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Posts Tagged: MAP

P0109

Fix code P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent The Manifold Absolute Pressure sensor/Barometric Pressure Sensor (MAP/BARO)is a “speed density” method of determining the air fuel ratio. The sensor measures intake manifold vacuum, which varies depending on how wide open the throttle is. However, while the pistons are pulling a vacuum on the down-stroke, outside barometric pressure is also pushing air into the cylinder. So the sensor actually takes two readings—one before the engine starts (barometer pressure) and one after the engine starts. Once the engine is running, the computer … Read More

MAP sensor — what it does

What does MAP sensor do A Manifold Absolute Pressure (MAP sensor) gives the engine’s computer some data with which it can calculate the density of the incoming air. Calculating density is not as easy as it sounds. Sure, atmospheric pressure gives us some idea of the air’s weight. But remember, the engine is sucking in air, so it’s creating a vacuum. With atmospheric pressure pushing air into the engine and the pistons sucking air in, the computer really wants to know the difference between the two. That’s why the reading … Read More


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