Sensor, Oil Pressure: Operation: Operation
WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
The engine oil pressure sensor receives a 5- volt. Reference from the PCM. The sensor ground is also provided by the PCM. The sensor output voltage varies from 0.5 to 4.5 volts depending on engine oil pressure.