C1651

C1651 IGNITION POWER SUPPLY





Description
4WAS system function is controlled by transmitting the ignition switch signal to 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 4WAS front control unit self-diagnosis.
Is DTC "C1651" detected?
YES - Proceed to diagnosis procedure. Refer to C1651.
NO - INSPECTION END




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





Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace the harnesses and connectors.
2.CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY
1. Start the engine.

CAUTION:
Stop the vehicle.
2. Check the voltage between 4WAS front control unit harness connectors.





Is the measurement value "9 V" or less?
YES - Check the following items. Repair or replace the malfunctioning parts.
- 4WAS front control unit harness connector pin terminal and connection
- 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 No. 53 terminal and the ground
- Open between the ignition switch and 4WAS front control unit harness connector No. 15 terminal
- Ignition switch
NO - GO TO 3.
3.CHECK 4WAS FRONT CONTROL UNIT SIGNAL
With CONSULT-III
1. Start the engine.

CAUTION:
Stop the vehicle.
2. Check "IGN VOLT" item on "DATA MONITOR" of 4WAS front control unit.
Does the item on "DATA MONITOR" indicate "16 V" or more?
YES - 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)".