ASC

DTC U0100: Engine time-out error

DTC U0101: A/T or CVT time-out error

DTC U0114: AWD time-out error

DTC U0126: Steering wheel sensor time-out error

DTC U0141: ETACS 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.
^ If diagnostic trouble codes U0100, U0101, U0114, U0126, and U0141 are set in ASC-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.
^ When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point.
^ When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor.

CIRCUIT OPERATION
ASC-ECU communicates with the engine ECU, A/T or CVT-ECU, AWD-ECU, the steering wheel sensor, and ETACS-ECU via the CAN bus lines.

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

PROBABLE CAUSES

DTC U0100
^ Wring harness or connector failure of CAN bus line
^ Engine ECU malfunction
^ ASC-ECU malfunction

DTC U0101
^ Wring harness or connector failure of CAN bus line
^ Malfunction of A/T or CVT-ECU
^ ASC-ECU malfunction

DTC U0114
^ Wring harness or connector failure of CAN bus line
^ AWD-ECU malfunction
^ ASC-ECU malfunction

DTC U0126
^ Wring harness or connector failure of CAN bus line
^ Steering wheel sensor malfunction
^ ASC-ECU malfunction

DTC U0141
^ Wring harness or connector failure of CAN bus line
^ Malfunction of ETACS-ECU
^ ASC-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

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, U0101, U0114, U0126 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 ASC-ECU.
Q: Is any DTC set?
YES (DTC U0100 is set): Replace the engine ECU, and then go to Step 5.
YES (DTC U0101 is set): Replace the A/T or CVT-ECU, and then go to Step 5.
YES (DTC U0114 is set): Replace AWD-ECU, and then go to Step 5.
YES (DTC U0123 is set): Replace the steering wheel sensor, 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.): The procedure is complete.

STEP 5. Check whether the diagnostic trouble code is reset.
Q: Is DTC U0100, U0101, U0114, U0126, or U0141 set?
YES: Replace the ASC-ECU.
NO: The procedure is complete.