C 2500 3/4 Ton Pickup 2WD L6-250 4.1L VIN D 2-bbl (1984)
Absolute Pressure Sensor: Description and Operation
The barometric pressure sensor senses changes in barometric pressure and provides this information, through an electrical signal, to the ECM. The
sensor produces a voltage signal of 3.5 - 4 volts to indicate barometric pressure. The voltage increases in proportion to increases in altitude (decreases in
barometric pressure). This sensor is normally used with the MAP sensor.