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.
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
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.
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 ).