Evaporative Emissions System: Description and Operation

Evaporative Emissions System
The vapor pressure sensor, Vacuum Switching Valve (VSV) for canister closed valve (CCV) and VSV for 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 are recorded by the ECM when evaporative emissions leak from the components, or when the vapor pressure sensor malfunctions.