Toyota OBD1 Trouble Codes and Fault Code List >> Land Cruiser 4.5L (1993 – 1994)

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.
• ECM trouble codes can be accessed with suitable code reader connected to the data link connector (DLC) [1] or displayed by the MIL.

Preparatory conditions

• Battery voltage 11 V minimum.
• Closed throttle position (CTP) switch fully closed.
• Transmission in neutral position.
• All auxiliary equipment, including air conditioning, switched OFF.
• Engine at normal operating temperature.

Accessing – Normal mode

• Switch ignition ON. Do NOT start engine.
• Check MIL illuminates.
• Switch ignition OFF.
• Jump DLC terminals TE1 and E1 with a short lead [1].
• Switch ignition ON.
• 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’ [2].
• A 2.5 second pause occurs between codes.
• After a 4.5 second pause, trouble codes will be repeated.

NOTE: The MIL ffashes once every 0.25 seconds if the system is correct [3]

• Switch ignition OFF.
• Remove jump lead.

Accessing- Test mode

• Carry out preparatory conditions as in normal mode.
• Jump DLC terminals TE2 and E1 with a short lead [1].
• Switch ignition ON. Do NOT start engine.
• Check MIL is flashing to confirm test mode is operating.

NOTE: Test mode will not be activated if the DLC terminals are connected after the ignition switch is turned ON.

• Start the engine.
• Drive vehicle over 10 mph to simulate possible fault conditions.
• Stop vehicle.
• Jump DLC terminals TE1 and E1 with a short lead [1].
• Count MIL flashes and compare with trouble code table.
• Switch ignition OFF.
• Remove jump leads.

Erasing

• Ensure ignition switched OFF.
• Remove EFI fuse (15A) from underhood fusebox 9.
• Wait 30 seconds.
• 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