C1604

C1604 TORQUE SENSOR

Description

Torque sensor detects the steering torque, and transmit the signal to EPS control unit.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1. DTC REPRODUCTION PROCEDURE

With CONSULT
1.Turn the ignition switch OFF to ON.
2.Perform EPS control unit self-diagnosis.
Is DTC "C1604" detected?
YES- Proceed to diagnosis procedure. .
NO- Inspection End.

Diagnosis Procedure

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 terminals and ground.

CAUTION:

Steering wheel is 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. C1601.

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

CAUTION:

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

3.Start the engine.

Check voltage between torque sensor harness connector terminal and ground while turning the steering wheel.

Is the inspection result normal?
YES- GO TO 4.
NO- Torque sensor is malfunction. Replace steering column assembly. Service and Repair.

4. CHECK CONNECTOR

1.Turn ignition switch OFF.
2.Disconnect torque sensor 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. Service and Repair.
NO- Repair or replace error-detected parts.