×

PURGE VALVE LEAK DIAGNOSTIC SYSTEMS AND METHODS

  • US 20090211340A1
  • Filed: 01/19/2009
  • Published: 08/27/2009
  • Est. Priority Date: 02/21/2008
  • Status: Active Grant
First Claim
Patent Images

1. A leak diagnostic system for a vehicle, comprising:

  • a tank pressure module that selectively outputs first and second fuel tank pressures when an engine is shut down and when engine vacuum is greater than a predetermined engine vacuum, respectively; and

    a leak diagnostic module that selectively diagnoses a leak in a fuel vapor purge valve based on said second fuel tank pressure when said first fuel tank pressure is less than a first predetermined pressure.

View all claims
  • 8 Assignments
Timeline View
Assignment View
    ×
    ×