STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the ACC/FCM-ECU.(1) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(2) Press the ACC ON/OFF switch to turn the ACC system to ON.
(3) On completion, check that the DTC is set again.
Is DTC C1793 set?
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 ).