Code No. U0100 Engine time-out error
Code No. U0101 CVT or A/T or TC-SST time-out error
Code No. U0126 Steering wheel sensor time-out error
Code No. U0141 ETACS time-out error
Code No. U0136 AWC time-out error


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
  • If diagnosis codes U0100, U0101, U0126, U0141, and U0136 are set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set diagnosis 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 (Refer to ).
  • 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 (Refer to , and ).

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ASC-ECU cannot receive the signal sent from other ECU for a certain period.

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

PROBABLE CAUSES
Code No. U0100
  • Wiring harness or connector failure of CAN bus line
  • Engine ECU malfunction
  • ASC-ECU malfunction
Code No. U0101
  • Wiring harness or connector failure of CAN bus line
  • CVT or A/T or TC-SST-ECU malfunction
  • ASC-ECU malfunction
Code No. U0126
  • Wiring harness or connector failure of CAN bus line
  • Steering wheel sensor malfunction
  • ASC-ECU malfunction
Code No. U0141
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of ETACS-ECU
  • ASC-ECU malfunction
Code No. U0136
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of AWC-ECU
  • ASC-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ). On completion, go to Step 4.

STEP 2. Check whether the diagnosis code is reset.

Q. Is Code No. U0100, U0101, U0126, U0141 or U0136 set?
Go to Step 3.
The procedure is complete.

STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that other diagnosis code is set in the ECU corresponding to the relevant diagnosis.

Q. Is other diagnosis code set?
Troubleshoot for the relevant diagnosis code.
Go to Step 4.

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

Q. Is any diagnosis code set?
YES (Code No. U0100 is set) : Replace the engine ECU, and then go to Step 5.
YES (Code No. U0101 is set) : Replace the CVT or A/T or TC-SST-ECU, and then go to Step 5.
YES (Code No. U0126 is set) : Replace steering wheel sensor, and then go to Step 5.
YES (Code No. U0141 is set) : Replace the ETACS-ECU, and then go to Step 5.
YES (Code No. U0136 is set) : Replace the AWC-ECU, and then go to Step 5.
NO (No diagnosis code is set.) : The procedure is complete.

STEP 5. Check whether the diagnosis code is reset.

Q. Is Code No. U0100, U0101, U0126, U0141 or U0136 set?
Replace the hydraulic unit (ASC-ECU) (Refer to ).
The procedure is complete.