A common problem with these EVAP vent valves is a broken wire inside of the insulation! The wiring will look completely fine until you pull on the harness. In this video I will show you how to troubleshoot and repair this condition.

Engine Performance Diagnostics chapter 3

Topics discussed

symptoms

  • check engine light (P0449 trouble code)

fix

  • repair broken wire to the EVAP vent solenoid

test shown

  • how to repair a broken wire right at the connector
  • how to repair a wiring connector
  • how to test an EVAP vent solenoid (valve)
  • how to determine power and ground side switching
  • how to test the computer driver (transistor)
  • how to use scan data to ID an open circuit
  • how to use the "driver test" mode in the Power Probe IV
  • how to use a scan tool in a bi-directional test mode

Tools used

end faq

Related videos:

1997 Dodge Neon no start, crank sensor problems (repair of broken wires at the crank sensor connector shown):

(EVAP) Vent Solenoid Control Circuit P0449 repair - GM:

How to test an EVAP Vent solenoid (applies to all cars) - GM:

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

end faq

 

Playlist

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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On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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