Active Center Differential (ACD)

DTC U1415: Coding incomplete/fail

CAUTION
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble 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.
^ When the diagnostic trouble code No.U1415 is set in AWC-ECU, the diagnostic trouble code may also be set in ETACS-ECU. When the diagnostic trouble code is set in ETACS-ECU, perform the diagnosis of the diagnostic trouble code for ETACS-ECU first.

OPERATION
AWC-ECU receives the vehicle information stored in ETACS-ECU via CAN bus lines.

DTC SET CONDITIONS
The diagnostic trouble code is set when the AWC-ECU coding has not been performed.

PROBABLE CAUSES
^ Variant coding for ETACS-ECU has not been implemented.
^ Malfunction of AWC-ECU

DIAGNOSIS

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. (Refer to Troubleshooting CAN Bus Diagnostics Table).

STEP 2. Scan tool diagnostic trouble code
Check the ETACS diagnostic trouble code. (Refer to Troubleshooting Diagnostic Trouble Code Descriptions).
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 3.

STEP 3. ETACS-ECU coding data check
Using the scan tool, check if there is any abnormality to the coding data stored in the ETACS-ECU. (Refer to Coding Reference Table How to Perform Vehicle Identification Number (VIN) Writing).
Q: Is the check result normal?
YES: Go to Step 4.
NO: Replace the ETACS-ECU. Then go to Step 5.

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U1415 set?
YES: Replace the AWC-ECU. Then go to Step 5.
NO: Intermittent malfunction. (Refer to How to Cope with Intermittent Malfunction How to Use Troubleshooting/Inspection Service Points).

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U1415 set?
YES: Return to Step 1.
NO: This diagnosis is complete.