Q&A

 Master

You will need to determine the problem with the evaporative system. It may be a bad valve, hose or an electrical issue, so it's hard to estimate the repair, but you are probably looking at 1 hour of diagnosis time to diagnose it.

 Rookie

When looking for help for another problem, I found directions with pictures at Steampunkworkshop. com by a Jake von Statt - really good detail, reasons, etc. to examine and repair evaporative cannister (PO446.) Hope this is some help - this person said repair would cost $750 at shop. His only cost was for the dianogic tool doing it himself.

 Journeyman

dear,friend, may be you can buy a DIY tool to test, I know it call toyota it2, because I test my car using this tool, it is cheap.
you can visit here
http://www.chinasinoy.com/wholesale/toyota-intelligent-te...
hoping can help you.