Circuit Function
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
The variable geometry turbo (VGT) actuator is a variable position valve that controls vane position in the turbine housing. The VGT is located on top of the turbocharger. The valve position is controlled by switching voltage source inside of the PCM.