| 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 – 10 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 |