Fuel Rail Pressure Sensor

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Fuel Rail Pressure Sensor - one signal analog

The fuel rail pressure sensor is a single analog sensor that provides a fuel rail pressure 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. When the fuel pressure is high, the fuel rail pressure sensor signal voltage is high. When the fuel pressure is low, the fuel rail pressure sensor signal voltage is low.

Fuel Rail Pressure Sensor - Dual signal analog

The fuel rail pressure sensor is a dual analog sensor that provides two fuel rail pressure signals 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. 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. When the fuel pressure is high, the fuel rail pressure sensor signal voltage is high and the fuel rail pressure sensor 2 signal voltage is low. When the fuel pressure is low, the fuel rail pressure sensor signal voltage is low and the fuel rail pressure sensor 2 signal voltage is high.