Code No. C123C Abnormality in G and yaw rate sensor


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 supplies power to the G and yaw rate sensor at the terminal No. 1.
  • The G and yaw rate sensor outputs the signal to ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is found:

  • The output value of G and yaw rate sensor is abnormal.
  • When abnormality is detected by comparing the value output from the G and yaw rate sensor with the one from the steering wheel sensor and wheel speed sensor

PROBABLE CAUSES

  • Improper installation of the G and yaw rate sensor
  • G and yaw rate sensor malfunction
  • Steering wheel sensor malfunction
  • Malfunction of wheel speed sensor
  • ASC-ECU malfunction
  • External noise interference

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. C123C set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Check the wheel speed sensor-related diagnosis code.
Use M.U.T.-III to check whether the wheel speed sensor-related or steering wheel sensor-related diagnosis code is set or not.

Q. Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code (Refer to ).
Go to Step 4.

STEP 4. G and yaw rate sensor installation check
Check that the G and yaw rate sensor is installed correctly.

Q. Is the check result normal?
Go to Step 5.
Reinstall the G and yaw rate sensor correctly.

STEP 5. M.U.T.-III data list
Check the following service data.

  • Item 08: Lateral G-sensor
  • Item 12: Deviation ratio sensor

Q. Is the check result normal?
Go to Step 6.
Replace the G and yaw rate sensor, and then go to Step 7.

STEP 6. M.U.T.-III data list
Check the following service data.

  • Item 11: Steering angle sensor

Q. Is the check result normal?
Go to Step 7.
Replace the steering wheel sensor, and then go to Step 7.

STEP 7. Check whether the diagnosis code is reset.

Q. Is the diagnosis code No. C123C set?
Replace the ASC-ECU.
This diagnosis is complete.