Evaporative Emissions System: Description and Operation

EVAP System:

PURPOSE
System prevents fuel vapors from being discharged into the atmosphere. Under specified conditions, stored vapors are routed into the intake system and burned.

OPERATION
The purge solenoid valve is controlled by duty signals from the PCME. Vapors stored in the charcoal canister are purged into the intake system when these conditions are met:
^ Engine at operating temperature.
^ Vehicle being driven in gear.
^ Accelerator pedal depressed (idle switch OFF).
^ Oxygen sensor functioning properly.

CONSTRUCTION
System consists of fuel vapor valve, two-way check valve, charcoal canister, purge solenoid valve, necessary hoses, input devices and the PCME.