Barometric Pressure Sensor: Description and Operation

PURPOSE/OPERATION
The barometric pressure sensor converts the barometric pressure to voltage, and inputs that voltage (as signals) to the engine control module. The engine control module uses these signals to correct the amount of fuel injection.
5 Volt power from the engine control module is supplied to the barometric pressure sensor. It passes through the circuitry within the sensor and is grounded at the engine control module.
The barometric pressure sensor output voltage is sent to the engine control module in proportion to the barometric pressure (absolute pressure).