Inspection Procedure 3: The FCM System is Cancelled in Conjunction with a Warning Message while the FCM System is Activated.


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
  • Before replacing the ECU, ensure that the communication circuit is normal.
  • When the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).

COMMENTS ON TROUBLE SYMPTOMS



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. M.U.T.-III Diagnosis code.
Use M.U.T.-III to check that the diagnosis code is set by the ACC/FCM-ECU.

Q. Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code (Refer to ).
Go to Step 3.

STEP 3. M.U.T.-III diagnosis code.
Use M.U.T.-III to check that the diagnosis code is set by the ASTC-ECU.

Q. Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code (Refer to ).
Go to Step 4.

STEP 4. Retest the system.
Check that the FCM system control operates normally.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
Replace the ACC/FCM-ECU (Refer to ).