Code No. U1200 SAS parity error
Code No. U1204 SAS message counter error


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 is sent to ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS
If the steering wheel sensor determines that its incorporated yaw rate sensor has a trouble, it sends the diagnostic signal to the ASC-ECU. When ASC-ECU receives this diagnostic signal, it determines that the sensor has a trouble and sets the diagnosis code.

PROBABLE CAUSES

  • Malfunction of the steering wheel sensor
  • Malfunction of ASC-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
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 - CAN Bus Diagnostics Table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is the diagnosis code No.U1200, U1204 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.

Q. Is the diagnosis code No.U1200, U1204 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 4.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 4. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.

Q. Is the diagnosis code No.U1200, U1204 set?
Return to Step 1.
This diagnosis is complete.