Code No.U0125 G and yaw rate sensor message time-out error/message error








caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • Do not drop or shock the G and yaw rate sensor.
  • When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to ).
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to , and ).

OPERATION
The G and yaw rate sensor outputs the signal to ASC-ECU via the special CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the G and yaw rate sensor signal is not sent to ASC-ECU.

PROBABLE CAUSES

  • Wiring harness or connector failure of CAN bus line
  • G and yaw rate sensor malfunction
  • ASC-ECU malfunction
  • External noise interference

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 4.

STEP 2. Connector check: A-58 ASC-ECU connector, C-137 G and yaw rate sensor connector

Q. Is the check result normal?
Go to Step 3.
Repair the connector, and then go to Step 4.

STEP 3. Wiring harness check between A-58 ASC-ECU connector terminals No.18 and C-137 G and yaw rate sensor connector terminals No.2 and between A-58 ASC-ECU connector terminals No.9 and C-137 G and yaw rate sensor connector terminals No.3

  • Check for open circuit in communication circuit

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness, and then go to Step 6.

STEP 4. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No.U0125 set?
Replace the G and yaw rate sensor (Refer to ), and then go to Step 5.
This diagnosis is complete.

STEP 5. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.U0125 set?
Replace the ASC-ECU (Refer to ), and then go to Step 6.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.U0125 set?
Return to Step 1.
This diagnosis is complete.