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Home >> Mercury >> 1994 >> Villager LS >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Barometric Pressure (BARO) Sensor

Barometric Pressure (BARO) Sensor

BARO sensor measures barometric pressure of atmosphere. Variations in atmospheric pressure (changes in altitude) modify an electrical signal monitored by PCM. The BARO sensor input affects spark advance, EGR flow and air/fuel mixture adjustments by PCM. Sensor input is updated during key-on and wide open throttle applications. BARO sensor looks identical to Manifold Absolute Pressure (MAP) sensor.

NOTE: Tubing nipple on BARO sensor is open to atmosphere, while tubing nipple on MAP sensor is connected to intake manifold.
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