| ModeL | Year | Engine identification | System |
|---|---|---|---|
| Mighty Max Pickup 2.4L | 1990-95 | 4G64 | MPI |
| Mighty Max Pickup 3.0L | 1990-96 | 6G72 | MPI |
| Montero 3.0L | 1989-93 | 6G72 | MPI |
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 using a voltmeter connected to the data link connector (DLC) [3].
Accessing
Ensure ignition switched OFF.
Access data link connector (DLC) [1] Mighty Max Pickup, or [2] Montero.
Connect analogue type voltmeter between data link connector (DLC) terminals 1 and 12 [3].
Switch ignition ON.
Count voltmeter needle deflections and compare with trouble code table.
Trouble codes will be displayed by voltmeter deflections of 1.5 seconds, indicating ‘TENS’ [4] (A], followed by voltmeter deflections of 0.5 seconds, indicating ‘UNITS’ [4] [D].
A 0.5 second pause separates each deflection [4] [B].
A 2 second pause separates ‘TENS’ and ‘UNITS’ [4] [C].
A 3 second pause separates each trouble code [4] [E].
For example: Voltmeter deflects for 1.5 seconds twice, followed by deflections of 0.5 seconds
twice, indicates trouble code 22 [4].
Switch ignition OFF.
Disconnect voltmeter.
NOTE: If a constant deflection is displayed, suspect engine control module (ECM) fault.
NOTE: If constant short pulses are displayed, no trouble code is stored.
Erasing
- Ensure ignition switched OFF.
- Wait 15 seconds minimum.
- Reconnect battery ground lead.
- Repeat checking procedure to ensure no data remains in ECM fault memory.
NOTE: Disconnecting battery ground lead may erase memory from electronic units such as radio.
Trouble code identification
| Trouble code | Fault location | Probable cause |
| 11 | Oxygen sensor (02S)/heated oxygen sensor (H02S)- front- malfunction | Wiring, 02SIH02S, fuel system, injectors, ECM |
| 12 | Volume air flow (VAF) sensor- malfunction | Wiring, VAF sensor, ECM |
| 13 | Intake air temperature (IAT) sensor – malfunction | Wiring, IAT sensor, ECM |
| 14 | Throttle position (TP) sensor – malfunction | Wiring, TP sensor, CTP switch, ECM |
| 15 | Idle speed control (ISC) actuator position sensor – malfunction | Wiring, ISC actuator position sensor sensor, ECM |
| 21 | Engine coolant temperature (ECT) sensor – malfunction | Wiring, ECT sensor, ECM |
| 22 | Crankshaft position (CKP) sensor – malfunction | Wiring, CKP sensor, ECM |
| 23 | Camshaft position (CMP) sensor- malfunction | Wiring, CMP sensor, ECM |
| 24 | Vehicle speed sensor (VSS) – malfunction | Wiring, VSS, ECM |
| 25 | Barometric pressure (BARO) sensor- malfunction | Wiring, BARO sensor, ECM |
| 36 | Ignition timing adjustment | Wiring short to ground |
| 41 | Injectors – malfunction | Wiring, injectors, ECM |
| 42 | Fuel pump – malfunction | Wiring, relay module, fuel pump, ECM |
| 43 | Exhaust gas recirculation (EGR) system – malfunction | Wiring, EGR, EGRT, EGRTVV, hose leak, ECM |
| 55 | Idle speed control (ISC) actuator position sensor – malfunction | Wiring, ISC actuator position sensor sensor, ECM |
| 59 | Heated oxygen sensor (H02S) – rear- malfunction | Wiring, H02S, fuel system, injectors, ECM |