01 Ram won't start, need help!

66 Cuda is correct - the CPS is kinda a bugger to get to. At that point, and with the age of the truck, you might just want to replace it so you're not digging in there again anytime soon.

If you do want to test it, I think you'll need a multimeter so you can test the input voltage from the PCM as well as the return signal. You should be getting 5v from the PCM, but you'll need the FSM to tell you what the proper return signal from the sensor should be. But others on here might know more about that than me. It's possible it's just fouled by oil, too, or has been physically damaged. I think the 5.9 PCM should throw a code for a bad CPS, though. I guess it's possible it's not yet out of acceptable 'range', but still faulty enough to keep it from starting.

I couldn't get to mine from above - I had to take off the plastic inner wheel fender to get to mine.

Edit: full disclosure, I did mine on a 00' Dakota, but I believe in this regard they are pretty similar.