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 set. Prior to this diagnosis, diagnose
the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
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- ABS-ECU monitors if the output of G sensor is normal or not.
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DIAGNOSIS CODE SET CONDITIONS
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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.
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- 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
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STEP 1. M.U.T.-III CAN bus diagnostics
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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 the diagnosis code No.C1242 set?
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Go to Step 3.
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The procedure 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 set
or not.
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Q.
Is any diagnosis code set?
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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. M.U.T.-III data list
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Check the following data list (Refer to ).
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ), and
then go to Step 6.
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STEP 5. Check whether the diagnosis code is reset.
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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 the diagnosis code No.C1242 set?
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Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ). Then
go to Step 6.
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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 6. Check whether the diagnosis code is reset.
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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 the diagnosis code No.C1242 set?
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Go to Step 1.
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The procedure is complete.
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