Here is the pin out for the PCM. Note that it is looking at the wire side of the connector, buttons on top.
Pin 103 is the 5V reference voltage for the input shaft sensor.
Pin 57 is the return ground from the input shaft sensor.
The easiest way to check these is to probe for 5V on pin 2 of the sensor harness with it unplugged and key on. If you have 5V, you know you are good there. If you don't, then proceed to check voltage at the PCM and if you have it, check your wiring (if you don't, the PCM is kaput).
Pin 53 should have ground, checked at pin 1 of the sensor harness unplugged. If you do, then all is fine. If there is no ground, check at the PCM pin 53. If ground is fine, then check your wiring. If there is no ground, the PCM is kaput.
If you have an oscilloscope, the preferred test would be to probe between 1 and 2 of the sensor with it plugged in or 53 and 103 of the PCM with the sensor plugged in. With the transmission in 3rd gear and the engine at 2000 rpm you should see a clean 5V squarewave. If it is less than ~4.2V or so, there is a problem. If the squarewave is jagged or inconsistent, there is a problem.