Code No. U0121: CAN Time-out Error (ABS/ASC)


DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA



PROBABLE CAUSES



  • Malfunction of the CAN bus
  • ABS/ASC-ECU malfunction
  • Malfunction of CVT-ECU

DIAGNOSIS 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?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Diagnosis Code Chart ).

STEP 2. M.U.T.-III diagnosis code
Check if the ABS/ASC-related diagnosis code is set.

Q. Is the ABS/ASC-related diagnosis code set?
Carry out the appropriate troubleshooting.
Go to Step 3.

STEP 3. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?
Intermittent malfunction
Replace CVT-ECU.