DeVille V8-4.6L VIN 9 (1995)
Manifold Absolute Pressure (MAP) Sensor: Description and Operation
Voltage Versus Pressure Chart
DESCRIPTION
The Manifold Absolute Pressure (MAP) sensor is a potentiometer that measures the changes in intake manifold pressure due to engine speed and
load changes. The Powertrain Control Module (PCM) supplies a 5 volt reference signal and a ground to the MAP sensor and the sensor in turn sends
a voltage signal to the PCM.
OPERATION
As manifold pressure increases (vacuum decreases), the voltage signal increases and as manifold pressure decreases (vacuum increases), the voltage
signal decreases. A high pressure signal will be close to 5 volts and a low pressure signal will be close to 0 volt.
