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I read your previous post where you checked the fuel pump relay and had 12V on fuse 19 and on pin 30 but only had 6V on pin 87. What are you reading on the coil side of the relay on pin 86? Are you getting a good ground from the PCM on pin 85?
The coil side of the relay has to energize to create magnetic field to pull the switch side closed. I suspect that you are not getting enough juice here to do this. Also since when you jump pins 30 and 87 and get 12V to the pump and it still doesn't run confirms this. Pin 86 gets its power from the PCM relay and I suspect your problem is here and not at the fuel pump relay.
Here is the wiring schematic for this
Check power on pin 30 and 87 of the PCM relay see if you are not getting the same results there also. If so then jump pins 30 and 87 like you did on the fuel pump relay and see if it runs then. If it does then check the PCM diode I suspect that this is your problem.
Are you sure you are not battling a PATS problem? What is the anti-theft light doing when you turn the key to the run position?
No at the dealership we can only test the PCM on the vehicle.
On this vehicle it does not have a starter interrupt it disables the fuel pump.
If the anti-theft light is flashing rapidly when the key is turned to on position this is your problem.
Sorry I didn't put you there sooner but you fooled me with the 6V at the inertia switch.When you said you jumped the PCM relay and the fuel pump relay still would not energize I was saying oh s%#*#.
When you turn the key to on position the theft light should come on solid for about 2 seconds then turn off.
Here is a copy of the wiring schematic if you need it.