This sensor is use to measure the amount of vacuum in the intake manifold because the amount of intake manifold vacuum is directly related to engine load. The ECU takes this infomation and use it to calculate the correct amount of fuel to inject, when to ignite (ignition timing retard or advance) and other function.
How it works
In the MAP sensor there is a silicon chip mounted inside a reference chamber.One side of the chip is the reference pressure.This reference pressure is a calibrated pressure,on the otherside is the pressure to bo measured. The silicon chip changes its resistance with the change in pressure. This change in resistance alters the voltage signal which tells the ECU there was a change in pressure.
Stock map sensor can stand up to MAX 1 bar (15psi) boost
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