Fuel Pressure Control Valve
The PCM controls the fuel rail pressure by activating the fuel pressure control valve which regulates the fuel pressure in the fuel rails. For additional information, refer to FUEL SYSTEM , FUEL PUMP SYSTEM in this service information. The PCM regulates fuel rail pressure by controlling the duty cycle of the fuel pressure control valve solenoid. An increase or decrease in the duty cycle maintains pressure in the fuel system or vents pressure to the fuel cooler. A high duty cycle indicates a high fuel rail pressure is being commanded. A low duty cycle indicates less pressure is being commanded. The fuel pressure control valve is mounted on the fuel rail.