Very easy wiring question
#2
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Are you sure about C1 pin 75? I checked my wiring diagrams for 98 and 99-02 and there's no power to that pin in either of them. But the simple answer to your question is NO, you don't ever need "accessory" power to the PCM. They're only ever hot in "run, bulb test, and start" depending on which circut your working with. Hope this helps.