Automotive Repair: Diagnosing EVAP Systems, The Trainer, June 2011

http://workshop.search-autoparts.com Diagnosing "Check Engine" light complaints is a common task for most shops. And a leading cause of an illuminated MIL (Malfunction Indicator Lamp) is a fault in the evaporative emissions system.

The primary function of the evaporative emissions system (also called the EVAP system) is to prevent fuel vapors in the tank from being released to the atmosphere. Instead, the vapors are collected in an activated charcoal storage tank, or canister. The ECM controls the purge of the canister by opening or closing a solenoid valve connecting the canister to the intake manifold of the engine, and allows the stored vapors to be fed and burned in the engine.

The EVAP system is tested by the ECM to make sure all the components function as they are supposed to, and checks the system for leaks to the atmosphere. A pair of EVAP related codes on Pete's 2007 Toyota, and how he approached their diagnosis, is the topic of June's "The Trainer".

Category:

Autos & Vehicles

Tags:

• automotive repair video
• car service tips
• diagnosing check engine light
• fixing evap system

[MotorAgeMagazine]

@Goodwrench496

I own both, and have been very satisfied with the capabilities of the AutoEnginuity program. And I LOVE my Pico scope!

[Goodwrench496]

Hey Pete, how do you like the AutoEnginuity scan tool.Does it do bi-directional controls, will it work on ford,gm,dodge and chysler products ?I looked at a verus just because it has a scope also.I read an article where some one had this to say ( Extremely disappointing for the money! ) about the verus.Have you used a pico scope and if so did you like it or not.I'm having a tough time on trying to decide on what to buy.I worked for a chevy dealer before,we had a Tech 2 there.good for GM cars.