Continuously Variable Transmission/Transaxle, CVT

DTC U0121: CAN Time-out Error (ABS)

DIAGNOSTIC FUNCTION

TCM determines that malfunction is present if the periodic communication data sent from the ABS-ECU via CAN bus lines is abnormal.

JUDGEMENT CRITERIA

TCM cannot receive the periodic communication data from ABS-ECU.

PROBABLE CAUSES

- Malfunction of the CAN bus

- ABS-ECU malfunction

- Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines CAN Bus Diagnostics Chart).
STEP 2. M.U.T.-III diagnosis code

Check if the ABS-related diagnosis code is set.

Q. Is the ABS-related diagnosis code set?

YES Carry out the appropriate troubleshooting.
NO Go to Step 3.
STEP 3. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?

YES Intermittent malfunction
NO Replace TCM.