Diagnosis Procedure
- CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch ON.
- Check voltage between EPS control unit harness connector terminals and ground.
CAUTION: Steering wheel is neutral position. (There is no steering force.)EPS control unit - Voltage Connector Terminal M327 13 Ground Approx. 5 V Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform the trouble diagnosis for battery power supply circuit. Refer to "Diagnosis Procedure ".
- CHECK TORQUE SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Check continuity between EPS control unit harness connector terminal and ground.
CAUTION: Steering wheel is neutral position. (There is no steering force.)EPS control unit - Continuity Connector Terminal M327 15 Ground Existed Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK TORQUE SENSOR SIGNAL
- Turn ignition switch OFF to ON.
- Check Voltage between EPS control unit harness connector terminal and ground.CAUTION: Steering wheel is neutral position. (There is no steering force.)
EPS control unit - Voltage Connector Terminal M327 14 Ground Approx. 2.5 V 16 - Start the engine.
- Check Voltage between EPS control unit harness connector terminal and ground.
CAUTION: Steering wheel is right or left turn.EPS control unit - Voltage Connector Terminal M327 14 Ground Approx. 1.6 V - 3.4 V
(The value is changed according to steering left or right)16 Is the inspection result normal?
YES >> GO TO 4.
NO >> Torque sensor is malfunction. Replace steering column assembly. Refer to "REMOVAL AND INSTALLATION ".
- CHECK CONNECTOR
- Turn ignition switch OFF.
- Disconnect EPS control unit harness connector.
- Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
Is the inspection result normal?
YES >> Replace EPS control unit. Refer to "Exploded View ".
NO >> Repair or replace error-detected parts.