Evaporative Emissions System: Description and Operation

The Evaporative Emission System:
^ prevents hydro carbon emissions from reaching the atmosphere.
^ stores fuel vapors in the Evaporative Emissions Canister (EVAP canister).
^ returns the stored fuel vapors to the engine during engine operation.
^ has an evaporative emission test port for test purposes.

The fuel vapors are routed:
^ from the fuel tank through the fuel vapor vent valves.
^ to the Evaporative Emissions Canister (EVAP canister) through a vapor line.
^ to the engine when the evaporative emission canister purge valve (EVAP canister purge valve) is opened by the Powertrain Control Module (PCM)).

The Fuel Tank Pressure sensor:
^ monitors the pressure levels in the fuel tank.
^ communicates the pressure reading to the PCM during the OBD II leak test.

The Evaporative Emissions Canister:
^ is Located Under The hood on the left inner fender.
^ contains activated carbon.
^ stores fuel vapors.

The Fuel Tank Filler Cap:
^ relieves system pressure above 14 kPa (2 psi).
^ relieves system vacuum below 3.8 kPa (0.55 psi).

The Canister Vent Solenoid:
^ seals the evaporative emissions system for the OBD II leak test.
^ is mounted to the evaporative emissions canister.
^ is serviced as a separate item.

The Evaporative Emission Canister Purge Valve:
^ regulates the purging of the evaporative emissions canister.
^ is controlled by the powertrain control module.

The evaporative emissions system is controlled and monitored by the Powertrain Control Module (PCM).