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Evaporative system and method of diagnosing same

  • US 6,305,361 B1
  • Filed: 03/30/2000
  • Issued: 10/23/2001
  • Est. Priority Date: 01/25/1996
  • Status: Expired due to Fees
First Claim
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1. A method of diagnosing an evaporative system, comprising the steps of:

  • opening a purge valve, provided on a line connected between said evaporative system and an intake tube, in a closed condition of a drain valve connected to a canister;

    subsequently detecting a pressure in said evaporative system;

    subsequently closing said purge valve when said detected pressure reaches a predetermined value;

    subsequently detecting a pressure in said evaporative system in a closed condition of a gauge valve for generating a standard leak between the evaporative system and ambient air, and detecting the pressure in said evaporative system in an open condition of said gauge valve, so as to detect leakage of the evaporative system;

    and performing a diagnosis of said evaporative system based on a differential pressure with respect to ambient air and a pressure change corresponding to said detected pressures at a time of opening said gauge valve and at a time of not opening said gauge valve.

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