Barometric Pressure Sensor: Description and Operation

PURPOSE
The Barometric pressure sensor is a Semiconductor type unit which sends information to the ECM regarding the pressure altitude of the vehicle, which is used in computing fuel injector duration.

OPERATION
The barometric pressure sensor functions to convert the barometric pressure to voltage, and to input that voltage (as signals) to the engine control module. The engine control module based upon those signals, then corrects the amount of fuel injection, etc.. The 5 V power supply within 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 supplied to the engine control module in proportion to the barometric pressure; as the pressure drops, so does the output voltage.

CONSTRUCTION
The sensor is part of the Volume Air Flow sensor assembly.