What is the Carbon Canister Purge Valve

The carbon canister stores fuel vapours until the CFSV is actuated by MEMS. CFSV activation occurs when the engine temperature is above 70°C, the engine speed above 1500 rpm and the MAP sensor returns less than 30 kPa.

When the CFSV is actuated by MEMS, the valve is modulated on and off, and fuel vapours are drawn into the inlet manifold to be burnt by the engine during normal combustion. So that engine performance will not be affected, the CFSV remains closed during cold engine operation and also during engine idle.