Esteem GLX Wagon Plus L4-1.6L (1998)
Manifold Pressure/Vacuum Sensor: Description and Operation
Manifold Absolute Pressure Sensor (MAP Sensor)
This sensor senses pressure change in the intake manifold and converts it into voltage change. It consists of a semi-conductor type pressure
converting element which converts a pressure change into an electrical change and an integrated 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, ECM knows the manifold pressure (intake air volume).
ECM uses the voltage signal from the pressure sensor as one of the signals to control various devices.