Viper GTS V10-8.0L VIN E (1999)
Manifold Pressure/Vacuum Sensor: Description and Operation
MANIFOLD ABSOLUTE PRESSURE SENSOR - PCM INPUT
Map Sensor
The MAP sensor mounts to the drivers side intake manifold plenum.
The PCM supplies 5 volts to the MAP sensor. The MAP sensor converts intake manifold pressure into voltage. The PCM monitors the MAP
sensor output voltage. As vacuum increases, MAP sensor voltage decreases proportionately. Also, as vacuum decreases, MAP sensor voltage
increases proportionately.
During Key-On, before cranking the engine, the PCM determines atmospheric air pressure from the MAP sensor voltage. While the engine
operates, the PCM determines intake manifold pressure from the MAP sensor voltage. Based on MAP sensor voltage and inputs from other
sensors, the PCM adjusts spark advance and the air/fuel mixture.
