Injector Control Pressure Regulator: Description and Operation

INJECTION PRESSURE REGULATOR











Fuel injection pressure is controlled by the Injection Control Pressure (ICP) system. The ICP system consists of:
^ injection control pressure (ICP) sensor (located in the cylinder head oil gallery)
^ Injection Pressure Regulator (IPR) located in the high-pressure oil pump
^ powertrain control module

The Injection Pressure Regulator controls injection oil pressure. An electrical signal to a solenoid creates a magnetic field which applies a variable force on a valve servo to control pressure. The quantity of fuel delivered to the combustion chamber is proportional to injection control pressure.

An open circuit will result in minimum oil pressure and a no-start situation. A short circuit results in maximum oil pressure, and is limited by a mechanical pop-off valve to 27,580 kPa (4000 psi).