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SYSTEM AND METHOD FOR PERFORMING EVAPORATIVE LEAK DIAGNOSTICS IN A VEHICLE

  • US 20120215399A1
  • Filed: 02/07/2012
  • Published: 08/23/2012
  • Est. Priority Date: 02/18/2011
  • Status: Active Grant
First Claim
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1. A method for performing an evaporative leak diagnostic for a vehicle, comprising:

  • commanding a valve in a diagnostic module to a vent position, the valve connecting a fuel system to atmosphere;

    operating a pump in the diagnostic module to measure a reference pressure across an orifice in the diagnostic module to provide a threshold;

    commanding the valve to a test position;

    operating the pump to place the fuel system in a low pressure state;

    measuring a series of pressures in the fuel system; and

    providing a diagnostic code after comparing the series of pressures to the threshold.

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