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Evaporative system leak detection upon refueling

  • US 7,204,237 B2
  • Filed: 04/07/2005
  • Issued: 04/17/2007
  • Est. Priority Date: 04/07/2005
  • Status: Active Grant
First Claim
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1. A loose or missing fuel cap detection method for an evaporative emission control system of an automotive vehicle, the method comprising:

  • running a fuel level change diagnostic to determine if a refueling event occurred;

    determining if one or more cold start conditions are met;

    running one or more leak tests on the system to determine if one or more leaks is present; and

    storing data that is indicative of a loose or missing fuel cap if the one or more leaks is present and the refueling event occurred.

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