Code No. C1242 Abnormality in G


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

  • The G sensor is incorporated in the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality is detected by comparing the G sensor value output from the G sensor with the value output from the wheel speed sensor.

PROBABLE CAUSES

  • Improper installation of the G sensor
  • Malfunction of wheel speed sensor
  • ABS-ECU malfunction
  • External noise interference
  • When the vehicle is driven on a drum roller

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use scan tool 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 - CAN Bus Diagnosis table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is the diagnosis code No. C1242 set?
Go to Step 3.
The procedure is complete.

STEP 3. Check the wheel speed sensor-related diagnosis code.
Use the scan tool to check whether the wheel speed sensor-related diagnosis code is set or not.

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

STEP 4. M.U.T.-III data list
Check the following service data.

  • Item 09: G sensor

Q. Is the check result normal?
Go to Step 5.
Replace the ABS-ECU, and then go to Step 6.

STEP 5. Check whether the diagnosis code is reset.

Q. Is the diagnosis code No. C1242 set?
Replace the ABS-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is reset.

Q. Is the diagnosis code No. C1242 set?
Go to Step 1.
The procedure is complete.