP switch, ECM

52

Knock sensor (KS) 1 – circuit

Wiring, KS, ECM

53

Knock control – malfunction

ECM

55

Knock sensor (KS) 2 :- circuit

Wiring, KS, ECM

71

Exhaust gas recirculation (EGR) system – malfunction

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

81

Transmission control module (TCM) – communication

Wiring

83

Transmission control module (TCM) – communication

Wiring

84

Transmission control module (TCM) – communication

Wiring

85

Transmission control module (TCM) – communication

Wiring