Section 03-04D: Fuel Charging and Controls, 7.3L Diesel Engine | 1996 F-250, F-350 and F-Super Duty Workshop Manual |
Fuel injection pressure is controlled by the injection control pressure (ICP) system. The ICP system consists of the injection control pressure (ICP) sensor (located in the cylinder head oil gallery), the injection pressure regulator (IPR) (located in the high-pressure oil pump), and the powertrain control module (PCM) (12A650).
The powertrain control module interprets what is required for optimum engine performance based on sensor input. The ICP sensor tells the powertrain control module what the oil rail pressure is. If the powertrain control module determines that the fuel demand needs to be increased, the powertrain control module tells the injection pressure regulator (IPR) to increase oil flow and pressure to the fuel injectors (9F593).