C1633

C1633 4WAS FRONT CONTROL UNIT

Description
^ Each sensor signal controls 4WAS front actuator.
^ The fail-safe functions stops the rear wheel angle (the front wheel is the steering wheel cutting angle) when the electric components and the mechanical components are malfunctioning.
^ The protection function mode stops 4WAS system intermittently when 4WAS system continues high loaded condition and overheat condition or the input signal does not transmit to 4WAS front control unit.
^ 4WAS front control unit and 4WAS main control unit control the best control of 4WAS system by 4WAS communication line.

DTC Logic

DTC DETECTION LOGIC

C1633:

DTC CONFIRMATION PROCEDURE

1. RECHECK DTC

With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform 4WAS front control unit self-diagnosis.
Is DTC "C1633" detected?
YES >> Proceed to diagnosis procedure. Refer to: "Diagnosis Procedure".
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.
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.

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.

Special Repair Requirement

BEFORE REPLACING 4WAS FRONT CONTROL UNIT
^ Record the self-diagnosis results (history).

CAUTION:
^ Replace it without erasing 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" when erasing the memory of the self-diagnosis results (record).

AFTER REPLACING 4WAS FRONT CONTROL UNIT
^ Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT: Special Repair Requirement (Pattern 3)". Programming and Relearning