S-AWC

DTC U0428: Steering Wheel Sensor Data Error

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.
^ Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
^ When the steering wheel sensor is replaced, calibrate the steering wheel sensor, and initialize the steering angle correction amount stored in AWC-ECU. (Item No.1: Steering angle correction amount initialization Special Function Reference Table)

OPERATION
AWC-ECU communicates with the steering wheel sensor via the CAN bus lines.

DTC SET CONDITIONS
The code is set when abnormality is detected in the signal received from the steering wheel sensor.

PROBABLE CAUSES
^ The CAN bus line is defective.
^ Malfunction of steering wheel sensor
^ Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines.

STEP 2. Scan tool service data
Item No. 11: Steering wheel sensor (Data List Reference Table)
Q: Is the check result normal?
YES: Intermittent malfunction.
NO: Replace the steering wheel sensor. Then go to Step 3.

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. U0428 set?
YES: Replace the AWC-ECU. Then go to Step 4.
NO: Intermittent malfunction.

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U0428 set?
YES: Return to Step 1.
NO: This diagnosis is complete.