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DTC U0428: SAS (CAN message)


caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • Whenever the steering wheel sensor is replaced, always calibrate the sensor (Refer to GROUP 35C - Steering wheel calibration ). Then make the steering wheel sensor learn the compensation which the PHEV-ECU has stored (Item: Initialization, Item No. 3: Steering Angle offset reset ).

DTC SET CONDITIONS
The PHEV-ECU sets DTC U0428 when the steering wheel sensor signal fails.

PROBABLE CAUSES

  • Malfunction of CAN bus line
  • Malfunction of the steering wheel sensor
  • Malfunction of the PHEV-ECU

DIAGNOSIS

STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
Diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).

STEP 2. Using scan tool (M.U.T.-IIISE), check the data list.
Check whether the PHEV-ECU related data list is set or not (Refer to ).

  • Item No.333: Steering angle

Q. Is the check result normal?
Go to Step 3.
Replace the steering wheel sensor (Refer to GROUP 35C - Steering Wheel Sensor ).

STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.

Q. Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).