Evaporative Emission Control System

The evaporative emission control system prevents fuel vapors from escaping into the atmosphere.

Canister

Vapors produced by fuel evaporation in the fuel tank are collected in the canister while the engine is off. While the engine is running, the fuel vapors stored in the canister are drawn into the surge tank through the canister purge control solenoid valve.

Canister Purge Control Solenoid Valve (PCSV)

The canister purge control solenoid valve is controlled by the ECM. When engine coolant temperature is low and the engine is running at idle, the valve remains closed, so fuel vapors do not enter the intake manifold surge tank. After the engine has warmed up during normal driving, the valve opens, allowing fuel vapors to flow into the intake manifold surge tank.