S-AWC (Super All Wheel Control)

Code No.C123C: G and Yaw Rate Sensor (Faulty Signal)

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.

- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

- When the steering wheel sensor is replaced, calibrate the steering wheel sensor Testing and Inspection), and reset the steering wheel sensor correction amount stored in the AWC-ECU. (Item No. 1: SAS adjusted value S-AWC Special Function).

- Do not drop the G and yaw rate sensor or subject it to a shock.

- When G and yaw rate sensor is replaced, calibrate G and yaw rate sensor Testing and Inspection.)

OPERATION

AWC-ECU receives the G and yaw rate sensor data from ASC-ECU via the CAN communication.

DIAGNOSTIC TROUBLE CODE SET CONDITIONS

This diagnostic trouble code is set when the abnormality below is detected:

- Abnormality in G and yaw rate sensor output value

- The yaw rate correction amount of the G and yaw rate sensor exceeds the specified range.

- This diagnostic trouble code is set when AWC-ECU determines that an abnormality is present by comparing the measurement values of G and yaw rate sensor with the calculation value of G and yaw rate calculated by the measurement values of the wheel speed sensor and steering wheel sensor.

PROBABLE CAUSES

- Improper installation of G and yaw rate sensor

- Malfunction of G and yaw rate sensor

- Malfunction of wheel speed sensor

- Improper installation of steering wheel sensor

- Malfunction of steering wheel sensor

- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.

Use scan tool to perform the CAN bus diagnosis.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart). After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C123C set?

YES Go to Step 3.
NO This diagnosis is complete.
STEP 3. M.U.T.-III diagnostic trouble code.

Check the ASC diagnostic trouble code. Active Stability Control System (ASC)).

Q. Is the check result normal?

YES Perform the relevant troubleshooting.
NO Go to Step 4.
STEP 4. M.U.T.-III diagnostic trouble code.

Check if the wheel speed sensor-related, or steering wheel sensor-related diagnostic trouble code is set.

Q. Is the diagnostic trouble code set?

YES Perform the relevant troubleshooting.
NO Go to Step 5.
STEP 5. Check of G and yaw rate sensor installation status.

Check that the G and yaw rate sensor is installed correctly. Service and Repair).

Q. Is the check result normal?

YES Go to Step 6.
NO Reinstall the G and yaw rate sensor correctly. Then go to Step 6.
STEP 6. M.U.T.-III data list.

Check the following data list. (Refer to Data List Reference Table).

- Item No.25: Yaw rate sensor

- Item No.26: Lateral G sensor

Q. Is the check result normal?

YES Go to Step 7.
NO Replace the G and yaw rate sensor. Service and Repair). Then go to Step 11.
STEP 7. Check of steering wheel sensor installation status.

Check that the steering wheel sensor is installed correctly. Service and Repair).

Q. Is the check result normal?

YES Go to Step 8.
NO Install the steering wheel sensor correctly. Then go to Step 8.
STEP 8. Wheel alignment check.

Q. Is the check result normal?

YES After checking the wheel alignment, calibrate the steering wheel sensor Testing and Inspection), and reset the steering wheel sensor correction amount stored in the AWC-ECU.(Refer to S-AWC Special Function). Then go to Step 9.
NO After adjusting the wheel alignment, calibrate the steering wheel sensor Testing and Inspection), and reset the steering wheel sensor correction amount stored in the AWC-ECU.(Refer to S-AWC Special Function). Then go to Step 9.
STEP 9. M.U.T.-III data list.

Item 8: Steering angle sensor (refer to Data List Reference Table).

Q. Is the check result normal?

YES Go to Step 10.
NO Replace the steering wheel sensor. Service and Repair). Then go to Step 10.
STEP 10. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C123C set?

YES Replace the AWC-ECU. (Refer to AWC-ECU Removal and Installation). Then go to Step 11.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions).
STEP 11. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C123C set?

YES Return to Step 1.
NO This diagnosis is complete.