Updated my document a bit to clarify a little. I also added the actual circuit for analog AC request as I now know it. I was able to find the "destination" of the C2 pin 17. It goes a chip labelled "203 466", pin (I think) 8. Without a data sheet, which I could not find, I have no idea what the function of that chip is but it has the same foot print of the 11124 466 chip which is apparently a "datalink controller" at this PCM hacking link: https://www.thirdgen.org/forums/diy-...-101-step.html.
To sum up, if one were daring, one could populate the missing 3k and 100k resistors, find out the value of the missing capacitor, and replace the 10k resistor with the cap to restore ac request functionality to the pcm's without that capability.
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