Electronic Control AWD

DTC U1415 Variant coding not implemented

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 CAN Bus Diagnostics Chart).

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

- When the DTC U1415 is set in AWD-ECU, the diagnostic trouble code may also be set in ETACS-ECU. When the diagnostic trouble code is set in ETACS-ECU, carry out the diagnosis of the diagnostic trouble code for ETACS-ECU first.

OPERATION

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

DIAGNOSTIC TROUBLE CODE SET CONDITIONS

This diagnostic trouble code is set when the variant coding for ETACS-ECU has not been implemented.

PROBABLE CAUSES

Current trouble

- AWD-ECU malfunction

- Variant coding for ETACS-ECU has not been implemented.

- Wiring harness or connector failure in the CAN bus lines between ETACS-ECU and AWD-ECU
Past trouble

AWD-ECU DTC U1415 has not been erased.

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.

- MB991827: USB Cable

- MB991910: Main Harness A

STEP 1. Scan tool MB991958 CAN bus diagnostics

Use scan tool MB991958 to diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus line CAN Bus Diagnostics Chart). Then go to Step 4.
STEP 2. Scan tool MB991958 DTC of other systems

Use M.U.T.-III to check that the DTC B222C is set in the ETACS-ECU.

Q. Is the DTC set?

YES Troubleshoot the relevant diagnostic trouble code, and then go to Step 4.
NO Go to Step 3.
STEP 3. Check whether the DTC is reset.

(1)Erase the DTC.

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

(3)Check if the DTC is set.

Q. Is the DTC U1415 set?

YES Replace AWD-ECU (Refer to Electronic Control AWD). Then go to Step 4 .
NO The trouble can be an intermittent malfunction such as loose connector fit, wiring harness open circuit How to Cope With Intermittent Malfunctions).
STEP 4. Check whether the DTC is reset.

Q. Is the DTC U1415 set?

YES Diagnose again from Step 1.
NO This procedure is complete.