DTC U0100: Engine CAN Timeout: Diagnosis

STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
1. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
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?
  
  YES: Go to Step 2.
  
  NO: Repair the CAN bus line (Refer to Troubleshooting - CAN BUS DIAGNOSTICS TABLE ).
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set.
Check if DTC U0141 set in TCU.

Q: Is the DTC set?

YES: Troubleshoot DTC U0141 (Refer to DTC U0141: ETACS CAN TIMEOUT ).

NO: Go to Step 3.
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the other system DTC is set.
Check whether an ECM "time-out" related DTC U0100 is set in other ECUs (Refer to CAN-RELATED DTC TABLE ).

Q: Is the DTC set?

YES: Go to Step 4.

NO: Go to Step 5.
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the TCU.
1. Erase the DTC.
2. Turn the ignition switch from OFF position to ON position.
3. Check the DTC.
  Q: Is the DTC set?
  
  YES: Replace the ECM.
  
  NO: A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the ECM and the TCU (Refer to How to use troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 5. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the TCU.
1. Erase the DTC.
2. Turn the ignition switch from OFF position to ON position.
3. Check the DTC.
  Q: Is the DTC set?
  
  YES: Replace the TCU (Refer to TCU ).
  
  NO: A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the ECM and the TCU (Refer to How to use troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).