I would first unplug the electrical connection from the idle control valve. If idle speed does not change, then I would plug it back in in such a way as to be able to measure the voltage across the pins. If it is 0 volts, then your control module may be inoperative - check the OVP and the fuse(s) on top.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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