1998 Dodge Van

3 things, 1. The sensor sometimes has problems with a plastic gear the output shaft drives. Wears.
2. The wiring from the sensor to the harness could have a problem.
3. The PCM may need to be reset. If you have an internal problem the PCM may not be working(rare). Disconnect battery. May help.
It is 50/50 on one and two. I have replaced hundreds. Ok

After the power center recieves power, most circuits are fused. There is a splice that sends grounds and reference voltage also. From this splice the wiring goes to a connector that runs down the floorOutside) and is sent to the transmission and rear end fuel system. So a 8 or 10 way connector was what was wrong with the fellow with a truck, or van last week. He found no continuity through that connector, pulled it apart, and it worked again after he plugged it in. A trouble spot. So first be sure the connector on the sensor has voltage, ground, ref. So it can work. After the fuses are found to be ok using a voltage tester or voltmeter set to 0-10 or 0-50 volts DC. The power center is where all the circuit fuses are. Under the hood.