C1621
C1621, C1622 4WAS FRONT ACTUATOR
Description
- Wiring connected to 4WAS front actuator is integrated with 4WAS front actuator.
- 4WAS front actuator rotates together with steering wheel.
- 4WAS front actuator mainly consists of five components. [4WAS front lock solenoid valve (lock structure), front wheel steering angle sensor, 4WAS front motor, gear shaft, and spiral cable]
- 4WAS front lock solenoid valve (lock structure) is controlled by the 4WAS front control unit, and locks/unlocks 4WAS front actuator.
- If a strong force (rotation direction) is applied to 4WAS front actuator, the locking mechanism (holder) absorbs the force and locks 4WAS front actuator.
- Front wheel steering angle sensor detects a turning angle of 4WAS front motor.
- 4WAS front motor controls number of revolutions by a command value from the 4WAS front control unit.
- Gear shaft is an output axis of 4WAS front motor. (Gear shaft = 4WAS front motor revolution + steering angle)
- Spiral cables mean the power line and signal lines of 4WAS front motor.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.RECHECK DTC
With CONSULT-III
1. Start the engine.
CAUTION:
Stop 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 4WAS front control unit self-diagnosis.
Is DTC "C1621" or "C1622" detected?
YES - Proceed to diagnosis procedure. Refer to C1621.
NO - INSPECTION END
Diagnosis Procedure
1.CHECK 4WAS FRONT MOTOR CIRCUIT
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 - GO TO 2.
NO - Replace 4WAS front actuator. Refer to Service and Repair.
2.PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
1. Connect 4WAS front control unit harness connector.
2. Perform 4WAS front control unit self-diagnosis.
Is DTC "C1621" or "C1622" detected?
YES - Replace 4WAS front control unit. Refer to Exploded View.
NO - GO TO 3.
3.CHECK INFORMATION
With CONSULT-III
Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. Refer to 4WAS Front Control Unit.
Is each data the standard value?
YES - Check each harness connector pin terminal for disconnection.
NO - Replace 4WAS front control unit. Refer to Exploded View.
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. Refer to Service and Repair.
Special Repair Requirement
AFTER REPLACING 4WAS FRONT ACTUATOR
- Perform 4WAS front actuator adjustment after replacing 4WAS front actuator. Refer to Special Repair Requirement (Pattern 2) Special Repair Requirement (Pattern 3), "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 2)".
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".
AFTER REPLACING 4WAS FRONT CONTROL UNIT
- Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to Special Repair Requirement (Pattern 2) Special Repair Requirement (Pattern 3), "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)".