General Information

Engine Control
P0191 Fuel Rail Pressure Sensor Circuit Range/Performance - General Information

Component Location





General Description

Fuel rail pressure sensor is mounted to fuel rail and it senses fuel rail pressure.
GDI ECM operates fuel pressure control valve with the signal from fuel rail pressure sensor to control optimized RPM and rail pressure.

DTC Description

ECM shows P0191 when the average value from fuel rail pressure sensor is out of range of threshold value. This code is for abnormal sensor.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data




Fig.1) Normal waveform of FPS at acceleration.