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GM EVAP Vent Solenoid Testing

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Published on Feb 15, 2012

2002 Chevy Silverado 4.8L with a P0449 EVAP system Vent Control Circuit Low trouble code. The vent solenoid on every EVAP system is a normally open solenoid. When the computer performs a leak test, it will close this solenoid. A common problem on GM EVAP vent solenoids is they will stick open and cause EVAP large leak codes. In this particular case we are dealing strictly with an electrical system fault. The information contained in this video will apply to all ground side switched computer controlled devices (solenoids, relays, motors etc)
There were three separate codes on this truck. Here are the videos for the other two codes
How to test a fuel gauge P0463 (thermistor circuit design) - GM
https://youtu.be/SIR-quUzZwY
How to troubleshoot an EVAP Pressure Sensor problem P0452 - GM https://youtu.be/CkgrMasd57s

Engine Performance Diagnostics chapter 3

Symptoms
- check engine light (P0449 fault code)

Fix
- replace vent solenoid (open solenoid winding)

Tests shown
- how to test an EVAP vent solenoid
- how to determine power or ground side switching
- how to perform a circuit integrity test
- how to identify circuit design on a wiring diagram
- theory an operation of the computer circuitry used to control the vent solenoid
- how to test the computer transistor driver
- how to command the computer to turn on the vent solenoid

Tools used
- scan tool (bi-directional type)
- incandescent test light
- digital multimeter
- back-probing tools

Playlist
- (Chapter 3) Transistors, Solenoids, Computer Controlled Output Testing
https://www.youtube.com/playlist?list...

Related videos
- EVAP leak P0455 (vacuum cut valve-bypass valve test) - Nissan
https://youtu.be/bG0ZllOn02Q
- How to test an EVAP Vent solenoid (applies to all cars) - GM
https://youtu.be/yvzaRRDLIRQ
- 2008 Chevy Avalanche EVAP Vent Solenoid Test (P0449, P0455) https://youtu.be/UUWOio9ZGWo
- EVAP Leak Test P0455
https://youtu.be/E6yLLqAxhcs

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial.
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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