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Try swapping the automatic shutdown relay with another one in the fuse box. Other than that, you seem to have pretty much covered all your bases regarding that code that I am aware of, unless the coil you changed wasn't the #1 coil?
let me know if this helps you. Thank you.
DIAGNOSTIC FLOW CHART
Was this what you were looking for? If not please let me know so I can help you. Thank you.
Did you follow the steps in that flow chart above? what step did you get to?
Ok. I have quite a few things to do today so I will be in and out.
How did it go?
The gray wire is the ignition coil driver circuit. Did you measure the resistance on that wire from the PCM connector to the coil connector?
When you disconnect the connectors at the #1 coil and at the pcm, if you checked the resistance on the gray wire between the connectors and it was less than 5 ohms, and you checked the gray wire to ground resistance and have more than 5 ohms then you likely have gotten a bad PCM. If there is ANY question at all as to the integrity of that wire, I would bypass it and see if the problem resolves. Check the connectors very good as well.