S-AWC (Super All Wheel Control)

Code No.C1242: G and Yaw Rate Sensor System (Abnormality of Longitudinal G Sensor Output 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.

- 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 (refer to - On-vehicle Service 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

- This diagnostic trouble code is set when AWC-ECU determines that an abnormality is present by comparing the longitudinal G that is output from the G and yaw rate sensor during braking with the calculation value calculated by the data from the wheel speed sensor.

PROBABLE CAUSES

- Malfunction of G and yaw rate sensor

- Improper installation of G and yaw rate sensor

- Malfunction of wheel speed sensor

- Malfunction of stoplight switch

- Stoplight switch circuit system malfunction

- 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.C1242 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 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.

Item No.27: Longitudinal G sensor (refer to Data List Reference Table).

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 8.
STEP 7. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C1242 set?

YES Replace the AWC-ECU. (Refer to AWC-ECU Removal and Installation). Then go to Step 8.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions).
STEP 8. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C1242 set?

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