Diagnostic procedure

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?
1. YES: Go to Step 3.
2. 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?
1. YES: Go to Step 3.
2. 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?
1. YES: Perform the relevant troubleshooting.
2. NO: Go to Step 4.
STEP 4. Scan tool diagnostic trouble code
Q: Is DTC No. C2204 set?
1. YES: Perform the relevant troubleshooting.
2. 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?
1. YES: Perform the relevant troubleshooting.
2. 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?
1. YES: Go to Step 7.
2. 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?
1. YES: Go to Step 8.
2. 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?
1. YES: Replace the AWC-ECU. (Refer to AWC-ECU .) Then go to Step 9.
2. 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?
1. YES: Return to Step 1.
2. NO: This diagnosis is complete.