Circuit Description

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 there is an abnormality in the evaporative emission control system, based on the vapor pressure sensor signal. DTCs P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunctions.