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916S14
09-18-2007, 09:40 PM
Hey guys, i have a 96 240sx that i need to smog, but i have check engine light on. I scanned the codes and i got a P0446 and gave me this long sentence "Evap emission control system vent circuit malfunction" I searched this forum for other evap related posts, i found some but none of them got any strong replies on how to fix it. I'm thinking about changing the evap lines, and maybe see if that works. Any ideas? thanks guys.
916S14
09-18-2007, 11:10 PM
Is there a master mechanic in the house...? Anyone...?
MURPHY
09-18-2007, 11:18 PM
word

vent circuit should be your purge valve or something along that. search for that should deff be a pic of where it is/how to fix

something evap is not doing it's job. and evap = evapporative emmision control system so you know the 1st part. vent circuit should be like i said the purge valve tho.
916S14
09-18-2007, 11:51 PM
Ok so i think i know what it is now, the evap vent control valve. Isnt that under the gas tank somewhere around that area? I have no flashlight right now so i cant check it =(.
916S14
09-19-2007, 12:55 AM
well for anyone else that may have this problem, its the evap vent control thingie. its bolted right up to the evap canister by the fuel tank. Take it out and hook it up to the battery, simple plus and minus connection. you should hear it click, thats the silenoid opening, if not, you need a new one. Thanks.
RedtopTech
09-21-2007, 07:02 PM
other than checking for the clicking sound you need to apply vacuum to the valve and make sure it doesnt leak down. Then when voltage is applied, the vacuum should drop instantly. Other than that, check the lines going to and from the valve. Any leak will also set a code.
kouki_018
10-05-2009, 09:59 PM
i have the same code and i applied power to the valve and it's working. i erased the code couple times but now i can't even erase the code anybody would know what should i do next??
projectRDM
10-06-2009, 08:49 AM
i have the same code and i applied power to the valve and it's working. i erased the code couple times but now i can't even erase the code anybody would know what should i do next??

Fix the problem maybe?

The FSM has a full and thorough diagnostic procedure for every code. Look it up instead of bumping two year old threads.