Code No. U0428: SAS (CAN Message)


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code 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.

DIAGNOSIS CODE SET CONDITIONS


This diagnosis code is set when EPS-ECU has detected the communication error in the steering wheel sensor.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis.
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is diagnosis code No. U0428 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Check for diagnosis codes of other systems.
Check if diagnosis code(s) other than U0428 is set.

Q. Is the diagnosis code set?
Perform troubleshooting for the relevant diagnosis code. (Refer to ). Then go to Step 6.
Go to Step 4.

STEP 4. Use M.U.T.-III to confirm a diagnosis code of other systems.
Check if diagnosis code No. U0428 is set to the ASC-ECU.

Q. Is the diagnosis code 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 diagnosis code is set again.
Check again if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is diagnosis code No. U0428 set?
Replace the EPS-ECU. Then go to Step 6.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction).

STEP 6. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3)Check if the diagnosis code is set.

Q. Is diagnosis code No. U0428 set?
Return to Step 1.
This diagnosis is complete.