Actuators

Link to 6.0L Bible

Actuators convert electrical output from the PCM to hydraulic, mechanical or electronic work.
The 6.0 Power Stroke uses three actuators: Injection Pressure Regulator, Exhaust Gas Recirculation Valve and Variable Geometry Turbo Control Valve.
Injection Pressure Regulator is a duty cycle controlled valve that the PCM uses to control the Injection Control Pressure (ICP).
Exhaust Gas Recirculation Valve is used to mix cooled exhaust gasses with intake air to lower emissions.
Variable Geometry Turbo Control Valve is a duty cycle valve that directs oil flow to the piston that controls the vanes in the turbocharger.