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What is a FICM
The FICM is the unit in a diesel motor that controls the electrical impulses that open and close the fuel injectors. The FICM or Fuel Injection Control Module uses electrical impulses to actuate the pressure doors that allow the diesel fuel to flow to the cylinders. This system is set up this way because the diesel motor uses extremely high fuel pressure to fill the cylinders when the door is open and many systems would fail under such pressures.