Barometric Pressure (BP) Sensor

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