This is a 2011 Ford Fusion with a P0455 (EVAP) System Leak Detected (Gross Leak/No Flow) trouble code. In this video I will show you how to test the EVAP purge solenoid, both mechanically and electrically. All that is needed is a generic scan tool and a test light. Of course I show the scope tests as well but it is not needed to confirm solenoid operation and control.

Engine Performance Diagnostics chapter 3

Topics discussed


  • check engine light (P0455)
  • fuel smell coming from the charcoal canister


  • replace sticking purge solenoid

test shown

  • how to test a purge solenoid
  • how to test the purge solenoid wiring
  • how to verify the computers control of the purge solenoid

Tools used

end faq

Related videos:

How to test a fuel injector (open winding) Nissan:

How to test a purge solenoid (Mazda P0443, P0455):

2008 Chevy Avalanche EVAP Vent Solenoid Test (P0449, P0455):

end faq


EVAP System Testing

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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