C1608

Description

EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal to the
EPS motor according to the driving condition.


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. CHECK SELF-DIAGNOSIS RESULTS

With CONSULT
Perform self-diagnosis for "EPS" with CONSULT.





Is above displayed on the self-diagnosis display?
YES- Proceed to diagnosis procedure. .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK CONNECTOR

With CONSULT
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.
4.Reconnect connectors and then perform self-diagnosis for "EPS" with CONSULT.
Is any item indicated on the self-diagnosis display?
YES- GO TO 2.
NO- Poor connection of connector terminal. Repair or replace connector.

2. CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect EPS control unit harness connector.
3.Turn ignition switch ON.

CAUTION:
Never start the engine.
4.Check voltage between EPS control unit harness connector terminals and ground.





5.Turn ignition switch OFF.
6.Check voltage between EPS control unit harness connector terminals and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace malfunctioning components.

3. CHECK EPS CONTROL UNIT GROUND CIRCUIT

1.Check continuity between EPS control unit harness connector terminal and ground.





2.Connect EPS control unit harness connector.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair open circuit or short to ground or short to power in harness or connectors.

4. CHECK DTC

With CONSULT
Perform self-diagnosis for "EPS" with CONSULT.
Is "C1608 CONTROL UNIT" indicated in self-diagnosis display?
YES- Replace EPS control unit. Exploded View.
NO- INSPECTION END


Special Repair Requirement


1. ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Special Repair Requirement. (VDC models)
- END