The idle control valve is easy to check for the solenoid function. Just hook up two jumper leads from the battery and touch them to the two prongs on the ICU. If it clicks it works. But, it doesn't tell you if its sealing or not unless you hook a vacuum source to it. You could use low positive pressure instead. It's just a soenoid actuated on/off valve I tested on the bench. Hooked up a handheld minivac to it (with duck tape of course) and powered from a lawn mower battery.

Dave