DTC U0100: CAN Time-Out Error (Engine): Diagnosis

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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 DIAGNOSTIC TROUBLE CODE CHART ).
STEP 2. M.U.T.-III diagnostic trouble code
Check if the engine-related diagnostic trouble code is stored.

Q: Is the engine-related diagnostic trouble code stored?
- YES: Carry out the appropriate troubleshooting.
- NO: Go to Step 3.
STEP 3. M.U.T.-III diagnostic trouble code
Is diagnostic trouble code No. U0100 stored in the other ECU, which communicates with the engine control module via CAN?

Q: Is the diagnostic trouble code stored?
- YES: Go to Step 4.
- NO: Go to 5.
STEP 4. Symptom recheck after erasing diagnostic trouble code
Q: Is the diagnostic trouble code stored?
- YES: Replace engine control module.
- NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .).
STEP 5. Symptom recheck after erasing diagnostic trouble code
Q: Is the diagnostic trouble code stored?
- YES: Replace TCM.
- NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .).