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do you have 5v at pin 29 of the pcm c2 connector, orange wire?
IF you have 5v there, than you will have to start tearing open the harness and find a broken or rotten wire. it will be a bit time consuming but its the only way to find it.
IF the 5v is not present, than you either have a dead short to ground or a pcm problem.
A dead shorted sensor can cut the 5v for every other sensor on the same circuit. you will have to disconnect every sensor on that same circuit untill the 5v returns. A shorted sensor can also short out the pcm and cause no communication too. It usually stores a code though.
If its not a short than you will have to double check every every 12v feed and ground, ive been caught a few times by missing one.
check the 5v ref right at the pcm first. if you need wiring diagrams, let me know