6.7L Power Stroke – Barometric Pressure (BARO)

The BARO sensor is internal to the PCM.
The PCM supplies a 5 volt reference signal (VREF) which the BARO sensor uses to produce a linear analog voltage that indicates pressure.
The PCM uses the BARO sensor to determine atmospheric pressure for fuel control, timing, and turbocharger control.
IDS: BARO (volts) and BARO (pressure)