the ICV is down below the inlet manifold as im sure you know, just disconnect the wiring plug and undo the jubilee clips from the pipes, then get the icv out and in the hole where it is inline with the icv (not the one sticking up from it) i use a flat blade screwdriver (wiggle it around inside it and you'll find it) to prise open the valve so you can spray carb cleaner inside it, some people say to connect it upto a battery to keep the valve open. also once you've got all the crap out of it with carb cleaner some people say to oil it up, and some people dont oil it up. personally i dont oil it up. hope thats of some help
If you're not sure where it is, standing in front of the car, look at the right hand side of the SFi box. A hose comes off here and goes right down to the ICV. It is only supported by 2 hoses and is quite heavy for it's size. About 7" long and a cylindrical shape.
The first time I took mine off, I had to do it from underneath because of the position of the screw slots on the jubilee clips.
I suggest you undo the battery first to avoid making any connections with other electrical items if you're waving a screw driver about and you're not sure what you're looking for.
The electrical connector won't just pull off - there's a spring clip to release before it will - obvious when you look at it - not so obvious when you do it by feel.
When you put it back on make sure you line up the jubilee clips so you can undo them standing up looking from the passenger side of the SFi box. Makes it easier next time. Make sure it is lying horizontal as well, not tilted one way or the other although the electrical connector and hoses will "force" this to some extent
Spray fuel injection/carb cleaner in the valve and swish it round till it comes out without any black muck.
I lube mine after with HT Silicon grease and it usually behaves well for 2-3 months. Others use 3 in 1 oil and others use nothing.