Diagnosis Procedure
- CHECK POWER SUPPLY (1)
- Turn the ignition switch OFF.
- Disconnect power steering control unit harness connector.
- Check the voltage between power steering control unit harness connector and ground.
Power steering control unit
--
Voltage (Approx.)
Connector
Terminal
M108
3
Ground
0 V
- Turn the ignition switch ON.CAUTION: Never start the engine.
- Check the voltage between power steering control unit harness connector and ground.
Power steering control unit
--
Voltage
Connector
Terminal
M108
3
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK POWER SUPPLY (2)
- Turn the ignition switch OFF.
- Check 10A fuse (#3).
- Disconnect fuse block (J/B) harness connector.
- Check the continuity between power steering control unit harness connector and fuse block (J/B) harness connector.
Power steering control unit
Fuse block (J/B)
Continuity
Connector
Terminal
Connector
Terminal
M108
3
M1
2A
Existed
- Check the continuity between power steering control unit harness connector and ground.
Power steering control unit
--
Continuity
Connector
Terminal
M108
3
Ground
Not existed
Is the inspection result normal?
YES
Perform trouble diagnosis for ignition power supply circuit. Refer to Wiring Diagram .
NO
Repair or replace damaged parts.
- CHECK GROUND CIRCUIT
- Turn the ignition switch OFF.
- Check the continuity between power steering control unit harness connector and ground.
Power steering control unit
--
Continuity
Connector
Terminal
M108
6
Ground
Existed
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK TERMINALS AND HARNESS CONNECTORS
Check the power steering control unit pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
INSPECTION END
NO
Repair or replace error-detected parts.