Toyota
Nissan Versa
 Sedan Service Manual
Steering » Steering control system (STC) » C1604 Torque sensor
Diagnosis Procedure

Regarding Wiring Diagram information, refer to STC "Wiring Diagram".

1.CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF to ON.

    CAUTION: Never start the engine.

  2. Check voltage between EPS control unit harness connector terminal and ground.

    CAUTION: Steering wheel in neutral position. (There is no steering force.)   

Is the inspection result normal?

YES >> GO TO 2.

NO >> Perform the trouble diagnosis for battery power supply circuit. Refer to STC "Diagnosis Procedure".

2.CHECK TORQUE SENSOR GROUND CIRCUIT

  1. Turn ignition switch OFF.
  2. Check continuity between EPS control unit harness connector terminal and ground.

    CAUTION: Steering wheel in neutral position. (There is no steering force.)       

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.

3.CHECK TORQUE SENSOR SIGNAL

  1. Turn ignition switch OFF to ON.
  2. Check voltage between EPS control unit harness connector terminal and ground.

    CAUTION: Steering wheel in neutral position. (There is no steering force.)       

  3. Start the engine.
  4. Check voltage between EPS control unit harness connector terminal and ground while turning the steering wheel.                                                       

Is the inspection result normal?

YES >> GO TO 4.

NO >> Torque sensor is malfunctioning. Replace steering column assembly. Refer to ST "Removal and Installation".

4.CHECK CONNECTOR

  1. Turn ignition switch OFF.
  2. Disconnect EPS control unit harness connector.
  3. 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 STC "Removal and Installation".

NO >> Repair or replace malfunctioning component.

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