DTC C1776: Received ACC Failure from Engine Control Module: Diagnosis

STEP 1. Diagnose the CAN bus line.
CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. (Refer to PRECAUTIONS ON HOW TO REPAIR THE TERMINATOR RESISTOR )
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?

YES: Go to Step 2.

NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ).
STEP 2. Scan tool (M.U.T.-III) other system diagnostic trouble code.
Check the engine diagnostic trouble code (Refer to DIAGNOSTIC TROUBLE CODE CHART <2.4L ENGINE>, 13B - Diagnosis, DIAGNOSTIC TROUBLE CODE CHART <3.0L ENGINE>).

Q: Is the diagnostic trouble code set?

YES: Perform the relevant troubleshooting.

NO: Go to Step 3.
STEP 3. Check whether the diagnostic trouble code is set again.
Q: Is diagnostic trouble code No.C1776 set?

YES: Replace the ACC-ECU (Refer to ACC-ECU ).

NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).