C1632

C1631, C1632 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 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 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 "C1631" or "C1632" detected?
YES - Proceed to diagnosis procedure. Refer to C1631.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect 4WAS front control unit harness connector.
3. Check the voltage between 4WAS front control unit harness connector terminal and ground.





4. Turn the ignition switch ON.

CAUTION:
Never start the engine.
5. Check the voltage between 4WAS front control unit harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Check the following items. Repair or replace the malfunctioning parts.
- 40A fusible link (#I) open
- Short among 40A fusible link (#I) connector, 4WAS front control unit harness connector No. 11 terminal and the ground
- Open between the battery and 4WAS front control unit harness connector No. 11 terminal
- 10A fuse (#3) open
- Short among 10A fuse (#3) connector, 4WAS front control unit harness connector No. 15 terminal and the ground
- Short among 10A fuse (#3) connector, unified meter and A/C amp harness connector No. 53 terminal and the ground
- Open between the ignition switch and 4WAS front control unit harness connector No. 15 terminal
- Battery or ignition switch
2.CHECK 4WAS FRONT CONTROL UNIT GROUND
Check the continuity between 4WAS front control unit harness connector terminal and the ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace the harnesses and connectors.
3.CHECK TERMINAL
Check 4WAS front control unit harness connector pin terminal and connection for disconnection.
Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace the specific malfunctioning part.
4.CHECK INFORMATION
- Check that any item below is applicable when the malfunctions occur.
- The engine stall occurs while driving or stopping the vehicle.
- When detecting the charging system error
Is the item applicable?
YES - Check the error system.
- Perform ECM symptom diagnosis. Refer to Symptom Related Diagnostic Procedures.
- Perform the symptom diagnosis for the charging system. Refer to Symptom Related Diagnostic Procedures.
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)".