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SMALL/GROSS LEAK CHECK

  • US 20010042399A1
  • Filed: 08/30/1999
  • Published: 11/22/2001
  • Est. Priority Date: 08/30/1999
  • Status: Active Grant
First Claim
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1. A method of detecting a small or gross leak in an evaporative emission control system of an automotive vehicle comprising:

  • purging said evaporative emission control system;

    sealing said evaporative emission control system;

    monitoring a vacuum switch coupled to said evaporative emission control system for an opening event due to a loss of a natural vacuum created in said evaporative emission control system;

    determining if a leak check timer has exceeded a first or second predetermined threshold value if said opening event is detected; and

    setting a first fault code indicating that said small leak has been detected if said leak check timer has not exceeded said first predetermined threshold value and setting a second fault code indicating that said small gross leak has been detected if said leak check timer has not exceeded said second predetermined threshold value.

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