Fuel Rail Pressure Sensor

The fuel rail pressure sensor is a dual analog sensor that provides two fuel rail pressure signals and a fuel rail temperature signal to the engine control module (ECM) and is located in the end of the fuel rail assembly. The ECM provides a 5 V reference voltage on the 5 V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on both the fuel rail pressure sensor and fuel rail pressure sensor 2 signal circuits. Fuel rail pressure sensor 2 signal circuit also supplies a unique signal that provides fuel rail temperature information. The ECM monitors the voltage on both of the fuel rail pressure sensor circuits and compares the values to determine if the sensors are accurate. The ECM also compares the values between the fuel rail temperature sensor and intake air temperature sensor during cold start to determine if the sensor is accurate.