U0428
DTC U0428: Communication error in steering wheel sensorCAUTION:
^ If the 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.
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
Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. On completion, go to Step 3.
STEP 2. Check whether the diagnostic trouble code is reset.
Q: Is DTC U0428 set?
YES: Replace the steering wheel sensor, and then go to Step 3.
NO: The procedure is complete.
STEP 3. Check whether the diagnostic trouble code is reset.
Q: Is DTC U0428 set?
YES: Replace the ASC-ECU, and then go to Step 4.
NO: The procedure is complete.
STEP 4. Check whether the diagnostic trouble code is reset.
Q: Is DTC U0428 set?
YES: Return to Step 1.
NO: The procedure is complete.