My engine cranks but wont start?

Check all your fuses to see if one is bad. Also do the checks from the the crank no start test from the link I posted earlier and let us know what those results are.

Have you done the other checks from the link I posted. Checking for spark, fuel injection pulse? If you have none of those let us know. If it is an immobilizer fault the vehicle will run for a few seconds before the PCM cuts the injector pulse. If you have another key try it as well. What you are describing seems like you may have PCM fault but you need to verify you have fuel pressure, pulse to the injectors, and spark.

If you have all three then I would suspect a plugged catalytic converter. You can try removing a spark plug to see if pressure is relieved. But you would need to do those checks and see if something is missing from those test before we dive into the PCM.

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All of the coils are fed from the same fuse #12 in the central junction panel, behind left side of dash so make sure the fuse isn't blown.

Pin #12 of the DLc is the purple wire that goes to the pcm pin #13 connector C. Disconnect the plug from the pcm and check for on open/short and short to ground using an ohmmeter on that wire.

Also, when someone asks you to check a fuse, you should use a voltmeter or at least a 12 volt test light and check for power on both sides of the fuse when it is supposed to be hot, most of the time they are hot at all times and other times only with key on run, etc.
In this case of that coil #12 fuse, the key should be on run.

I would have to say yes, this appears to be a security issue.
No, the security system would not prevent the scanner from communicating with the PCM or other modules.
Check the continuity on that purple wire. You are going to have to read the security trouble codes too to find out what is wrong.
If you have a spare key though try that.
If not, clean that key you have where the pellet is and try again.
If the security light goes out finally after ten minutes of leaving the key on run, then you may be able to relearn the password.
You will need a scan tool and I see that the instructions mention something about the instrument cluster.
That is how to enter the "security access procedure".

Wow, that surprises me. I get an extra glass of sangria tonight for that magic trick.