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 - Troubleshooting ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the steering wheel sensor is replaced, always carry out calibration to make ASTC-ECU learn the neutral point (Refer to ).
  • When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to ).

OPERATION


The steering wheel sensor outputs the steering wheel status to ASTC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS


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

PROBABLE CAUSES


Current trouble
Past trouble

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 lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines


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?

Follow the relevant diagnosis code procedure, and then go to Step 5.
Go to Step 4.

STEP 4. Diagnosis code recheck


Check again if the diagnosis code is set.
(1)Erase the set diagnosis code.
(2)Ignition switch: "LOCK" (OFF)
(3)Ignition switch: "ON"

Q. Is diagnosis code No. U0428 set?

Replace the column switch assembly (Integrated with steering wheel sensor) (Refer to GROUP 54A - Column Switch ). Then go to Step 5.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 5. Diagnosis code recheck


Check again if the diagnosis code is set.
(1)Erase the set diagnosis code.
(2)Ignition switch: "LOCK" (OFF)
(3)Ignition switch: "ON"

Q. Is diagnosis code No. U0428 set?

Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).





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