Circuit Description
WARNING: This page is about a different car, the 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
The vapor pressure sensor, the VSV for the Canister Closed Valve (CCV) and the VSV for the pressure switching valve are used to detect abnormalities in the evaporative emission control system. The ECM decides whether or not there is an abnormality in the evaporative emission control system by the vapor pressure sensor signal. DTCs P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunctions.