Code No. C1776: ACC System Fail Detected (ENG)

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 ).
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
When the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).

OPERATION

The ACC/FCM-ECU receives system fault information from the engine-ECU.

DIAGNOSIS CODE SET CONDITION

The ACC/FCM-ECU sets the diagnosis code when it receives system fault information from the engine-ECU.

PROBABLE CAUSES

Malfunction of the CAN bus line
Malfunction of the engine-ECU
Malfunction of the ACC/FCM-ECU

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. Use M.U.T.-III to confirm a diagnosis code of other systems.

Check if the diagnosis code is set in the engine-ECU (Refer to GROUP 13B - Troubleshooting, Diagnosis Function) <6B3> or (Refer to GROUP 13C - Troubleshooting, Diagnosis Function) <4N1>.

Q. Is the diagnosis code set?

	Troubleshoot the engine-ECU diagnosis code (Refer to GROUP 13B - Troubleshooting, Inspection Chart for Diagnosis Code) <6B3> or (Refer to GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Code) <4N1>.

	Go to Step 3.

STEP 3. Check whether the diagnosis code is set again.

Check again if the diagnosis code is set in the ACC/FCM-ECU.

(1)Erase the diagnosis code.

(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.

(3)Start the engine.

(4)Press the ACC ON/OFF switch to turn the ACC system to ON.

(5)On completion, check that the diagnosis code is set again.

Q. Is diagnosis code No. C1776 set?

	Replace the ACC/FCM-ECU (Refer to ).

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction).