C1632

C1631, C1632 4WAS FRONT CONTROL UNIT





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 self-diagnosis for "4WAS(FRONT)".
Is DTC "C1631" or "C1632" detected?
YES - Proceed to diagnosis procedure. SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY (1)
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 3.
NO - GO TO 2.
2.CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 40A fusible link (Q).
3. Check the harness for open or short between 4WAS front control unit harness connector No.11 terminal and 40A fusible link (Q).
Is the inspection result normal?
YES - Perform the trouble diagnosis for power supply circuit. Battery Power Supply, "Wiring Diagram - BAT-
TERY POWER SUPPLY -".
NO - Repair or replace error-detected parts.
3.CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY (3)
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 5.
NO - GO TO 4.
4.CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY (4)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#3).
3. Disconnect fuse block (J/B) harness connector.
4. Check the continuity between 4WAS front control unit harness connector and fuse block (J/B).





5. Check the continuity between 4WAS front control unit harness connector and the ground.





Is the inspection result normal?
YES - Perform the trouble diagnosis for ignition power supply circuit. Ignition Power Supply, "Wiring Diagram -
IGNITION POWER SUPPLY -".
NO - Repair or replace error-detected parts.
5.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 6.
NO - Repair or replace the harnesses and connectors.
6.CHECK TERMINAL
Check 4WAS front control unit harness connector pin terminal and connection for disconnection.
Is the inspection result normal?
YES - GO TO 7.
NO - Repair or replace the error-detected parts.
7.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. Engine Control System Symptoms (VQ37VHR), Engine Control System Symptoms, "Symptom Table" (VK56VD).
- Perform the symptom diagnosis for the charging system. Symptom Related Diagnostic Procedures.
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.




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".