DeVille V8-4.6L VIN Y (1998)
Powertrain Control Module: Description and Operation
MAP Sensor
Voltage Versus Pressure Chart
DESCRIPTION
The MAP sensor is a potentiometer that is mounted on the intake manifold and measures the changes in intake manifold pressure due to engine speed
and load changes.
OPERATION
The 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. 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.
