Inspection Procedure 1: M.U.T.-III communication with ASC system is impossible.


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 Diagnostics Table ).
  • If the power is supplied with the earth circuit of CAN communication device open circuited, an electric potential abnormality may occur to the CAN bus lines.
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the G and yaw rate sensor and the steering wheel sensor (Refer to and ).

COMMENTS ON TROUBLE SYMPTOM


When M.U.T.-III cannot communicate with the ASC system, the CAN bus lines, ASC-ECU power supply circuit system, earth, or ASC-ECU may be faulty.

PROBABLE CAUSES



M.U.T.-III CAN bus diagnosis.
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Check the power supply circuit, and repair if necessary (Refer to ).
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting ).