Pin29 on the pcm is the 5 volt supply and its grounded, Is the pcm fried ?
I'm having mutiple.codes.for the sensor that read of off that 5v including cam and crank sensor reason van wont start.

 

I just fixed my van not starting issue, it was a corroded pin on the pcm that controls the ASD. I was able to start the van prior to this by pulling the ASD relay and jumping 12v to the ASD output circuit. Your issue maybe different but the PCM will close some circuits down after 1 second if the engine is off. Here's a quote from the manual:
"When the key is in the ON position and the engine is not running (zero rpm), the Auto Shutdown (ASD) and fuel pump relays de-energize after approximately 1 second. Therefore, battery voltage is not supplied to the fuel pump, ignition coil, fuel injectors and heated oxygen sensors.

ENGINE START-UP MODE
This is an OPEN LOOP mode. If the vehicle is in park or neutral, the ignition switch energizes the starter relay when the engine is not running. The following actions occur when the starter motor is engaged:

• If the PCM receives the camshaft position sensor and crankshaft position sensor signals, it energizes the Auto Shutdown (ASD) relay and fuel pump relay. If the PCM does not receive both signals within approximately one second, it will not energize the ASD relay and fuel pump relay. The ASD and fuel pump relays supply battery voltage to the fuel pump, fuel injectors, ignition coil, and heated oxygen sensors.
  
• The PCM energizes the injectors (on the 69°falling edge) for a calculated pulse width until it determines crankshaft position from the camshaft position sensor and crankshaft position sensor signals. The PCM determines crankshaft position within 1 engine revolution.
  
• After determining crankshaft position, the PCM begins energizing the injectors in sequence. It adjusts injector pulse width and controls injector synchronization by turning the individual ground paths to the injectors On and Off"