It's E-side processor...but it's pin 46 on the MCU, which is Port E bit 5, AN5, and as best we could tell it was unused, I thought? I don't even think the factory bins did anything with it at all? It's been a few months, I had to go back and pull the cover off the ECM to take another look. EDIT: It appears it was grounded in the OE configuration, which would tell me it's unused. I lifted the pin, used a 10K isolation resistor and a 470K pullup resistor, and tied it to pin C7, all completely off the board. I can use a different pin, but this one was the easiest one to lift and repurpose, so that's why I chose it.
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