Summit Wagon AWD L4-1795cc 1.8L SOHC (1994)
Barometric Pressure Sensor: Description and Operation
Barometric Pressure Sensor
PURPOSE
The Engine Control Module (ECM) uses the voltage signal to adjust the air-fuel ratio and ignition timing as altitude changes to improve
driveability at high altitude.
OPERATION
-
The ECM supplies a 5 Volt reference and a ground to the sensor.
-
As the resistance of the sensor changes the voltage across the sensor varies. This voltage is read as barometric pressure by the ECM.