Circuit Description
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
The vapor pressure sensor (VPS) and the VSV for the canister closed valve (CCV) are used to detect abnormalities in the EVAP emission control system. The ECM decides whether there is an abnormality in the EVAP emission control system, based on the vapor pressure sensor signal.