Diagnosis system for a motor vehicle

  • US 4,926,330 A
  • Filed: 11/30/1988
  • Issued: 05/15/1990
  • Est. Priority Date: 12/21/1987
  • Status: Expired due to Term
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First Claim
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1. A system for diagnosing a motor vehicle and an electronic control system for controlling an engine mounted on the vehicle, the control system having sensors for detecting operating conditions of the engine, comprising:

  • a diagnosis device including a case and a computer having a central processing unit and a memory storing a plurality of programs for diagnosing the electronic control system disposed in said case;

    a connector connecting the computer to the electronic control system;

    the diagnosis device including a keyboard for inputting a diagnosis mode and a tester mode;

    means comprising terminals provided on the case of the diagnosis device for receiving an analog signal from a part of an electric system of the vehicle other than the electronic control system which controls the engine;

    a converter disposed in said case for converting the analog signal received at the terminals to a digital signal and for applying the converted digital signal to the computer;

    the computer including;

    determining means for determining whether the diagnosis mode for diagnosing the electronic control system which controls the engine or the tester mode for testing the part of the electric system of the vehicle other than the electronic control system which controls the engine, which part produces the analog signal, is input through the keyboard and for producing a diagnosis mode signal or a tester mode signal in dependency on the determination;

    data demand means responsive to the diagnosis mode signal for applying a data demand signal to the electronic control system;

    data receiving means for receiving data from the electronic control system; and

    receiving means responsive to the tester mode signal for receiving said analog signal from the vehicle through the terminals and applying the analog signal to the converter for diagnosing the analog signal; and

    display means on the diagnosis device for displaying received data in a form of diagnosis data for both the tester mode and the diagnosis mode.

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