ABS

DTC U0100: Engine time-out error

DTC U0141: ETACS time-out error

CAUTION
^ If the diagnostic trouble codes U0100 and U0141 are set in ABS-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble code is not highly reliable.
^ Before replacing the ECU, ensure that the communication circuit is normal.

CIRCUIT OPERATION
ABS-ECU communicates with the engine ECU and ETACS-ECU via the CAN bus lines.

DTC SET CONDITIONS
This diagnostic trouble code is set if ABS-ECU cannot receive the signal sent from other ECU for a certain period.

PROBABLE CAUSES

DTC U0100
^ Wiring harness or connector failure of CAN bus line
^ Engine ECU malfunction
^ ABS-ECU malfunction

DTC U0141
^ Wiring harness or connector failure of CAN bus line
^ Malfunction of ETACS-ECU
^ ABS-ECU malfunction

DIAGNOSIS

Required Special Tools:
^ MB991958: Scan Tool (M.U.T-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. On completion, go to Step 4.

STEP 2. Check whether the diagnostic trouble code is reset.
Q: Is DTC U0100 or U0141 set?
YES: Go to Step 3.
NO: The procedure is complete.

STEP 3. M.U.T.-III other system diagnostic trouble code
Use scan tool to check that other diagnostic trouble code is set in the ECU corresponding to the relevant diagnosis.
Q: Is other DTC set?
YES: Troubleshoot for the relevant diagnostic trouble code.
NO: Go to Step 4.

STEP 4. M.U.T.-III diagnostic trouble code
Use scan tool to check that the diagnostic trouble code is set in ABS-ECU or other ECU.
Q: Is any DTC set?
YES (DTC U0100 is set in ABS-ECU and other ECU): Replace the engine ECU, and then go to Step 5.
YES (DTC U01 41 is set in ABS-ECU and other ECU): Replace the ETACS-ECU, and then go to Step 5.
NO (No DTC is set.): Go to Step 5.

STEP 5. Check whether the diagnostic trouble code is reset.
Q: Is DTC U0100 or U0141 set?
YES: Replace the ABS-ECU.
NO: The procedure is complete.