DTC C123B: Prolonged operation of ASC: Diagnosis
Required Special Tools:
- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A
- STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines. (Refer to TROUBLESHOOTING .) After repairing the CAN bus line, go to Step 2.
- STEP 2. DTC recheck after repairing the CAN bus line
Q: Is DTC C123B set?
YES : Go to Step 3.
NO : This diagnosis is complete.
- STEP 3. Scan tool diagnostic trouble code
Check that DTCs C100A, C1015, C1020, C102B, C1011, C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041, C1042, C1043, C1044, C1219, C2205, C123C, and C2204 are also set.
Q: Are DTCs C100A, C1015, C1020, C102B, C1011, C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041, C1042, C1043, C1044, C1219, C2205, C123C, and C2204 also set?
YES : Carry out the diagnosis for the diagnostic trouble code that is set. (Refer to DIAGNOSTIC TROUBLE CODE CHART .) Then go to Step 10.
NO : Go to Step 4.
- STEP 4. Check of G and yaw rate sensor installation status
Check that the G and yaw rate sensor is installed correctly.
Q: Is the check result normal?
YES : After checking the G and yaw rate sensor, perform the calibration of the G and yaw rate sensor to make ASC-ECU relearn the neutral point.(Refer to IN THE EVENT OF A DISCHARGED BATTERY .) Then go to Step 5.
NO : Reinstall the G and yaw rate sensor correctly. (Refer to G AND YAW RATE SENSOR .) Then go to Step 10.
- STEP 5. Scan tool service data
Check the following service data. (Refer to DATA LIST REFERENCE TABLE .)
- Item 08: Lateral G sensor
- Item 09: G sensor
- Item 12: Yaw rate sensor
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the G and yaw rate sensor. (Refer to G AND YAW RATE SENSOR .) Then go to Step 10.
- STEP 6. Check of steering wheel sensor installation status
Check that the steering wheel sensor is installed correctly.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Install the steering wheel sensor correctly. (Refer to STEERING WHEEL SENSOR .) Then go to Step 7.
- STEP 7. Wheel alignment check
Refer to FRONT WHEEL ALIGNMENT CHECK AND ADJUSTMENT .
Q: Is the check result normal?
YES : After checking the wheel alignment, perform the calibration of steering wheel sensor to make ASC-ECU relearn the neutral point.(Refer to STEERING WHEEL SENSOR CALIBRATION .) Then go to Step 8.
NO : After adjusting the wheel alignment, perform the calibration of steering wheel sensor to make ASC-ECU relearn the neutral point.(Refer to STEERING WHEEL SENSOR CALIBRATION .) Then go to Step 8.
- STEP 8. Scan tool service data
Check the following service data. (Refer to DATA LIST REFERENCE TABLE .)
- Item 11: Steering angle
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the steering wheel sensor. (Refer to STEERING WHEEL SENSOR .) Then go to Step 10.
- STEP 9. Check whether the DTC is reset.
Q: Is DTC C123B set?
YES : Replace the hydraulic unit (incorporates in ASC-ECU).(Refer to HYDRAULIC UNIT .) Then go to Step 10.
NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
- STEP 10. Check whether the DTC is reset.
Q: Is DTC C123B set?
YES : Return to Step 1.
NO : The procedure is complete.