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

removed from canister but unable to get movement when battery applied

Asked by for the 2002 Hyundai Sonata
I use a scanner and select 'functional test' from the evap menu....What code(s) did you have?
3 answers 3 comments
Well if you are testing it correctly and it isn't working, the writing is on the wall. :-)
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.
That valve works on a vacuum system, no pressure assist needed for operation, where's your ground?
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.
That's good information, it's 12v on this, computer grnd. Thanks Bro. Hope he didn't put 12v to the ground, ooops