C1604

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.

2. DTC REPRODUCTION PROCEDURE

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


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" [1][2]Electrical Diagrams.

1. CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF to ON.

CAUTION:
Never start the engine.
2.Check voltage between torque sensor 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 "Diagnosis Procedure" C1601.

2. CHECK TORQUE SENSOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between torque sensor 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 torque sensor harness connector terminal and ground.

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





3.Start the engine.
4.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 malfunctioning. Replace steering column assembly. Refer to "Removal and Installation" Removal And Installation.

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. Refer to "Removal and Installation" Removal And Installation.
NO- Repair or replace malfunctioning component.