Inspection Procedure 3: The Cruise Control is Cancelled Although The Switch is not Operated During The ACC Operation.


COMMENTS ON TROUBLE SYMPTOM


A malfunction is detected while the adaptive cruise control system (ACC) is activated.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines.
  • Before replacing the ECU, ensure that the CAN bus lines is normal.

STEP 1. Check the CAN bus system diagnosis.
Using M.U.T.-III, perform CAN bus diagnosis (Refer to GROUP 54C - Explanation About The M.U.T-III Can Bus Diagnostics ).

Q. Is the check result satisfactory?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Can Bus Diagnostic Table ). Then go to Step 2.

STEP 2. Check the diagnosis code is stored again.

Q. Is diagnosis code stored?
Repair the adaptive cruise control system (ACC) (Refer to ).
Go to Step 3.

STEP 3. Check the other system diagnosis code.
Using M.U.T.-III, perform MPI system diagnosis code (Refer to , GROUP 13A - Troubleshooting, Diagnosis Function <4B1>, GROUP 13B - Troubleshooting, Diagnosis Function <6B3>) .

Q. Is any diagnosis code stored?
Repair the MPI system (Refer to , GROUP 13A - Troubleshooting, Inspection Chart for Diagnosis Code <4B1>, GROUP 13B - Troubleshooting, Inspection Chart for Diagnosis Code <6B3>) .
Go to Step 4.

STEP 4. Check the other system diagnosis code.
Using M.U.T.-III, perform ASC system diagnosis code (Refer to GROUP 35C - Troubleshooting, Diagnosis Function ).

Q. Is the diagnosis code stored?
Repair the ASC system (Refer to GROUP 35C - Troubleshooting, Inspection Chart for Diagnosis Code ).
Go to Step 5.

STEP 5. Check the other symptom.
The system should be turned on when the cruise control switch is operated.

Q. Is the system turned on by operating the cruise control switch?
Go to Step 6.
Refer to "When the cruise control switch is operated, the system is not turned on."(Refer to )

STEP 6. Check the cruise control switch.
Refer to .

Q. Is the check result normal?
Go to Step 7.
Replace the cruise control switch (Refer to ).

STEP 7. Check the symptom.
(1)Drive the vehicle for approx. three minutes.

Q. Is the cruise control cancelled?
Replace the ACC/FCM-ECU (Refer to ).
It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).