ABS

DTC U0100: Engine time-out error

DTC U0141: ETACS time-out error

CAUTION
^ If the DTCs 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 DTC may be set. In this case, the set DTC 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 DTC 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 DTC 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 DTC
Use scan tool to check that other DTC is set in the ECU corresponding to the relevant diagnosis.

Q: Is other DTC set?
YES: Troubleshoot for the relevant DTC.
NO: Go to Step 4.

STEP 4. M.U.T.-III DTC
Use M.U.T.-III to check if the same DTC (time-out) is set in the other ECU (CAN-C).

Q: Is any DTC set?
YES (DTC U0100 is set): Replace the engine ECU, and then go to Step 5.
YES (DTC U0141 is set): Replace the ETACS-ECU, and then go to Step 5.
NO (No DTC is set.): Go to Step 5.

STEP 5. Check whether the DTC is reset.

Q: Is DTC U0100 or U0141 set?
YES: Replace the ABS-ECU.
NO: The procedure is complete.