Diagnosis Procedure

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.

With CONSULT 

1. Start the engine.
   CAUTION: Never drive the vehicle.
2. Check "THERM TEMP" item 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" 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 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 ".