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Diagnosis Procedure

CHECK 4WAS FRONT CONTROL UNIT (1)
With CONSULT-III
1. Start the engine.
  CAUTION: Stop the vehicle.
2. Check "THERM TEMP" on "DATA MONITOR" of 4WAS front control unit.
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" of 4WAS front control unit.
Is DATA MONITOR value difference between before and after the service 3° or less?

YES: Replace 4WAS front control unit. Refer to "EXPLODED VIEW ".

NO: GO TO 2.

CHECK 4WAS FRONT CONTROL UNIT (2)

With CONSULT-III

Start the engine.
CAUTION: Stop the vehicle.
Check "THERM TEMP" item on "DATA MONITOR" of 4WAS front control unit.
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" of 4WAS front control unit.

MONITOR ITEM CONDITION CHART

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 "EXPLODED VIEW ".

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 "EXPLODED VIEW ".