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Diagnosis system for a motor vehicle

  • US 4,975,846 A
  • Filed: 12/22/1989
  • Issued: 12/04/1990
  • Est. Priority Date: 10/09/1987
  • Status: Expired due to Term
First Claim
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1. A system for diagnosing an automotive engine mounted on a motor vehicle and controlled by an electronic control system, comprising:

  • a diagnosis device including a computer having a central processing unit, a plurality of communication systems capable of operating with different signal formats and being operatively connected to said computer, and a memory, said memory storing a plurality of programs for diagnosing said engine through said electronic control system, said memory further storing an identification code representing one of said communication systems which is available to receive data signals from said electronic control system;

    connecting means for connecting said computer to said one electronic control system;

    first means provided in said computer for reading the identification code and for producing an identification code signal;

    select means responsive to said identification code signal for selecting said one communication system from said plurality of communication systems;

    second means for applying a data demand signal to said electronic control system;

    third means for receiving data from said electronic control system through said selected one communication system; and

    display means for displaying received data in a form of diagnosis data.

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