Subaru Forester Evap System Diagram. I have a 2004 impreza ts same as 99 04 forester that had the check engine light cel on for a p1443 evap control system vent control function problem. 10 to 30 minutesin trying to clear the p1443 error code i replaced the evaporator system charcoal canister in a 2001 subaru ou.
The reading reported an slight evaporation leak in the fuel system. Fuel level also seems to be important some manufacturers require. The research ive gather in the last couple days was that the evap system basically takes the fuel vapor from the gas tank and recycles it with the air going into the intake manifold.
The evap system captures all fuel vapors from the fuel tank and sends them to the engines intake manifold.
As you drive and conditions allow the engine computer pcm tests the evap system for leaks by monitoring pressure or vacuum inside the system. While technically an emissions system its not like a smog pump from back in the day. Evap purge control solenoid a failed evap purge solenoid in tank pump fuel engine oem subaru part 14774aa601. Typically the evap test is a series of tests run at different operating conditions and temperatures.