626 L4-2184cc 2.2L SOHC F2 (1989)
Evaporative Check Valve: Description and Operation
Evaporative Emission Control System (EVAP)
This system stores fuel vapor generated by the fuel tank in the canister when the engine is not running. The fuel vapor is stored in the canister until it
is drawn into the combustion chamber and burned when the engine is started.
The components that make up the evaporative emission control system are the: air flow meter, charcoal canister, check and cut valve, engine control
unit, ignition coil, fuel/vapor separator, purge control solenoid valve, three-way check valve, vacuum switching valve, coolant temperature sensor, and a
thermo-vacuum valve.
CHARCOAL CANISTER
The charcoal canister stores gasoline vapors when the engine is not running.
CHECK AND CUT VALVE
The check and cut valve releases excessive pressure or vacuum in the fuel system and vents it to/from the atmosphere.
ENGINE CONTROL UNIT
The engine control unit detects signals from input sensors and switches and controls the purge control solenoid valve.
FUEL/VAPOR SEPARATOR
The fuel/vapor separator prevents liquid fuel from entering the charcoal canister.
PURGE CONTROL SOLENOID VALVE
The purge control solenoid valve is used to control the vacuum signal to the vacuum switch valve.
THREE WAY CHECK VALVE
The three way check valve controls pressure in the fuel tank.
VACUUM SWITCH VALVE
The vacuum switch valve regulates the flow of evaporative fumes from the charcoal canister to the intake manifold.
THERMO-VACUUM VALVE
The thermo-vacuum valve controls the vacuum applied to the No. 1 purge control valve and solenoid valve (Purge). The valve opens the vacuum
passage at temperatures above 54°C (129°F).
