DTC U1003: G and yaw rate sensor bus-off: Diagnosis

WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

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.
Use scan tool to 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 CAN BUS DIAGNOSTICS TABLE .) On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC U1003 set?
1. YES: Go to Step 3.
2. NO: The procedure is complete.
STEP 3. Connector check: A-51 ASC-ECU connector, C-137 G and yaw rate sensor connector
Q: Is the check result normal?
1. YES: Go to Step 4.
2. NO: Repair the connector, and then go to Step 7.
STEP 4. Wiring harness check between A-51 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 3 as well as between A-51 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 2
- Check the communication circuit for open and short circuit.
Q: Is the check result normal?
1. YES: Go to Step 5.
2. NO: Repair the wiring harness, and then go to Step 7.
STEP 5. DTC recheck
Erase the DTC.

Q: Is DTC U1003 set?
1. YES: Replace the G and yaw rate sensor (Refer to G AND YAW RATE SENSOR ). Then go to Step 6.
2. NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
STEP 6. DTC recheck
Erase the DTC.

Q: Is DTC U1003 set?
1. YES: Replace the hydraulic unit (integrated with ASC-ECU). (Refer to HYDRAULIC UNIT .) Then go to Step 7.
2. NO: The procedure is complete.
STEP 7. DTC recheck
Erase the DTC.

Q: Is DTC U1003 set?
1. YES: Return to Step 1.
2. NO: The procedure is complete.