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. .
NO- INSPECTION END
Diagnosis Procedure
1. CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT
1.Turn ignition switch ON.
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 OFF to 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.
4.Check Voltage between EPS control unit harness connector terminal and ground.
CAUTION:
Steering wheel is right or left turn.
Is the inspection result normal?
YES- GO TO 4.
NO- Torque sensor is malfunction. Replace steering column assembly. 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. Exploded View.
NO- Repair or replace error-detected parts.