Manifold Pressure/Vacuum Sensor: Description and Operation

Manifold Absolute Pressure (MAP) Sensor:

Output Characteristic:

This pressure sensor signals the ECM pressure changes in the intake manifold. It consists of a semiconductor type pressure converting element which converts a pressure change into an electrical change and an electronic circuit which amplifies and corrects the electric change. The ECM sends a 5-volt reference voltage to the pressure sensor. As the manifold pressure changes, the electrical resistance of the sensor also changes. By monitoring the sensor output voltage, the ECM senses the manifold pressure. The ECM uses the voltage signal from the pressure sensor as one of the signals to control fuel injector, ISC solenoid valve, shift-up indicator light and EGR VSV (if equipped).