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MAP Sensor concerns the positive air pressure which enters the intake manifold in Chrysler PT Cruiser automobiles. This tiny, plastic Like a screw, it sends signals to the engine control unit allowing the ECU to change the fuel injectors so that the air volume in the cylinder is read to control the air-fuel mixture for combustion. It can also be that only naturally aspirated models of Chrysler PT Cruiser cars use MAP sensors of one type while cars with forced induction systems will have different types of MAP Sensors. Whereas naturally aspirated engines are basically controlled by the MAP Sensor only, the forced induction ones are regulated by both the MAP Sensor and the mass airflow (MAF) sensor. Realtime pressure is a necessity for fuel metering control and ignition timing among other critical operations, and therefore is an important player of the vehicle's electronic control systems.