Air absolute pressure sensor. Manifold Absolute Pressure Sensor. New. American standard. High quality. Located in Georgia. Price: 150 GEL. The main function of the MAP sensor is to measure the absolute air pressure in the engine's intake manifold and send the data to the engine control unit (ECU). Based on this information, the car's computer calculates how much air of what density enters the engine. This is needed to adjust two important processes: fuel delivery (fuel injection): the computer precisely determines how much gasoline or diesel the injectors must spray to keep the ideal air-fuel balance. Ignition timing: the engine load is determined from the sensor, and the computer adjusts the ignition angle (when the spark plugs deliver the spark) to prevent engine detonation (the so-called 'knock' sound). Symptoms of a faulty MAP sensor: if the sensor gets dirty or fails, it may send wrong data to the computer, causing problems such as: the Check Engine light comes on the dashboard. A sharp increase in fuel consumption. Unstable engine operation at idle.