The fuel pressure sensor contains supply, signal, and return pins. The electronic control module (ECM) provides 5 VDC to the fuel pressure sensor for a supply voltage. The ECM supplies a shared ground from the fuel pressure sensor circuit. The signal voltage is variable depending on the pressure that is being generated inside the fuel pump accumulator.
This 5 VDC power supply is a shared supply. Other sensors on this circuit include the engine speed sensor, engine position sensor, oil pressure sensor, intake manifold pressure sensor, and ambient air pressure sensor.
The shared ground for the fuel pressure sensor also connects to the injection control valve identifier, temperature sensor, intake manifold air temperature sensor, engine position sensor, oil pressure sensor, intake manifold pressure sensor, and ambient air pressure sensor.
The fuel pressure sensor is located on the top rear of the fuel pump. The pressure sensor can be identified by its mounting location, rear center of the CAPS accumulator module
Fuel pressure sensor stuck in range while engine is operating or fuel pressure sensor reading erratic in range.
Engine power derate; engine can run rough or die
This fault can be set due to: