DTC U1003: G and yaw rate sensor bus-off: 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 U1003 set?
YES : Go to Step 3.
NO : The procedure is complete.
- STEP 3. Connector check: A-05 ASC-ECU connector, C-46 S-AWC-ECU connector, C-47 intermediate connector, C-50 joint connector
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the connector, and then go to Step 7.
- STEP 4. Wiring harness check between A-05 ASC-ECU connector terminal No. 18 and C-38 G and yaw rate sensor connector terminal No. 2, between A-05 ASC-ECU connector terminal No. 19 and C-38 G and yaw rate sensor connector terminal No. 3, between C-46 S-AWC-ECU connector terminal No. 9 and C-38 G and yaw rate sensor connector terminal No. 2, between C-46 S-AWC-ECU connector terminal No. 10 and C-38 G and yaw rate sensor connector terminal No. 3
- Open or short circuit check of communication circuit
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the wiring harness, and then go to Step 7.
- STEP 5. Check whether the DTC is reset.
Q: Is DTC U1003 set?
YES : Replace the G and yaw rate sensor.(Refer to G AND YAW RATE SENSOR .) Then go to Step 6.
NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
- STEP 6. Check whether the DTC is reset.
Q: Is DTC U1003 set?
YES : Replace the hydraulic unit (incorporates in ASC-ECU).(Refer to HYDRAULIC UNIT .) Then go to Step 7.
NO : The procedure is complete.
- STEP 7. Check whether the DTC is reset.
Q: Is DTC U1003 set?
YES : Return to Step 1.
NO : The procedure is complete.