Mitsubishi OBD1 Trouble Codes and Fault Code List >> Mighty Max Pickup 2.4/3.0L – Montero 3.0L (1989 – 1996)

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