DTC U0125: G And Yaw Rate Sensor Message Time-Out Error/Message Error: Diagnosis

WARNING: This page is about a different variant/trim than selected.

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?
1. YES: Go to Step 2.
2. NO: Repair the CAN bus lines. (Refer to TROUBLESHOOTING .) After repairing the CAN bus line, go to Step 3.
STEP 2. Check for diagnostic trouble codes
Check if diagnostic trouble code No. U0251, U0440, and U0435 are simultaneously set in ASC-ECU.

Q: Are DTCs U0251, U0440 or U0435 set?
1. YES: Perform troubleshooting for the diagnostic trouble code that is set. (Refer to DTC SET CONDITIONS .)
2. NO: Go to Step 3.
STEP 3. DTC recheck after repairing the CAN bus line
Q: Is DTC U0125 set?
1. YES: Go to Step 4.
2. NO: This diagnosis is complete.
STEP 4. Connector check: A-05 ASC-ECU connector, C-46 AWC-ECU connector, C-47 intermediate connector
Q: Is the check result normal?
1. YES: Go to Step 5.
2. NO: Repair the connector, and then go to Step 8.
STEP 5. Wiring harness check between A-05 ASC-ECU connector terminal No. 18 and C-38 G and yaw rate sensor connector terminal No. 3, between A-05 ASC-ECU connector terminal No. 19 and C-38 G and yaw rate sensor connector terminal No. 2, between C-46 AWC-ECU connector terminal No. 9 and C-38 G and yaw rate sensor connector terminal No. 3, between C-46 AWC-ECU connector terminal No. 10 and C-38 G and yaw rate sensor connector terminal No. 2
- Open or short circuit check of communication circuit
  Q: Is the check result normal?
  1. YES: Go to Step 6.
  2. NO: Repair the wiring harness, and then go to Step 8.
STEP 6. Check whether the DTC is reset.
Erase the DTC.

Q: Is DTC U0125 set?
1. YES: Replace the G and yaw rate sensor. (Refer to G AND YAW RATE SENSOR .) Then go to Step 7.
2. NO: Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 7. Check whether the DTC is reset.
Erase the DTC.

Q: Is DTC U0125 set?
1. YES: Replace the hydraulic unit (integrated with ASC-ECU). (Refer to HYDRAULIC UNIT .) Then go to Step 8.
2. NO: The procedure is complete.
STEP 8. Check whether the DTC is reset.
Erase the DTC.

Q: Is DTC U0125 set?
1. YES: Return to Step 1.
2. NO: The procedure is complete.