Evaporative Emissions System: Description and Operation

The evaporative emission system:
^ prevents hydrocarbon emissions from reaching the atmosphere.
^ stores fuel vapors in the Evaporative Emission (EVAP) canister.
^ returns the stored fuel vapors to the engine during engine operation.
^ has a remote evaporative emission test port located next to the fan shroud.

Fuel vapors are routed:
^ from the fuel tank through the two fuel vapor vent valves to the evaporative emission canister through a vapor line.
^ from there, to the engine when the evaporative emission canister purge valve is opened by the Powertrain Control Module (PCM).

The evaporative emission system is controlled and monitored by the PCM.