| ModeL | Year | Engine identification | System |
|---|---|---|---|
| Montero 3.0L 12V | 1994-95 | 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 certain sensors fail, to enable car to be driven to workshop.
- Trouble codes can be accessed with a voltmeter or a suitable code reader connected to the data link connector (DLC).
Accessing
- Ensure ignition switched OFF.
- Connect an analogue voltmeter between data link 2 4 connector (DLC) 1 [1] [2] terminal 4 or 5 and DLC 2 [1] [1] terminal 25.
- Switch ignition ON. Do NOT start engine.
- Voltmeter should be pulsing.
o 1.5 second pulses indicate the ‘tens’ of the trouble code [2] [A].o 0.5 second pulses indicate the ‘units’ of the trouble code [2] [B].o A 0.5 second pause separates each pulse [2] [C].o A 2 second pause separates ‘tens’ and ‘units’ [2] (D].o A 3 second pause separates each trouble code [2] [E].o For example: Trouble code 24 displayed [2].
- If no trouble codes are stored, short pulses will continue to be displayed.
- If continuous voltage is displayed: Suspect faulty engine control module (ECM).
- Count voltmeter pulses and compare with trouble code table.
- Switch ignition OFF.
- Remove voltmeter.
Erasing
- Ensure ignition switched OFF.
- Disconnect battery ground lead for 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 | Heated oxygen sensor (H02S) – front – malfunction | Wiring, H025, 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 |
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 |