A Web search didn't reveal a clear meaning of: Intake Valve Control Solenoid. Sure, the words, themselves, reveal a little understanding; but, for me, not near enough.
This item is part of the engine design. It should be covered in the repair manuals, such as: Haynes, or Chilton's. If you understand what something is, and does, you can more easily understand the problem when the system doesn't perform as designed.
You can get the Subaru service manual, online, by googling: Subaru Technical Information System (STIS). It's cost a subscription price; but, what is good is not always free.