Well, the problem is resolved.
I didn't do any more diagnosis, except to confirm PCM continutiy to pin 85, and switched voltage at the PCM when the key is in the "start" position. I found these pins (and learned about the "start" pin) from the haynes manual, but had to find the specific pins by wire color. No fun with 80 wires in the harness.
Oh, I ordered both Haynes and Chilton manuals. They're the same books. First time I've seen that. Big disappointment.
I ordered a rebuilt PCM from "all computer rebuilders". I'd considered ordering from "solo", but went with the other guys.
...and imagine my surprise: The UPS labels said "solo". Maybe the same company? Maybe they have a reciprocal arrangement when one is out of stock? I seem to remember the ACR guy saying something about stock levels and an "alternate source".
I gave ACR my VIN, mileage and $295. I received:
- The PCM compatible with flex-fuel vehicles (E85 sticker in the fuel door)
- A mounting plate installed onto the PCM
- A "warranty void if removed" sticker preventing me from looking at the PCM innards I've photographed for this thread
- A shipping label for the return of my old PCM
The van fired right up, and has been working great. No check engine light, and no problems so far.
I have not tried pulling codes, and I'm due for the state inspection before the end of this month.