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Inspection Procedure 6: The Adaptive Cruise Control is Cancelled Although The Switch is not Operated During The ACC Operation.
 
 
cautionWhen the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).
 
 
COMMENTS ON TROUBLE SYMPTOM
  • The conditions for cancelling the adaptive cruise control (ACC) system may be satisfied.
  • The fail-safe function is probably cancelling ACC system. In this case, checking the DFI and MFI system, ASC system and electric parking brake system DTC.
 
 
PROBABLE CAUSES
  • Malfunction of the cruise control switch
  • Malfunction of the stoplight switch
  • Malfunction of the ACC/FCM-ECU
  • Malfunction of the DFI and MFI system
  • Malfunction of the ASC system
  • Malfunction of the electric parking brake system
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check the DFI and MFI system data list.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "ON" position.
(3) Using scan tool (M.U.T.-IIISE), check the DFI and MFI system data list (Refer to GROUP 13A - Diagnosis, Data List Reference Table ).
  • Item No.74: Stoplight switch
  • Item No.89: Normally closed brake switch
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2.
Check stoplight switch system. Check DTC P0504: Malfunction of the Stoplight Switch System (Refer to ).
 
STEP 2. Check the cruise control switch.
Refer to .
Is the check result normal?
Go to Step 3.
Replace the cruise control switch (Refer to ).
 
STEP 3. Check the symptom.
Confirm whether a trouble symptom reappears when the ACC cancellation conditions are not satisfied (For details, refer to the relevant Technical Information Manual - GROUP 17 - Adaptive Cruise Control System).
Is the adaptive 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 ).