What exactly does the MAP sensor do?
2007-07-25 14:57:16 · 5 answers · asked by Amy S 1 in Cars & Transportation ➔ Maintenance & Repairs
A manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.)
An engine control system that uses manifold absolute pressure to calculate air mass, is using the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel injected engines use a MAP sensor to infer mass air flow, some use a MAF sensor (mass air flow).
2007-07-25 15:01:39 · answer #1 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋
Definition: a variable resistor used to monitor the difference in pressure between the intake manifold at outside atmosphere. Dont know if that does you any good but the basic idea is that it helps the computer of the vehicle to read whats going on in the intake so that it can change the fuel trim (fuel to air mixture) to keep the vehicle running more smooth. It can make the truck hard to start if not working properly and possibly make it idle very rough or even die.
2007-07-25 22:06:50 · answer #2 · answered by TripleXXXrated 2 · 0⤊ 0⤋
Refers to a Manifold Absolute Pressure sensor, a variable resistor used to monitor the difference in pressure between the intake manifold at outside atmosphere.
2007-07-25 22:05:15 · answer #3 · answered by ronkpaws 3 · 1⤊ 0⤋
MAP/BP (manifold absolute pressure/ barometric pressure) senses baro for calibration to different altitudes and senses manifold vacuum to calculate for different loads. When they go bad, IF engine runs it won't run very well.
You've heard of air/fuel mixture, this is the sensor that sets the right amount of air to go with the fuel.
2007-07-25 22:13:04 · answer #4 · answered by oklatom 7 · 0⤊ 0⤋
tells the comp the air pressure going to the engine compared to outside pressure .It`s one of the parameters the comp uses for calculations of fuel,timing ,etc
2007-07-25 22:06:55 · answer #5 · answered by miiiikeee 5 · 1⤊ 0⤋