RPS(Rail Pressure Sensor), consists of piezzo electric element, measures rail pressure inside of common rail.

ECM determines optimum fuel injection quantity at specific engine condition based on RPS signal. RPS signal is also used as rail pressure regualtor feed back signal in order to achieve optimum rail pressure at certain engine condition.

1. Connector

2. Measurement circuit

3. Sensor element(diaphragm)

4. Rail pressure

5. Fuel rail