Code No. U0125 G and yaw rate sensor message time-out error/message error
Code No. U1003 G and yaw rate sensor bus-off












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, CAN Bus Diagnosis Table ).
  • 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
Code No. U0125
  • This diagnosis code is set when the ASC-ECU cannot receive the signal from the G and yaw rate sensor although there is no abnormality in ASC-ECU supply voltage.
    note When an abnormality is present in the ASC-ECU supply voltage, diagnosis code No. C2100 (low voltage error) is set, and diagnosis code No. U0125 is not set.
Code No. U1003
  • This diagnosis code is set when the communication error occurs in the exclusive CAN bus communication between the ASC-ECU and the G and yaw rate sensor.

PROBABLE CAUSES

  • Wiring harness or connector failure for the special CAN bus lines between ASC-ECU and the G and yaw rate sensor
  • 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 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .) On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No. U0125 or U1003 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Connector check: A-58 ASC-ECU connector, C-137 G and yaw rate sensor connector

Q. Is the check result normal?
Go to Step 4.
Repair the connector, and then go to Step 7.

STEP 4. Wiring harness check between A-58 ASC-ECU connector terminal No. 18 and C-137 G and yaw rate sensor connector terminal No. 2 as well as between A-58 ASC-ECU connector terminal No. 19 and C-137 G and yaw rate sensor connector terminal No. 3

  • Check the communication circuit for open and short circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness, and then go to Step 7.

STEP 5. Diagnosis code recheck

Q. Is diagnosis code No. U0125 or U1003 set?
Replace the G and yaw rate sensor.(Refer to .) Then go to Step 6.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 6. Diagnosis code recheck

Q. Is diagnosis code No. U0125 or U1003 set?
Replace the hydraulic unit (ASC-ECU). (Refer to .) Then go to Step 7.
This diagnosis is complete.

STEP 7. Diagnosis code recheck

Q. Is diagnosis code No. U0125 or U1003 set?
Return to Step 1.
This diagnosis is complete.

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