S-AWC

DTC U0100: Engine Time-out Error

CAUTION
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
^ Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION
AWC-ECU communicates with the engine control module via the CAN bus lines.

DTC SET CONDITIONS
The code is set when the signal sent from the engine ECU cannot be received for a certain period.

PROBABLE CAUSES
^ The CAN bus line is defective.
^ Malfunction of engine control module
^ Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. Diagnostic Trouble Code Descriptions
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 3.

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. U0100 set?
YES: Replace the AWC-ECU. Then go to Step 4.
NO: Intermittent malfunction.

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U0100 set?
YES: Return to Step 1.
NO: This diagnosis is complete.