Bad sensor or stuck valve in the CP3 pump.
I don't have time now to go through the FSM, but if you have a friend with a CRD, measure the Ohm value of the sensor with the engine shut off after sitting for a few hours or crack a line to an injector and let it drop to zero pressure. If the CRD you are looking at does not agree with the Ohms of the one that is good, you have a junk Rail Pressure Sensor. If they are the same suspect the CP3 has a problem.
Bone Yards can be a good source of parts.
Too bad we can't use some of our Elected Officials for spare parts when they are wrecked (Elected)
