As far as the FPU VSV, there are 3 tests you can perform on it. But good luck getting to it, its bolted to the second bolt (closest to the radiator) that holds the lower intake manifold to the head. You will probably have to pull the upper intake manifold to test the VSV.
If you do want to test it, you will need an ohmmeter. The first test consists of blowing into the pipe that is next to the air filter and verify that air comes out the other pipe, near the terminals. Then to check vacuum circuit continuity, you have to connect the VSV terminals directly to the battery (looking at the VSV, with the terminals on your left and the air filter on the right, + goes to the top terminal and - goes to the bottom.) and verify that air comes out the air filter when blowing into the pipe near the air filter.
The last 2 tests are pretty basic, just making sure there is no continuity between the terminals and the VSV body and measuring the resistance between the terminals of the VSV. Resistance should be 30-50 ohms.
Probably more information than you ever wanted to know about Vacuum Switching Valves!!
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