Today I had my forester hooked up to a scan tool looking over the engine monitors and noticed that the PCV solenoid was OFF. Took it for a quick test drive and the solenoid only activated twice on a 10 minute drive. Each activation was for roughly ten seconds. I was unable to find the enabling criteria for the PCV solenoid on ProDemand, and have had no luck in my research on this topic. Any ideas? Is the PCV supposed to be always on?