Vacuum Switch Valve

Asked by GuruVJBQC Sep 23, 2018 at 12:08 AM about the 2003 Toyota ECHO 2 Dr STD Coupe

Question type: Maintenance & Repair

When testing the air flow for the Vacuum Switch Valve for EVAP,is it ok to do it manually by mouth, or do I need a certain piece of equipment?  Mine tested around 32 or 33 using the multi meter, which is within range according to my repair manual (although repair manual recommends testing at 68 degrees, but I tested at room temp, around 80 degrees).  There is no continuity between each terminal and the body.  However, when I hook it up to my car battery and blow into Port E to Port F, there is nothing.  I can hear (and feel) the click that some of the websites say should occur, but no air flow.  The manual does not specify how to test the air flow; it just says 'Check that air flows from port E to port F'.....I want to try to make certain I need another one before buying it.  

3 Answers
9,520

Mike answered 5 years ago

You can't pull a strong enough vacuum with your mouth you can probably do 1-2 in hg when the valve is looking for 2-19 in hg

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GuruVJBQC answered 5 years ago

Thank you for your reply. What tool would I use to create a strong enough vacuum to test it? And can you tell me if it's possible to hear the audible clicking sound when it's connected to the battery, but yet not be working properly?

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Mike answered 5 years ago

A hand held vacuum pump is usually used,and, yes it's very possible even common for the valve to come apart inside so while it may click doesn't mean the piston inside is moving.

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