DTC C123C: G and Yaw Rate Sensor System (Lateral G and Yaw Rate Sensor Output Signal): Diagnosis
- STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics
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Use scan tool (M.U.T.-IIISE) to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ).
- STEP 2. Scan tool (M.U.T.-IIISE) DTC
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Check the ASC DTC (Refer to DIAGNOSTIC TROUBLE CODE CHART ).
Q: Is the check result normal?
YES: Perform the relevant troubleshooting.
NO: Go to Step 3.
- STEP 3. Scan tool (M.U.T.-IIISE) other system DTC
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Check if the wheel speed sensor-related, or steering wheel sensor-related DTC is set.
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 4.
- STEP 4. Check of hydraulic unit (integrated with G and yaw rate sensor) installation status
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Check that the hydraulic unit (integrated with G and yaw rate sensor) is installed correctly (Refer to HYDRAULIC UNIT (INTEGRATED WITH G AND YAW RATE SENSOR) ).
Q: Is the check result normal?
YES: Go to Step 5.
NO: Reinstall the hydraulic unit (integrated with G and yaw rate sensor) correctly, and then carry out the calibration of the G and yaw rate sensor to make ASC-ECU learn the neutral point. Then go to Step 5.
- STEP 5. Scan tool (M.U.T.-IIISE) data list
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Check the following data list (Refer to DATA LIST REFERENCE TABLE ).
- Item No. 39: Yaw rate
- Item No. 40: Lateral G
Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace the hydraulic unit (integrated with G and yaw rate sensor), and then carry out the calibration of the G and yaw rate sensor to make ASC-ECU learn the neutral point.
- STEP 6. Check of steering wheel sensor installation status
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Check that the steering wheel sensor is installed correctly (Refer to STEERING WHEEL SENSOR ).
Q: Is the check result normal?
YES: Go to Step 7.
NO: Install the steering wheel sensor correctly. Then go to Step 7.
- STEP 7. Wheel alignment check
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Q: Is the check result normal?
YES: After checking the wheel alignment, calibrate the steering wheel sensor (Refer to STEERING WHEEL SENSOR CALIBRATION ), and reset the steering wheel sensor correction amount set in the AWC-ECU (Refer to AWC-ECU <AWD> ). Then go to Step 8.
NO: After adjusting the wheel alignment, calibrate the steering wheel sensor (Refer to STEERING WHEEL SENSOR CALIBRATION ), and reset the steering wheel sensor correction amount set in the AWC-ECU (Refer to AWC-ECU <AWD> ). Then go to Step 8.
- STEP 8. Scan tool (M.U.T.-IIISE) data list
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Check the following data list (Refer to DATA LIST REFERENCE TABLE ).
- Item No. 21: Steering angle
Q: Is the check result normal?
YES: Go to Step 9.
NO: Replace the steering wheel sensor (Refer to STEERING WHEEL SENSOR ).
- STEP 9. Check whether the DTC is set again
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Q: Is the DTC C123C set?
YES: Replace the AWC-ECU (Refer to AWC-ECU <AWD> ).
NO: This diagnosis is complete.