Code No. C123C
Sensor cluster malfunction
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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 - CAN Bus Diagnostics Table ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the steering wheel sensor is replaced, always carry out calibration to make
ASC-ECU learn the neutral point (Refer to ).
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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 if any malfunction below is found:
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- The output value of lateral G and yaw rate is abnormal.
- When abnormality is detected by comparing the value output from the lateral G and
yaw rate with the one from the steering wheel sensor and wheel speed sensor
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- Steering wheel sensor malfunction
- Improperly installed steering wheel sensor
- Malfunction of wheel speed sensor
- ASC-ECU malfunction
- External noise interference
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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.C123C 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 other sensor-related diagnosis code.
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Use M.U.T.-III to check whether the wheel speed sensor-related or steering wheel 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 "Lateral 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 "Lateral 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 (Refer to ).
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- Item 08: Lateral G sensor
- Item 12: Yaw rate sensor
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ),
and then go to Step 10.
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STEP 6. Steering wheel sensor installation check
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Check that the steering wheel sensor is installed correctly.
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Q.
Is the check result normal?
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Go to Step 7.
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Reinstall the steering wheel sensor correctly (Refer to ),
and then go to Step 7.
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STEP 7. Wheel alignment check
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Refer to .
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Q.
Is the check result normal?
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After checking the wheel alignment, carry out calibration of steering wheel sensor
to make ASC-ECU relearn the neutral point (Refer to ). Then
go to Step 8.
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After adjusting the wheel alignment, carry out calibration of steering wheel sensor
to make ASC-ECU relearn the neutral point (Refer to ). Then
go to Step 8.
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STEP 8. M.U.T.-III data list
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Check the following data list (Refer to ).
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- Item 11: Steering angle sensor
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the steering wheel sensor (Refer to ),
and then go to Step 9.
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STEP 9. Check whether the diagnosis code is stored again.
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(1)Erase the diagnosis code.
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(2)Turn the steering wheel to either right or left at 20 km/h or more.
note |
The ASC warning/operation lamp and the ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or
left.
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Q.
Is diagnosis code No.C123C stored?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ),
and then go to Step 10.
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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 10. Check whether the diagnosis code is stored again.
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(1)Erase the diagnosis code.
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(2)Turn the steering wheel to either right or left at 20 km/h or more.
note |
The ASC warning/operation lamp and the ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or
left.
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Q.
Is diagnosis code No.C123C stored?
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Return to Step 1.
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This diagnosis is complete.
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