The Trainer #70 - EVAP Testing Tips

The purpose of the Evaporative Emissions system, lovingly referred to as “EVAP” by many of us, is pretty straight forward – keep the fuel vapors locked up and out of the atmosphere.

Well, it sounds straight forward, but it can be a little overwhelming when it doesn’t work as it was designed to. The first order of business is to understand what type of system the vehicle in question is equipped with. Even if you work on only one model line, you are still faced with variations on a theme, so it is always an important first step to identify what kind of detection strategy is in play. For example, using pressure to test a system that the ECM uses vacuum to test could lead you to miss the mark.

Handling EVAP DTCs related to component issues is also relatively straight forward. It’s locating the source of the “small leak detected” that can cause you to pull your hair out. In this edition of the Trainer, we’ll cover tips and techniques to help you quickly handle a variety of EVAP abnormalities, with a focus on finding those pesky leaks!

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