Canister Purge Control Valve: Description and Operation

Purge Valve

The purge valve is installed on the inlet manifold chamber, next to the throttle body, and connected to the EVAP canister by a vent pipe installed on the underside of the vehicle, next to the fuel delivery pipe.

The purge valve is controlled by the Engine Control Module (ECM) and remains closed below a preset coolant temperature and engine speed, to protect engine tune and catalytic converter performance. When engine operating conditions are suitable, the ECM opens the purge valve and the depression in the inlet manifold draws fuel vapor from the EVAP canister.