Stratus L4-2.0L VIN C (1997)
Manifold Pressure/Vacuum Sensor: Description and Operation
Fig. 9 Intake Air Temperature Sensor And MAP Sensor
OPERATION
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.
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. The MAP sensor mounts to the intake manifold Fig. 9.
CIRCUIT OPERATION
From the Powertrain Control Module (PCM), circuit K6 supplies 5 volts to the Manifold Absolute Pressure (MAP) sensor Circuit K6 connects to
cavity 61 of the PCM connector.
Circuit K1 delivers the MAP signal to the PCM. Circuit K1 connects to cavity 36 of the PCM connector.
The PCM provides a ground path for the MAP signal (circuit K1) through circuit K4. Circuit K4 connects to cavity 43 of the PCM connector
