DTC U0100: Engine CAN timeout: Diagnosis

STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line
CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
1. YES: Go to Step 2.
2. NO: Repair the CAN bus line (Refer to DIAGNOSIS ).
STEP 2. Using scan tool (M.U.T.-III), read the ECM diagnostic trouble code
Check if DTC is stored in the ECM.

Q: Is the DTC stored?
1. YES: Troubleshoot the engine (Refer to DTC CHART < 2.4 L ENGINE >, DTC CHART < 3.0 L ENGINE >)
2. NO: Go to Step 3
STEP 3. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
Check if the DTC No. U0100 stored in ETACS-ECU.

Q: Is the DTC stored?
1. YES: Go to Step 4
2. NO: Go to Step 5
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the combination meter.
1. Erase the DTC.
2. Turn the ignition switch from the LOCK (OFF) position to the ON position.
3. Check if the DTC is stored.
Q: Is the DTC stored?
1. YES: Replace the ECM.
2. NO: A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the ECM. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the combination meter.
1. Erase the DTC.
2. Turn the ignition switch from the LOCK (OFF) position to the ON position.
3. Check if the DTC is stored.
Q: Is the DTC stored?
1. YES: Replace the combination meter.
2. NO: A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the ECM. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)