DTC U0121: CAN time-out error (ABS/ASC): Diagnosis
- STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics
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Use scan tool (M.U.T.-IIISE) 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 CAN BUS DIAGNOSTICS TABLE ).
- STEP 2. Scan tool (M.U.T.-IIISE) diagnostic trouble code
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Check if the ASC-related diagnostic trouble code is set.
Q: Is the ASC-related diagnostic trouble code set?
YES : Carry out the appropriate troubleshooting.
NO : Go to Step 3.
- STEP 3. Scan tool (M.U.T.-IIISE) diagnostic trouble code
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Is diagnostic trouble code No. U0121 set in the other ECU, which communicates with the ASC-ECU via CAN?
Q: Is the diagnostic trouble code set?
YES : Go to Step 4.
NO : Go to Step 5.
- STEP 4. Symptom recheck after erasing diagnostic trouble code
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Q: Is the diagnostic trouble code set?
YES : Replace the ASC-ECU.
NO : Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
- STEP 5. Symptom recheck after erasing diagnostic trouble code
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Q: Is the diagnostic trouble code set?
YES : Replace the TCM.
NO : Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).