DTC P0191-00: Fuel Rail Pressure Sensor 'A' Circuit Range Performance: General Description

The Low Pressure Pump (LPP) supplies 65 psi (4.5 bar) of fuel pressure to the High Pressure Pump (HPP).

Using the internally located Fuel Pressure Regulator Valve (FPR), the HPP will boost the fuel pressure to 580 psi (40 bar) at idle to a maximum of 1958 psi (135 bar).

The Rail Pressure Sensor confirms the fuel pressure and returns the signal to the Powertrain Control Module (PCM).

Fuel pressure during limp-home mode is 65 psi (4.5 bar).