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.

STEP 2. Scan tool diagnostic trouble code
Check the TC-SST diagnostic trouble code. (Diagnostic Trouble Code Descriptions)
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 (Data List Reference Table)
Q: Is the check result normal?
YES: Intermittent malfunction.
NO: Go to Step 4.

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U1425 set?
YES: Replace the AWC-ECU. Then go to Step 5.
NO: Intermittent malfunction.

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U1425 set?
YES: Return to Step 1.
NO: This diagnosis is complete.