Evaporative Emission Control System (Excluding Charcoal Canister)

The evaporative emission control system is designed to prevent fuel vapor from escaping into the atmosphere.

If the fuel vapor vent line openings are blocked or damaged, fuel vapor will escape into the atmosphere.

Disconnect the line at both ends and blow it out thoroughly with compressed air.

Remove the fuel filler cap from the filler neck and check that the seal is not separated from the filler neck.

Check that the overfill limiter (2-way valve) installed in the vapor line between the charcoal canister inlet and the fuel tank outlet operates properly.

Charcoal Canister

When the engine is off, fuel vapor generated inside the fuel tank is absorbed and held in the canister. When the engine is running, fuel vapor stored in the canister is drawn into the intake system through the purge control solenoid valve.

Purge Control Solenoid Valve

The ECM (Engine Control Module) controls the purge control solenoid valve. When the engine coolant temperature is low and the engine is idling, it closes so that evaporated fuel does not enter the intake manifold. After the engine warms up, during normal driving, it opens so that evaporated fuel is drawn into the intake manifold.