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Method of detecting a fault in an automotive system

  • US 5,243,324 A
  • Filed: 11/07/1991
  • Issued: 09/07/1993
  • Est. Priority Date: 11/07/1991
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a fault in an automotive system having a power supply and including counter means for recording each occurrence of a fault in said system, said method comprising the steps of:

  • a. electrically energizing said system;

    b. monitoring a power supply value of said vehicle power supply during a predetermined time interval;

    c. detecting an inability of said system to be placed into a desired operating state and generating a fault signal in response thereto;

    d. recording each occurrence of said fault signal in said counter means only when said power supply value is within predetermined limits;

    e. repeating the above steps until the number of occurrences of said fault signals exceeds a predetermined number; and

    f. providing a human detectable fault signal indication when the number of fault occurrences exceeds said predetermined number in said predetermined time interval.

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