FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Infiniti >> 2009 >> G37x Coupe AWD V6-3.7L (VQ37VHR) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> C Code Charts >> C1628

C1628


C1628 4WAS FRONT ACTUATOR





Description
- Wiring connected to 4WAS front actuator is integrated with 4WAS front actuator.
- 4WAS front actuator rotates together with steering wheel.
- 4WAS front actuator mainly consists of five components. [4WAS front lock solenoid valve (lock structure), front wheel steering angle sensor, 4WAS front motor, gear shaft, and spiral cable]
- 4WAS front lock solenoid valve (lock structure) is controlled by the 4WAS front control unit, and locks/unlocks 4WAS front actuator.
- If a strong force (rotation direction) is applied to 4WAS front actuator, the locking mechanism (holder) absorbs the force and locks 4WAS front actuator.
- Front wheel steering angle sensor detects a turning angle of 4WAS front motor.
- 4WAS front motor controls number of revolutions by a command value from the 4WAS front control unit.
- Gear shaft is an output axis of 4WAS front motor. (Gear shaft = 4WAS front motor revolution + steering angle)
- Spiral cables mean the power line and signal lines of 4WAS front motor.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.RECHECK DTC
With CONSULT-III
1. Start the engine.

CAUTION:
Stop the vehicle.
2. Steer 360� leftward slowly. Then steer 360� rightward to return the steering wheel to the straight-ahead position. Repeat the same service for 1 minute or more.

NOTE:
The protection function mode (overheat protection) activates and the system stops if steering repeats for a long time.
3. Perform 4WAS front control unit self-diagnosis.
Is DTC "C1628" detected?
YES - Proceed to diagnosis procedure. Refer to C1628.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK FRONT WHEEL STEERING ANGLE SENSOR CIRCUIT (1)
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 and the ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace the harnesses and connectors.
2.CHECK FRONT WHEEL STEERING ANGLE SENSOR CIRCUIT (2)
1. Connect 4WAS front control unit harness connector.
2. Turn the ignition switch ON.

CAUTION:
Never start the engine.
3. Check the continuity between 4WAS front actuator harness connector and 4WAS front control unit harness connector.





Is the inspection result normal?
YES - GO TO 3.
NO - Replace 4WAS front control unit. Refer to Exploded View.
3.CHECK FRONT WHEEL STEERING ANGLE SENSOR CIRCUIT (3)
1. Start the engine.

CAUTION:
Stop the vehicle.
2. Steer to the straight-ahead position. Then turn the ignition switch OFF.
3. Disconnect 4WAS front actuator harness connector.
4. Apply 12 V current between 4WAS front actuator harness connector No. 10 terminal (positive) and NO. 3 terminal (negative). (Release the lock structure.)

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.
5. Slowly steer rightward and leftward alternately. Check the resistance between 4WAS front actuator harness connectors.

CAUTION:
The steering angle must be within 10� rightward and leftward.





Is the inspection result normal?
YES - GO TO 4.
NO - Replace 4WAS front actuator. Refer to Service and Repair.
4.CHECK FRONT WHEEL STEERING ANGLE SENSOR SIGNAL
With CONSULT-III
1. Connect 4WAS front actuator harness connector.
2. Start the engine.

CAUTION:
Stop the vehicle.
3. Rotate the steering wheel slowly. Check "MTR SEN U OUT", "MTR SEN V OUT" and "MTR SEN W OUT" item on "DATA MONITOR"of 4WAS front control unit.
Do all data monitor values indicate "Hi" or "Low" simultaneously?
YES - Replace 4WAS front control unit. Refer to Exploded View.
NO - Check 4WAS front actuator harness connector pin terminal for disconnection.




Component Inspection (Front Wheel Steering Angle Sensor)
1.CHECK FRONT WHEEL STEERING ANGLE SENSOR
1. Start the engine.

CAUTION:
Stop the vehicle.
2. Steer to the straight-ahead position. Then turn the ignition switch OFF.
3. Disconnect 4WAS front actuator harness connector.
4. Apply 12 V current between 4WAS front actuator harness connector No. 10 terminal (positive) and NO. 3 terminal (negative). (Release the lock structure.)

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.
5. Slowly steer rightward and leftward alternately. Check the resistance between 4WAS front actuator harness connectors.

CAUTION:
The steering angle must be within 10� rightward and leftward.





6. Connect 4WAS front actuator harness connector.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace 4WAS front actuator. Refer to Service and Repair.




Special Repair Requirement

AFTER REPLACING 4WAS FRONT ACTUATOR
- Perform 4WAS front actuator adjustment after replacing 4WAS front actuator. Refer to Special Repair Requirement (Pattern 2) Special Repair Requirement (Pattern 3), "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 2)".

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)".
pro multis Credits:Operation CHARM About Operation CHARM