Hi All,
My 99 Boxster 2.5L is unhappy and throws DTC P0446 ("Evaporative Emission System Vent Control").
I researched the issue for a while and decide to take a look at the Evap system by the tank filler neck.
Here is what I found out so far:
The valve attached to the carbon canister seems to be working, I removed the valve and applied 12V and Ground to the two leads. The valve actuates and closes the plunger/diaphragm. Are there any other things I should check?
I also removed the other valve which was attached to the filler neck (see below).
When I blow in the red part (green arrow), the air flow is blocked. Once I push in the black plastic piece (yellow arrow) air can flow through the valve from green to green arrow. I assume that is correct behavior.
While I was on it I also removed the carbon canister. I can blow air through the hose (from green to green arrow) so it doesn't seem like there is blockage in there either...
How can I debug the actual carbon canister?
All of the other hoses are attached to the vehicle and lead to and from the tank I presume...?
What else can I do to debug the fault? I'm kind of running out of ideas....
Any help is appreciated at this point!