C1654

C1654 4WAS FRONT ACTUATOR RELAY





Description
- It performs control inside 4WAS front control unit.
- The actuator relay turns ON when turning the ignition switch ON.
- When turning the ignition switch from ON to OFF, the actuator relay remains ON and is turned OFF after a few minutes due to the 4WAS front control unit 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 self-diagnosis for "4WAS(FRONT)".
Is DTC "C1654" detected?
YES - Proceed to diagnosis procedure. SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK 4WAS FRONT MOTOR GROUND
1. Turn the ignition switch OFF.
2. Disconnect 4WAS front control unit harness connector.
3. Check the continuity between 4WAS front control unit harness connector terminal and the ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace the harnesses and connectors.
2.CHECK 4WAS FRONT MOTOR POWER SUPPLY (1)
1. Check the voltage between 4WAS front control unit harness connector terminal and ground.





2. Turn the ignition switch ON.

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





Is the measurement value "9 V" or less?
YES - GO TO 3.
NO - GO TO 4.
3.CHECK 4WAS FRONT MOTOR 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.
NO - Repair or replace error-detected parts.
4. 4WAS FRONT CONTROL UNIT SIGNAL INSPECTION
With CONSULT-III
1. Start the engine.

CAUTION:
Never drive the vehicle.
2. Check "MOTOR VOLT" item on "DATA MONITOR" for "4WAS(FRONT)".
Does the item on "DATA MONITOR" indicate "16 V" or more?
YES - 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".