Adaptive Cruise Control (ACC) Symptom Troubleshooting Index(Adaptive Cruise Control (ACC))

NOTE: The ACC system is cancelled when the VSA system is activated.

Symptom	Diagnostic procedure	Also check for
Vehicle speed can be set, but there is no ACC indication on the MID	Do the gauge control module self-diagnostic function .
ACC OFF is displayed on the MID unexpectedly	Check the ACC system auto stop control history .
Vehicle speed cannot be set when the SET switch is pressed between 25 mph (40 km/h) and 90 mph (145 km/h)	Test the ACC combination switch . Test the brake pedal position switch .	An open in the wire. A short in the wire. The system is in service mode.
Vehicle does not decelerate or accelerate accordingly when the SET or RES switch is pressed	Test the ACC combination switch .	An open in the wire.
Set speed does not cancel when the brake pedal is pressed	Test the brake pedal position switch .	An open in the wire.
Set speed does not cancel when the MAIN switch is turned off	Test the ACC combination switch .	An open in the wire.
Set distance cannot be adjusted with the distance switch	Test the ACC combination switch .
Vehicle speed can be set, but vehicle decelerates	Check for DTCs in the PGM-FI system with the HDS .	Faulty ETCS.
ACC activation indicator (on the MID) does not come on	Symptom troubleshooting .
ACC activation indicator (on the MID) does not go off	Symptom troubleshooting .
ACC indicator (on the MID) does not come on	Symptom troubleshooting .
ACC indicator (on the MID) does not go off	Symptom troubleshooting .
Senses a vehicle driving in another lane	Symptom troubleshooting .	Incorrect millimeter wave radar installation. Wheel alignment.
Does not sense the vehicle driving ahead	Symptom troubleshooting .	Out of the performance limits. Wheel alignment. Undetectable environment.
Intermittently senses the vehicle driving ahead	Symptom troubleshooting .	Incorrect millimeter wave radar installation. Wheel alignment. Undetectable environment.