High Pressure Oil System
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2005 Ford RV Cutaway, 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
The 6.0L diesel fuel injectors are powered by lubricating oil which is pressurized by a high pressure pump in the engine valley. The pump output pressure ranges from 3,102 to 20,685 kPa (450 psi to 4,000 psi). Oil pressure is controlled by the PCM through the injection pressure regulator (IPR) valve. The PCM controls pressure in the oil rail by opening (relieving pressure) and closing (increasing pressure) the IPR valve. The high pressure oil is delivered to the oil rails in the cylinder heads. An injection control pressure (ICP) sensor mounted on the high pressure pump cover sends an analog voltage signal (0.5 to 5.0 volts) to the PCM for feedback control of the oil pressure.