Precis L4-1468cc 1.5L SOHC (1993)
Barometric Pressure Sensor: Description and Operation
California Emissions
PURPOSE
The Barometric Pressure Sensor measures atmospheric pressure and converts the measurement into a voltage signal which is sent to the ECU.
Barometric Pressure (BARO) Sensor Circuit
OPERATION
The ECU uses the voltage signal to adjust the air-fuel ratio and ignition timing for the altitude at which the vehicle is running, improving
driveability at high altitude.