A method for vehicle fault diagnostic apparatus for vehicle fault diagnosis and computer-readable recording medium having recorded fault diagnosis program

For connecting a computer to an electronic control unit of a vehicle and diagnosing the fault condition of the vehicle, the computer is connected to a server which stores required error diagnostic data for error diagnosis, the failure diagnosis data are read from the server, it is carried out a failure diagnosis in a dialog mode with the computer using the read fault diagnosis data, and vehicle data is automatically detected from the electronic control unit by using the read-out fault diagnosis data.