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That's not what this link says.
Your going to have to do some pinpoint tests, with a labscope preferably. If you have crank sensor signal at pins 21 and 22 coming into the PCM and no pulse coming back out from pins # XXXXX and 78 You have a PCM problem. If you've already changed the PCM then you need to look at it's grounds. They could be anywhere. Start at the battery and look over the entire car for a ground missing or bad. This could be anywhere on the car.
You should have grounds on pins # XXXXX and 77
How do you know that so fast? How did you test it?
You need to look closer. Your dismissing you last option.