Injector Control Pressure Regulator: Description and Operation

INJECTION CONTROL PRESSURE SYSTEM

Fuel injection pressure is controlled by the injection control pressure (ICP) system. The ICP system consists of the following:

- The ICP sensor is mounted in the right valve cover.
- Injection Pressure Regulator (IPR) valve located in the high-pressure pump.
- Powertrain Control Module
- High-pressured oil pump



INJECTION PRESSURE REGULATOR (IPR)

Injection Pressure Regulator (IPR):

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

An open circuit results in minimal oil pressure and a no-start situation. A short to ground in a circuit results in maximum oil pressure, limited by a mechanical pop-off valve to 27,580 kPa (4,000 psi).