U1425

DTC U1425: TC-SST Data Error

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.

OPERATION

AWC-ECU communicates with TC-SST-ECU via the CAN bus lines.

DTC SET CONDITIONS

The code is set when abnormality is detected in the signal received from the TC-SST-ECU.

PROBABLE CAUSES

- The CAN bus line is defective.
- Malfunction of TC-SST-ECU
- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

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. CAN Bus Diagnostics Chart.)
STEP 2. Scan tool diagnostic trouble code

Check the TC-SST diagnostic trouble code. Twin Clutch-Sportronic Shift Transmission (TC-SST).)

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 3.
STEP 3. Scan tool service data

Item No. 17: T/M shift range (Refer to Data List Reference Table.)

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
NO Go to Step 4.
STEP 4. Check whether the DTC is reset.

Q. Is DTC No. U1425 set?

YES Replace the AWC-ECU.(Refer to Active Center Differential (ACD).) Then go to Step 5.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
STEP 5. Check whether the DTC is reset.

Q. Is DTC No. U1425 set?

YES Return to Step 1.
NO This diagnosis is complete.