Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.

CHECK 4WAS FRONT CONTROL UNIT (1)
With CONSULT
1. Start the engine.
  CAUTION: Never drive the vehicle.
2. Check "THERM TEMP" on "DATA MONITOR" for "4WAS (FRONT)".
3. Steer the steering wheel 360° leftward slowly and then steer 360° rightward. Return the steering wheel to the straight-ahead position. Repeat the same service for 3 minutes.
4. Check "THERM TEMP" on "DATA MONITOR" for "4WAS (FRONT)".
  Is DATA MONITOR value difference between before and after the service 3° or less?
  
  YES: Replace 4WAS front control unit. Refer to "REMOVAL AND INSTALLATION ".
  - Before replacing 4WAS front control unit, record the self-diagnosis results (history). Refer to "SPECIAL REPAIR REQUIREMENT ".
  NO: GO TO 2.

CHECK 4WAS FRONT CONTROL UNIT (2)

With CONSULT

Start the engine.
CAUTION: Never drive the vehicle.
Check "THERM TEMP" item on "DATA MONITOR" for "4WAS (FRONT)".
Steer the steering wheel 360° leftward slowly and then steer 360° rightward. Return the steering wheel to the straight-ahead position. Repeat the same service for 3 minutes.

Check "THERM TEMP" item on "DATA MONITOR" for "4WAS (FRONT)".

Monitor item	Condition	Display value
THERM TEMP	Engine running (idling)	(-40) - (+ 100)°C

Is the inspection result normal?

YES: GO TO 3.

NO: Replace 4WAS front control unit. Refer to "REMOVAL AND INSTALLATION ".

Before replacing 4WAS front control unit, record the self-diagnosis results (history). Refer to "SPECIAL REPAIR REQUIREMENT ".

CHECK INFORMATION
- Check that any item below is applicable when malfunction occurs.
  - Entering and exiting the garage (Frequent steering)
  - When steering the steering wheel for a long time
  Is the item applicable?
  
  YES: 4WAS system protection function mode (overheat protection) (4WAS system temporary stop)
  
  NO: Replace 4WAS front control unit. Refer to "REMOVAL AND INSTALLATION ".
  - Before replacing 4WAS front control unit, record the self-diagnosis results (history). Refer to "SPECIAL REPAIR REQUIREMENT ".