C1633

C1633 4WAS FRONT CONTROL UNIT





Description
- Each sensor signal controls 4WAS front actuator.
- The fail-safe functions stops the rear wheel angle function (the front wheel is the steering wheel cutting angle) when the electric components and the mechanical components are malfunctioning.
- The protection function stops 4WAS system temporarily when:
- 4WAS system continues being high load/overheat condition.
- The input signal is not transmitted to 4WAS front control unit.
- 4WAS front control unit and 4WAS main control unit control the 4WAS system by 4WAS communication line to optimize control.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.RECHECK DTC
With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform 4WAS front control unit self-diagnosis.
Is DTC "C1633" detected?
YES - Proceed to diagnosis procedure. Refer to C1633.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK 4WAS FRONT CONTROL UNIT (1)
With CONSULT-III
1. Start the engine.

CAUTION:
Stop the vehicle.
2. Check "THERM TEMP" on "DATA MONITOR" of 4WAS front control unit.
3. Steer the steering wheel 360� leftward slowly and then steer 360� rightward. Return the steering wheel to the straight-ahead position. Repeat the same service for 3 minutes.
4. Check "THERM TEMP" on "DATA MONITOR" of 4WAS front control unit.
Is DATA MONITOR value difference between before and after the service 3� or less?
YES - Replace 4WAS front control unit. Refer to Exploded View.
NO - GO TO 2.
2.CHECK 4WAS FRONT CONTROL UNIT (2)
With CONSULT-III
1. Start the engine.

CAUTION:
Stop the vehicle.
2. Check "THERM TEMP" item on "DATA MONITOR" of 4WAS front control unit.
3. Steer the steering wheel 360� leftward slowly and then steer 360� rightward. Return the steering wheel to the straight-ahead position. Repeat the same service for 3 minutes.
4. Check "THERM TEMP" item on "DATA MONITOR" of 4WAS front control unit.





Is the inspection result normal?
YES - GO TO 3.
NO - Replace 4WAS front control unit. Refer to Exploded View.
3.CHECK INFORMATION
- Check that any item below is applicable when malfunction occurs.
- Entering and exiting the garage (Frequent steering)
- When steering the steering wheel for a long time
Is the item applicable?
YES - 4WAS system protection function mode (overheat protection)(4WAS system temporary stop)
NO - Replace 4WAS front control unit. Refer to Exploded View.




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".

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)".