Hyundai Matrix Absolute Pressure Sensor

The absolute pressure sensor is a load cell that measures the pressure in the receiver. Inside the sensor is a metal diaphragm connected to a small wire. A change in pressure causes the diaphragm to deflect, the wire to stretch, and its electrical resistance to change. The engine control unit supplies the sensor with a voltage of 5 V and determines the amount of voltage drop in the sensor. The sensor outputs a signal in the form of a voltage, and as the pressure decreases, the voltage drop across the sensor increases. Since the MAP sensor is used as an air mass sensor, its signal is one of the important types of information that the ECU uses to regulate fuel delivery and ignition timing.

Rice. 2.239. Absolute pressure sensor connector

Rice. 2.240. Connection diagram for intake air temperature sensor with ECU 

Source: http://www.navigator.mn/hyundai-matrix/dvigatel/proverka-sistemi-upravleniya-dvigatelem-s-raspredelennim-vpriskom/datchik-absolyutnogo-davleniya.html