LOCATION AND CHANGE OUT OF VENT VALVE AND VAPOR CANISTER
Your best bet would be to obtain a small service manual ...Chiltons still prints them. They are available at just about every major autoparts store and run about $25 - $30 or so. You'd probably have to order it for your '03. Or look on Amazon. Another source for step by step "how to" is AutoZone's website. The beauty of the manuals are the pictures. They will show you where the vent valve is ...because there's a good chance it isn't on the canister. And the canister itself can be hidden away under some other piece of gear in the engine bay. A manual will also give you heads-up to any special considerations or procedures when doing the work. A picture's worth a thousand words but you could print a thousand words and still not paint the right picture. Get the book.
SOURCE: HAVE A TROUBLESHOOTING MESSAGE PO446
DTC P0446 Evaporative Emission (EVAP) Vent System Performance
The vehicle control module (VCM) monitors the performance of the evaporative
emission (EVAP) system by applying a predetermined level of vacuum to the
EVAP system and monitors the vacuum decay rate. The VCM sets this diagnostic
trouble code (DTC) if the vacuum decay rate is more than a predetermined
value. The VCM monitors the amount of vacuum and the amount of pressure
in the EVAP system by monitoring the fuel tank pressure sensor. For
this DTC, the VCM turns ON both the EVAP purge valve and the EVAP vent
valve when the Conditions for Running the DTC are met. This applies
an engine vacuum to a closed EVAP system. The VCM turns OFF both the
EVAP purge valve and the EVAP vent valve when the system reaches a correct
amount of vacuum. The EVAP system should quickly RELEASE the vacuum
in the EVAP system with the EVAP purge valve OFF and the EVAP vent valve
OFF (open). This test indicates a blocked or restricted EVAP vent path
if the EVAP system fails to release the vacuum quickly enough.
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