eugenez,
Where you able to resolve this problem, if so could you tell us what you replaced and the part number. I'm having the exact code pop-up on my 2000 ES too. Back in April thats when i got the first P0440 error code. I've reseted the code and it didn't came back until 4 months later. I purchase a new OEM gas cap and tried to look for vacuum leaks, but did not find any. So until now i'm still having this MIL light on with the TRAC off. I did attempt to remove the charcoal canister, but i back out on removing it because i did not want to damage any vacuum hoses without no replacement. I've also check the functionality of the 3 VSV by connecting a 9V battery with alligator clips, all 3 VSV have a clicking noise so it should be good. I'm close to buying a new charcoal canister but still waiting around if anybody have a definitive fix for this problem. I've checked a local mechanic and ask them how much they would charge to troubleshoot my car and they told me it would cost $180, so with that price i rather put that money towards a new canister.