Mitsubishi OBD / OBD2 Codes >> Mighty Max Pickup 2.4/3.0L – Montero 3.0L (1989 – 1996)

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].


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.


  • 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