I got a P0446 code the other day. I looked thru the manual at the library and checked the VSV for pressure switching valve. The picture of the valve was different was different from the manual online at camrystuff.com. I uploaded a scan of it to http://tinyurl.com/4ax3p6.

step 2 says "using an ohmmeter, check that there is continuity between the terminals." At 20 C it should be 37-44 ohms. I check mine and it was 41.

step 3 says "Using an ohmmeter, check that there is no continuity between each terminal and the body." I checked and there was no continuity.

step 4A says "check that air does not flow from ports E to F". I blew into port E and felt air come out of port F. I didn't do step 4B or 4C.


Since it failed step 4A, would this be cause of the error code?
Do I have to buy this from the dealer? Thanks.

Yes, if there was no battery voltage applied across the terminals.

I believe it is a dealer only part, but you can find one easily at a salvage yard.

Also see the description in the FAQ thread:
http://www.automotiveforums.com/vbulletin/showpost.php?p=3203705&postcount=21

the vsv for the charcoal canister can be difficult to remove

I had the vsv replaced and I no longer got the code p0446