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DTC U0428: SAS (CAN message)
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code (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.
 
 
OPERATION
The steering wheel sensor outputs the steering wheel status to EPS-ECU via the CAN bus lines.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITIONS
This diagnostic trouble code is set when EPS-ECU has detected the communication error in the steering wheel sensor.
 
 
PROBABLE CAUSES
  • Malfunction of the steering wheel sensor
  • Malfunction of the EPS-ECU
  • Noise interference
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
Use scan tool (M.U.T.-III) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. DTC recheck after resetting CAN bus lines.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is set.
Is DTC U0428 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Use scan tool (M.U.T.-III) to check the other diagnostic trouble code(s) is set.
Check if diagnostic trouble code(s) other than DTC U0428 is set.
Is the diagnostic trouble code set?
Follow the relevant diagnostic trouble code procedure (Refer to ), and then go to Step 6.
Go to Step 4.
 
STEP 4. Use scan tool (M.U.T.-III) to check the diagnostic trouble code of other systems.
Check if DTC U0428 is set in the ASC-ECU.
Is DTC U0428 set?
Replace the steering wheel sensor (Refer to GROUP 35C - Steering Wheel Sensor ). Then go to Step 6.
Go to Step 5.
 
STEP 5. Check whether the diagnostic trouble code is set again.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is set.
Is DTC U0428 set?
Replace the EPS-ECU (Refer to ). Then go to Step 6.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions ).
 
STEP 6. Check whether the diagnostic trouble code is set again.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is set.
Is DTC U0428 set?
Return to Step 1.
This diagnosis is complete.