That is an image of a Subaru EJ253 with a white component off of the upper air intake plenum. The component in question has a red box digitally drawn around it.
What is that component?
Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. It only takes a minute to sign up.Sign up to join this community
It the PCV Diagnosis Connector (E51). It routes to D12 on the ECU, and the other side is grounded.
It's a sensor of sorts, not a solenoid or valve. It's really nothing but a mechanical "switch" that shorts when the hose is connected. If you disconnect the hose, it opens and causes the ECU to generate a proprietary Subaru P1xxx DTC:
DTC P1491 POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEM
You can monitor it in ROMRAIDER. It's always "1" or "ON" ... unless you disconnect the hose. It tells absolutely nothing about the PCV valve function, pressure, flow, leaks, or if the other end of the hose is disconnected.
It's really rather silly I suppose. Nothing to worry about unless you're putting in a Perrin turbo kit or something that deletes the stock PCV system. In that case you simply short the two wires in the connector, or permanently ground D12 at the ECU. Or disable P1491 with ROMRAIDER. (All off-road use, of course...)