Code No. C1776: Received ACC Failure from Engine-ECU


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.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION



DIAGNOSIS CODE SET CONDITION




  • A signal, which indicates a defective engine control system, is received from the engine-ECU.

PROBABLE CAUSES



  • Malfunction of the CAN bus line
  • Malfunction of engine-ECU
  • Malfunction of 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 ).

STEP 2. M.U.T.-III other system diagnosis code.
Check the engine diagnosis code (Refer to GROUP 13C -Troubleshooting <4J1>, 13D -Troubleshooting <4N1>).

Q. Is the diagnosis code set?
Perform the relevant troubleshooting.
Go to Step 3

STEP 3. Check whether the diagnosis code is reset.

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 ).