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Ron, mostly incorrect info so far!!!
The idle control valve on that model & year, is controlled 100% by the fuel computer.
To measure the circuit you need a meter capable of measuring duty cycle.
IF you disconnect the idle valve the computer stops sending that signal to the valve.
You never posted what is WRONG with the car that you want to test the circuit?
IF you have a meter with duty cycle capabilities, ??
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The problem I am dealing with is a very very hard to start car when it is cold.
I do not have a meter with duty cycle capabilities, so does that mean I will be unable to diagnosis?
Which black box is the fuel computer? The one with three rows of connectors, the one with two rows of connectors or the MAS relay. I have a spare parts car, same year so I can swap them to see it that helps.