Theory Of Operation
WARNING: This page is about a different car, the 2016 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) provides a 5 Volt supply to the Oil Pressure Sensor on the sensor supply circuit. The PCM also provides a ground on the sensor return circuit. The Oil Pressure Sensor provides a signal to the PCM on the Oil Pressure Sensor Signal circuit.