Metro L3-61 1.0L (1990)
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).