Code No. C1242
Longitudinal G sensor signal
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caution |
- If there is
any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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ASC-ECU monitors if the output of G and yaw rate sensor is normal or not.
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DIAGNOSIS CODE SET CONDITIONS
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This diagnosis code is stored when 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.
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- Malfunction of wheel speed sensor
- ASC-ECU malfunction
- External noise interference
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note |
When rotated on the four-wheel drum tester, this diagnosis code may be stored.
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is diagnosis code No.C1242 stored?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check the wheel speed sensor-related diagnosis code.
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Use the M.U.T.-III to check whether the wheel speed sensor-related diagnosis code is stored or
not.
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Q.
Is the diagnosis code stored?
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Troubleshoot for the relevant diagnosis code (Refer to ).
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Go to Step 4.
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STEP 4. Check whether the ASC-ECU is installed properly.
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Check whether the ASC-ECU is installed correctly. Refer to .
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Q.
Is the check result normal?
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Execute "G sensor calibration" on "Special function". After the calibration is
performed (Refer to ), turn the ignition switch from "OFF"
to "ON". Then go to Step 5.
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Install the ASC-ECU properly, and execute "G sensor calibration" on "Special function".
After the calibration is performed (Refer to ) , turn the
ignition switch from "OFF" to "ON". Then go to Step 5.
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STEP 5. M.U.T.-III data list
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Check the following data list under curb weight condition or one occupant (driver) only
in the vehicle, on a flat road (Refer to ).
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Q.
Is the check result normal?
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Turn the ignition switch to the "ON" from "OFF" position. Then go to Step 6.
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ), and
then go to Step 7.
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STEP 6. Check whether the diagnosis code is stored again.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or higher.
note |
The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h
or higher.
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Q.
Is diagnosis code No.C1242 stored?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ), and
then go to Step 7.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How
to Cope with Intermittent Malfunctions ).
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STEP 7. Check whether the diagnosis code is stored again.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or higher.
note |
The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h
or higher.
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Q.
Is diagnosis code No.C1242 stored?
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Return to Step 1.
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This diagnosis is complete.
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