I do not have a complete wiring diagram of such a car, but normaly ecm is controlled by minus signal (earth, ground). If the A/C pressure switch will ground that wire, you may do that manualy (by a switch) thus rpm could rise up these rpm`s you need even when engine is idling. Somebody mentioned this earlier in that thread.
"AHWZ",is that your memcal? what is XUZA?
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