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DTC U0428: Communication error in steering wheel sensor
 
 
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 (Refer to GROUP 54C - CAN Bus Line Diagnostic Flow ).
  • If diagnostic trouble 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 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 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 ).
 
 
CIRCUIT OPERATION
The steering wheel sensor outputs the steering wheel status to ASC-ECU via the CAN bus lines.
 
 
 
DTC SET CONDITIONS
This diagnostic trouble 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
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
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 - CAN Bus Diagnostics Table ). On completion, go to Step 3.
 
STEP 2. Check whether the DTC is reset.
Erase the DTC.
Is DTC U0428 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
The procedure is complete.
 
STEP 3. Check whether the DTC is reset.
Erase the DTC.
Is DTC U0428 set?
Return to Step 1.
The procedure is complete.