Detailed Flow

INTERVIEW FROM THE CUSTOMER
It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and understand them fully. Ask customer about his/her complaints carefully. In some cases, it will be necessary to check symptoms by driving vehicle with customer.

CAUTION: Customers are not professional. It is dangerous to make an easy guess like "maybe the customer means that...," or "maybe the customer mentions this symptom".

GO TO 2.
CHECK SYMPTOM
Start the engine.

CAUTION: Stop the vehicle.

Does 4WAS warning lamp turn ON?

YES: GO TO 3.

NO: GO TO 6.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III

Perform 4WAS main control unit self-diagnosis.

Is any DTC detected other than "C1930" or "C1931"?

YES: GO TO 4.

NO: GO TO 5.
PERFORM TROUBLE DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
1. Check the error system detected from the self-diagnosis.
  CAUTION: Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function.
2. Erase 4WAS main control unit self-diagnosis memory.
  CAUTION:
  - Never erase the self-diagnosis result (record) history when replacing 4WAS main control unit.
  - Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR" when erasing the memory of the self-diagnosis results (record).
GO TO 5.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT AND 4WAS MAIN CONTROL UNIT)
With CONSULT-III
1. Perform 4WAS front control unit self-diagnosis.
2. Check the error system detected from the self-diagnosis.
  CAUTION: Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function.
3. Erase 4WAS front control unit self-diagnosis memory.
  CAUTION:
  - Never erase the self-diagnosis result (record) history when replacing 4WAS front control unit.
  - Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR" when erasing the memory of the self-diagnosis results (record).
4. Perform 4WAS main control unit self-diagnosis.
5. Check the error system detected from the self-diagnosis.
  CAUTION: Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function.
6. Erase 4WAS main control unit self-diagnosis memory.
  CAUTION:
  - Never erase the self-diagnosis result (record) history when replacing 4WAS main control unit.
  - Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR" when erasing the memory of the self-diagnosis results (record).
GO TO 6.
CHECK TERMINAL
Check each harness connector pin terminal for disconnection.

GO TO 7.
CHECK SYMPTOM REPRODUCTION
With CONSULT-III

Perform DTC reproduction procedure for the error system.

Is any error system detected?

YES: GO TO 2.

NO: GO TO 8.
PERFORM SYMPTOM DIAGNOSIS
With CONSULT-III

Perform the symptom diagnosis for each system.

Is any error detected?

YES: GO TO 2.

NO: GO TO 9.
FINAL CHECK
With CONSULT-III

Check input/output signal standard of 4WAS front control unit and 4WAS main control unit.

Is the input/output the standard value?

YES: INSPECTION END

NO: GO TO 2.