Cutlass Cruiser V8-307 5.0L VIN Y 4-bbl (1983)
Manifold Pressure/Vacuum Sensor: Description and Operation
Computer Command Control (C3) System
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.
Vacuum Sensor
If a MAP sensor is not used, a Vacuum Sensor may be used, although some systems may not use either component. The vacuum sensor produces low
voltage (approximately 1 volt) when manifold vacuum is low, and higher voltages (approximately 4.5 volts) when vacuum is high. Normal output is 0.54
- 0.62 volts with ignition on and engine stopped.
