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 2.
NO : Repair the CAN bus lines. (Refer to TROUBLESHOOTING .)
- STEP 2. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to TROUBLESHOOTING .)
Q: The diagnostic trouble code is set.
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
- STEP 3. ASC-ECU connector, G and yaw rate sensor connector, AWC-ECU connector, intermediate connector, J/C (7) check: A-05, C-38, C-46, C-47, C-50
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the defective connector. Then go to Step 7.
- STEP 4. Check the wiring harness between C-46 AWC-ECU connector terminal No. 9, 10 and C-38 G and yaw rate sensor connector terminal No. 2, 3, and between C-46 AWC-ECU connector terminal No. 9, 10 and A-05 ASC-ECU connector terminal No. 18, 19.
Check the wiring harness for open and short circuit (to ground, to power supply, or line-to-line).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the wiring harness. Then go to Step 7.
- STEP 5. Scan tool service data
Check the following service data. (Refer to DATA LIST REFERENCE TABLE .)
- Item No. 26: Yaw rate sensor
- Item No. 29: Lateral G sensor
- Item No. 31: Longitudinal G 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 6.
- STEP 6. Check whether the diagnostic trouble code is reset.
Q: Is DTC No. U1003 set?
YES : Replace the AWC-ECU.(Refer to AWC-ECU .) Then go to Step 7.
NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
- STEP 7. Check whether the DTC is reset.
Q: Is DTC No. U1003 set?
YES : Return to Step 1.
NO : This diagnosis is complete.