Description and Operation: Description
The Manifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor, and is installed on the surge tank. It senses absolute pressure of the surge tank and transfers an analog signal proportional to the pressure to the ECM. By using this signal, the ECM calculates the intake air quantity and engine speed.
The MAPS consists of a piezo-electric element and a hybrid IC, amplifying the element output signal. The element is silicon diaphragm type and adapts the pressure-sensitive variable resistor effect of the semi-conductor. Because 100% vacuum and the manifold pressure apply to both sides of the sensor respectively, this sensor can output an analog signal by using the silicon variation proportional to pressure change.