Diagnostic procedure
- STEP 1. Scan tool CAN bus diagnostics
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. Check whether the DTC is reset.
Q: Is DTC No. C1242 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
- STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to TROUBLESHOOTING .)
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
- STEP 4. Scan tool diagnostic trouble code
Q: Is DTC No. C2204 set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 5.
- STEP 5. Scan tool diagnostic trouble code
Check if the local CAN communication-related, stoplight switch-related, or wheel speed sensor-related diagnostic trouble code is set.
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 6.
- STEP 6. Check of G and yaw rate sensor installation status
Check that the G and yaw rate sensor is installed correctly. (Refer to G AND YAW RATE SENSOR .)
Q: Is the check result normal?
YES : Go to Step 7.
NO : Reinstall the G and yaw rate sensor correctly. Then go to Step 7.
- STEP 7. Scan tool service data
Item No. 31: Longitudinal G sensor (refer to DATA LIST REFERENCE TABLE .)
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the G and yaw rate sensor. (Refer to G AND YAW RATE SENSOR .) Then go to Step 8.
- STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C1242 set?
YES : Replace the AWC-ECU.(Refer to AWC-ECU .) Then go to Step 9.
NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
- STEP 9. Check whether the DTC is reset.
Q: Is DTC No. C1242 set?
YES : Return to Step 1.
NO : This diagnosis is complete.