2000 7.3 E450 crank no start

[bigfords]

Alright guys, looking for a little help here if somebody has had this experience.
I've got a 2000 7.3 E450 at work that I'm working on and kind of stumped. Heres the deal:
Crank no start. No "Wait to Start" light. All fuses are good. Relays are good. PCM power diode is good. Glow plug relay has power at the battery feed, and both small terminals as it should, but does not come on at all (PCM is not commanding it on) All power and grounds at the PCM are good.
Scanner will not communicate with the PCM, but communicates with other modules. Communication circuits to the PCM are good for the Datalink connector.

I thought I narrowed it down to the PCM, so they got me NAPA PCM. I put it in today and still nothing!

Any ideas? I know statistically it is super unlikely, but is my NAPA PCM junk?

 

[ToMang07]

Check your fuses. I bet your fuel bowl heater is out and blew the fuse. If it was the fuse, unplug the fuel bowl heater, install new fuse, and try again.

 

[bigfords]

Fuses are all good and I have good power at the PCM. I just got some input that maybe one of the sensors on the VREF are shorted causing no communication from the PCM. I'm going to try unplugging them tomorrow and see what happens- ICP, EBP, APP, MAP, BARO.