Barometric Pressure Sensor (7.3L DI Turbo Diesel Only)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 Lincoln Navigator, 2002 Ford Expedition, 2001 Lincoln Navigator, 2001 Ford RV Cutaway, and 2001 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
PCM uses signal from Barometric Pressure (BARO) sensor to determine altitude at which vehicle is operating. PCM then adjusts Electronic Pressure Control (EPC) pressure and shift scheduling to altitude.