Code No.C1242: Straight G Sensor Signal


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.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • When hydraulic unit (integrated with G and yaw rate sensor) is replaced, calibrate G and yaw rate sensor (refer to GROUP 35C - On-vehicle Service )

OPERATION



DIAGNOSIS CODE SET CONDITIONS




  • Abnormality in G and yaw rate sensor output value
  • The abnormality is detected by comparing the longitudinal G-sensor value output from the G and yaw rate sensor with the value output from the wheel speed sensor.

PROBABLE CAUSES



  • Malfunction of G and yaw rate sensor
  • Malfunction of wheel speed sensor
  • Malfunction of stop lamp switch
  • Malfunction of 4WD-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C1242 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III other system diagnosis code.
Check if the wheel speed sensor-related diagnosis code is set.

Q. Is the diagnosis code set?
Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. Check of hydraulic unit (integrated with G and yaw rate sensor) installation status.
Check that the hydraulic unit (integrated with G and yaw rate sensor) is installed correctly (Refer to GROUP 35B - Hydraulic unit (integrated with G and yaw rate sensor) <Vehicles with ABS>GROUP 35C - Hydraulic unit (integrated with G and yaw rate sensor) <Vehicles with ASC>).

Q. Is the check result normal?
Go to Step 5.
Reinstall the hydraulic unit (integrated with G and yaw rate sensor) correctly. Then go to Step 5.

STEP 5. M.U.T.-III data list.
Check the following data list (Refer to).

  • Item No.24: Longitudinal G sensor

Q. Is the check result normal?
Go to Step 6.
Replace the hydraulic unit (integrated with G and yaw rate sensor) (Refer to GROUP 35B - Hydraulic unit (integrated with G and yaw rate sensor) <Vehicles with ABS> or GROUP 35C - Hydraulic unit (integrated with G and yaw rate sensor) <Vehicles with ASC>). Then go to Step 7.

STEP 6. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C1242 set?
Replace the 4WD-ECU (Refer to ). Then go to Step 7.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 7. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C1242 set?
Return to Step 1.
This diagnosis is complete.