Patent ID: 6405110
Filing Date: 2002-06-11
Classification: H04L

Abstract:
A failure diagnosis apparatus for diagnosing a failure in a vehicular electronic control system, comprising:a plurality of electronic control related members including electronic control apparatus mounted on a vehicle and controllers for electronically controlling the electronic control apparatus; a multiplex communication system including a multiplex communication line connected to the plurality of electronic control related members as communication elements; an input portion for receiving communication signal information from the multiplex communication line; and a signal analyzing portion for analyzing the communication signal information received via the input portion, the signal analyzing portion including first failed portion specifying means for specifying a region which may have failed in the multiple communication system from the communication signal information based on presence or absence of communication by the plurality of electronic control related members, and second failed portion specifying means for specifying the electronic control related member which may have failed in the plurality of electronic control related members based on a data content of a communication signal provided from the communication signal information.