Fuel Rail Pressure Sensor
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The fuel rail pressure sensor monitors the fuel pressure within the fuel rails and communicates this data to the ECM. The ECM uses fuel pressure data to adjust the PWM signal to the fuel pump actuator and fuel pressure relief valve to achieve the desired fuel pressure for optimum fuel injection.
 Courtesy of NISSAN NORTH AMERICA, INC.
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