Sensor-Fuel Pressure: Operation
WARNING: This page is about a different car, the 2006 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The fuel rail pressure sensor measures the current fuel rail pressure and supplies an appropriate voltage signal to the Engine Control Module (ECM). A fuel pressure solenoid is then actuated by the ECM through a control loop until the desired rail pressure is reached.