Code No. C123A Abnormality in sensor calibration


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, Trouble code diagnosis ).

OPERATION
ASC-ECU stores the calibrated value of the G and yaw rate sensor, steering wheel sensor, and brake fluid pressure sensor.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the calibrated value for each sensor stored in ASC-ECU is not within the predetermined range.

  • Abnormality in neutral position of the G and yaw rate sensor
  • Abnormality in neutral position of the steering wheel sensor

PROBABLE CAUSES

  • ASC-ECU malfunction
  • External noise interference
  • Accidental shutdown of power supply during the storing operation of calibrated value

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use 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 the diagnosis code No. C123A set?
Go to Step 3.
This diagnosis is complete.

STEP 3. G and yaw rate sensor calibration
Perform calibration of G and yaw rate sensor (Refer to ).

Q. Has the calibration succeeded?
Go to Step 4.
Replace the ASC-ECU.

STEP 4. Steering wheel sensor calibration
Perform calibration of steering wheel sensor (Refer to ).

Q. Has the calibration succeeded?
Go to Step 5.
Replace the ASC-ECU.

STEP 5. Check whether the diagnosis code is reset.

Q. Is the diagnosis code No. C123A set?
Replace the ASC-ECU.
This diagnosis is complete.