Code No. U0428 Communication error in steering wheel sensor


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, CAN Bus Diagnosis Table ).
  • If diagnosis code U0428 is 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 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 ).

OPERATION
The steering wheel sensor outputs the steering wheel status to ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASC-ECU has detected the communication error in the steering wheel sensor.

PROBABLE CAUSES

  • Steering wheel sensor malfunction
  • ASC-ECU malfunction
  • External noise interference

DIAGNOSIS PROCEDURE

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

Q. Is the check result normal?
Replace the steering wheel sensor (Refer to ). Then go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 3.

STEP 2. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.U0428 set?
Replace the hydraulic unit (ASC-ECU) (Refer to ).
This diagnosis is complete.

STEP 3. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.U0428 set?
Return to Step 1.
This diagnosis is complete.