Prowler V6-3.5L VIN G (1999)
Manifold Pressure/Vacuum Sensor: Description and Operation
MANIFOLD ABSOLUTE PRESSURE(MAP) SENSOR
The Powertrain Control Module (PCM) supplies 5 volts to the Manifold Absolute Pressure (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.
Key on, before the engine starts running, 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.
The MAP sensor mounts to the intake manifold.
MANIFOLD ABSOLUTE PRESSURE SENSOR-PCM INPUT
The Powertrain Control Module (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 cranking, before the engine starts running, 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.
MAP Sensor 1999
On the 3.5L engines, the MAP sensor mounts to the driver side of the intake manifold plenum. The MAP sensor must be horizontal.
The sensor return circuit provides a low electrical noise ground reference for all of the systems sensors. The sensor return circuit connects to
internal ground circuits within the powertrain control module.
