I think I would scan everthing on the PT Bus this may help to point you in the right direction. See who's complaining about who.
Check for supply voltage to sensors on engine (PCM output) - Is PCM beaving?
Start signal from PCM missing? Scope the PT Bus and unplug modules see if the signal cleans up.
Is the IC the gateway on this car? I don't know.
What scantool are you using?
The Fiat tech website is free to use but you have to download a program for it to operate - a bit painful to set up but great once its up and running.
Simon
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