Inspection Procedure 1: The M.U.T.-III cannot communicate with the TCL/ASC system.



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 ).
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • If the power is supplied with the earth circuit of CAN communication devices open circuited, a potential abnormality may occur to the connected CAN bus line.

TECHNICAL DESCRIPTION (COMMENT)


When the M.U.T.-III cannot communicate with the TCL/ASC system, there may be a malfunction to the CAN bus lines, ASC-ECU power supply circuit system, earth, or ASC-ECU.

PROBABLE CAUSES



  • Damaged wiring harness and connectors
  • ASC-ECU malfunction
  • Wrong M.U.T.-III wiring harness
  • Abnormality in battery or alternator
  • Abnormality in power supply voltage to ASC-ECU
  • ECU malfunction of other system

DIAGNOSIS


Using M.U.T.-III, diagnose the CAN bus lines.


Using the M.U.T.-III, diagnose the CAN bus lines.

Q. Is the check result normal?

Check and repair the power supply circuit system ( Refer to )
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).