Firebird V8-305 5.0L (1982)
Manifold Pressure/Vacuum Sensor: Description and Operation
Manifold Absolute Pressure (MAP) Sensor
The MAP sensor supplies a varying DC voltage signal to the ECM representing manifold pressure----usually used in conjunction with a BARO
sensor.
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When manifold pressure is low (high vacuum), sensor output voltage is low--under 1 volt.
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When manifold pressure is high (low vacuum), sensor output voltage is high--4.5 volts.
NOTE: Turbocharged models are equipped with a MAP sensor with internal altitude compensation.
