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

WARNING: This page is about a different variant/trim than selected.

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

CAUTION:

If the TCM is stored the DTC U0100, make sure to diagnose the CAN bus line.
If there is any problem in the CAN bus lines, an incorrect DTC may be stored. Prior to this diagnosis, diagnose the CAN bus lines.
Before replacing the ECU, ensure that the CAN bus line is normal.

STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
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).

Using scan tool (M.U.T.-III), perform CAN bus diagnosis (Refer to EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS ).

Q: Is the check result normal?

YES: Go to Step 3.

NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTIC TABLE ). Then go to Step 2.
STEP 2. Using scan tool (M.U.T.-III), DTC recheck after repairing CAN bus lines.
Check again if the DTC is stored.
1. Erase the DTC.
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Carry out a test drive with the OBD-II drive cycle pattern.
4. Recheck the DTC.
Q: Is DTC U0100 stored?

YES: Go to Step 3.

NO: This diagnosis is complete.
STEP 3. Using scan tool (M.U.T.-III), check the DTC of other system.
Using scan tool (M.U.T.-III), check if the DTC is stored in ECM (Refer to DIAGNOSTIC FUNCTION ).

Q: Is any DTC stored?

YES: Perform the MFI system diagnosis (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step 4.

NO: Go to Step 4.
STEP 4. Using scan tool (M.U.T.-III), check the DTC of other system.
Using scan tool (M.U.T.-III), check whether an engine "time-out" related DTC is stored in other ECU (ASC-ECU, ETACS-ECU, combination meter, etc.).

Q: Is any DTC stored?

YES: Replace ECM (Refer to ENGINE CONTROL MODULE (ECM) ). Then go to Step 6.

NO: Go to Step 5.
STEP 5. Using scan tool (M.U.T.-III), recheck the DTC.
Check again if the DTC is stored.
1. Erase the DTC.
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Carry out a test drive with the OBD-II drive cycle pattern.
4. Recheck the DTC.
Q: Is DTC U0100 stored?

YES: Replace the TCM (Refer to TRANSAXLE CONTROL MODULE (TCM) ) Then go to Step 6.

NO: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
STEP 6. Using scan tool (M.U.T.-III), recheck the DTC.
Check again if the DTC is stored.
1. Erase the DTC.
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Carry out a test drive with the OBD-II drive cycle pattern.
4. Recheck the DTC.
Q: Is DTC U0100 stored?

YES: Return to Step 1.

NO: This diagnosis is complete.