C1621

C1621, C1622 4WAS FRONT ACTUATOR





DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.RECHECK DTC
With CONSULT-III
1. Start the engine.

CAUTION:
Never drive the vehicle.
2. Steer 360� leftward slowly. Then steer 360� rightward to return the steering wheel to the straight-ahead position. Repeat the same service for 1 minute or more.

NOTE:
The protection function mode (overheat protection) activates and the system stops if steering repeats for a long time.
3. Perform self-diagnosis for "4WAS(FRONT)".
Is DTC "C1621" or "C1622" detected?
YES - Proceed to diagnosis procedure. SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK 4WAS FRONT MOTOR CIRCUIT
Check 4WAS front motor circuit. SEE Component Inspection (4WAS Front Motor).
Is the inspection result normal?
YES - GO TO 2.
NO - Replace 4WAS front actuator. Removal And Installation.
2.CHECK 4WAS FRONT MOTOR CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect 4WAS front actuator harness connector.
3. Disconnect 4WAS front control unit harness connector.
4. Check the continuity between 4WAS front actuator harness connector and 4WAS front control unit harness connector.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace error-detected parts.
3.PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
1. Connect 4WAS front actuator harness connector.
2. Connect 4WAS front control unit harness connector.
3. Turn the ignition switch OFF to ON.
4. Perform self-diagnosis for "4WAS(FRONT)".
Is DTC "C1621" or "C1622" detected?
YES - Replace 4WAS front control unit. 4WAS Front Control Unit.
- Before replacing 4WAS front control unit, record the self-diagnosis results (history). Refer to
SEE Special Repair Requirement.
NO - GO TO 4.
4.CHECK INFORMATION
With CONSULT-III
Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. 4WAS Main Control Unit, "Reference Value".
Is each data the standard value?
YES - Check each harness connector pin terminal for disconnection.
NO - Replace 4WAS front control unit. 4WAS Front Control Unit.
- Before replacing 4WAS front control unit, record the self-diagnosis results (history). SEE Special Repair Requirement.




Component Inspection (4WAS Front Motor)
1.CHECK 4WAS FRONT MOTOR
1. Turn the ignition switch OFF.
2. Disconnect 4WAS front actuator harness connector.
3. Check the resistance between 4WAS front actuator harness connectors.





4. Check the continuity between 4WAS front actuator harness connector and the ground.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace 4WAS front actuator. Removal And Installation.




Special Repair Requirement
Before replacing 4WAS front control unit, record the self-diagnosis results (history).

CAUTION:
- Never erase the memory (history) of self-diagnosis results when replacing 4WAS front control unit after diagnosis.
- Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR".