Code No. U1100: Engine-related CAN Timeout error
Code No. U1104: Steering wheel sensor CAN Timeout error
Code No. U1105: G and yaw rate sensor time-out


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 U1100, U1104 and U1105 are set in TCL/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 TCL/ASC-ECU learn the neutral point (Refer to ).

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

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

PROBABLE CAUSES
Code No. U1100
  • Wiring harness or connector failure of CAN bus line
  • Engine-ECU or engine-A-M/T-ECU malfunction
  • TCL/ASC-ECU malfunction
Code No. U1104
  • Wiring harness or connector failure of CAN bus line
  • Steering wheel sensor malfunction
  • TCL/ASC-ECU malfunction
Code No. U1105
  • Wiring harness or connector failure of CAN bus line
  • G and yaw rate sensor malfunction
  • TCL/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. U1100, U1104 or U1105 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 on the CAN bus lines.

Q. Is any diagnosis code set?
YES (Code No. U1100 is set) : Replace the Engine-ECU or engine-A-M/T-ECU, and then go to Step 5.
YES (Code No. U1104 is set) : Replace steering wheel sensor, and then go to Step 5.
YES (Code No. U1105 is set) : Replace the G and yaw rate sensor, 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. U1100, U1104 or U1105 set?
Replace the hydraulic unit (integrated with TCL/ASC-ECU). (Refer to ).
The procedure is complete.