Anti-Lock Braking System (ABS)

DTC U0100: Engine timeout error
DTC U0141: ETACS timeout 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 control module (ECM) 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 control module (ECM) 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. Using scan tool MB991958, diagnose the CAN bus line.

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 CAN Bus Diagnostics Chart).
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. Using scan tool MB991958, check the 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. Using scan tool MB991958, check the DTC

Use scan tool MB991958 to check if the same DTC (timeout) is set in the other ECU (CAN-C).

Q. Is any DTC set?

YES (DTC U0100 is set) : Replace the engine control module (ECM), 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.

Erase the DTC.

Q. Is DTC U0100 or U0141 set?

YES Replace the hydraulic unit (integrated with ABS-ECU) (Refer to Anti-Lock Braking System (ABS)).
NO The procedure is complete.