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Hi there. Welcome to our site!
I myself cuss and swear at every vehicle I work on - no specific reason, just because it feels good :-)
Now, to the matter at hand; going by the symptoms you describe, the PATS is active. This can be caused by a damaged key, a non-encoded key, bad wiring or bad PATS module.
Being as it is an anti-theft system, it cannot be defeated or bypassed using regular methods. Any trouble codes in the system's memory can only be retrieved by an NGS tester or similar scan tool.
Obviously, the first thing to try would be a working spare key. Do you have one available?
I hear you, Brother. I'm just not sure you're hearing me: you need a NGS tester to communicate with the PATS module to retrieve any codes and see what the real issue is. PATS has nothing to do with OBDII, so Ford is not obligated to make PATS codes or data generic - OBDII generic codes and data are the ones you can get with just about any good code reader.
By what you just posted, PATS is preventing the PCM from pulsing the injectors open - if you were to plug in a Noid light into any injector connector, you would see it would not flash as the engine was being cranked by the starter.
Licensed locksmiths usually have access to special scan tools that focus on anti-theft/lock systems. Know one of those that could you ask for help?
Well, I think I can clarify things a little but better for you:
Ford states this to describe PATS:
"During each starting sequence, the encoded ignition key is interrogated by vehicle anti-theft electronics. If the key's identification code matches code programmed into anti-theft system, vehicle is capable of starting. If key's identification code is incorrect or missing, vehicle is prevented from starting."
Since PATS uses the PCM to prevent the engine from starting, and the PCM is not part of the Starting Circuit, you can safely say PATS is the cause for the no-start on that Expedition you've been working on. Furthermore, there is no associated procedure that could cause PATS activation other than disconnecting the battery.
Unless you purposedly damaged the key or messed with the wiring, I got to say you are not a fault here, Brother.
Going by what you have posted, I can't see where a PCM would be needed. What makes you say that? Did you do something that could have damaged the PCM? Am I missing something (a senior moment perhaps ;-)?
At the same time, I can't say for sure a simple reprogramming of the PATS system by the dealer is going to fix the issue. Once again, am I missing something here?
Well, my friend, in my role as a verified expert on this site, I have tried to give you not only the advise you were looking for when you posted your request, but any additional information from the manufacturer that would seem related to this issue. Other than that, I don't know what it is that you expect from me.
What would be your technical explanation for needing the PCM re-programmed?