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 (Refer to Troubleshooting, Diagnosis Code Chart). 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.