how to tell if evap vent VALVE IS BAD on 2002 Hyundai Sonata

removed from canister but unable to get movement when battery applied

by in Deer Park, WA on March 28, 2014
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3 answers 3 comments
ANSWER by , March 29, 2014
I use a scanner and select 'functional test' from the evap menu....What code(s) did you have?
ANSWER by , March 28, 2014
Well if you are testing it correctly and it isn't working, the writing is on the wall. :-)
COMMENT by , March 28, 2014
Not sure if I am testing it correctly. I applied battery power to the terminals and nothing. I think I read somewhere that if you could blow through the tube without resistance, it was ok. I know that some valves need to have pressure applied to the vent to trigger the solenoid.
COMMENT by , March 28, 2014
That valve works on a vacuum system, no pressure assist needed for operation, where's your ground?
ANSWER by , March 28, 2014
Other bit of info to find out (I don't have Hyundai technical info handy) is , if it's a 12 volt or 5 volt signal. If you apply 12 volts and it's designed for a low voltage signal , then you will fry it right then.
COMMENT by , March 28, 2014
That's good information, it's 12v on this, computer grnd. Thanks Bro. Hope he didn't put 12v to the ground, ooops