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What is a maf sensor


A mass (air) flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0-5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

Aug 03, 2015 | Cars & Trucks

2 Answers

I have a 2003 suzuki Aerio S, the code MAF came up when they tested it. If it doesnt work after the mechanic cleaned it, how much is going to cost to fix the problem?


The mass airflow sensor shouldn't be that expensive and usually they are easy to replace so there shouldn't be much labor involved. I''m guessing less that $100 should cover it.

Mar 04, 2011 | 2003 Suzuki Aerio

1 Answer

Starting problems


Check the Mass airflo sensor, Mine went out and did not start. Check engine light shows air intake





May 29, 2010 | 2005 Nissan Sentra

1 Answer

My 2005 Sante Fe hesitates and won't get up to speed whenever it is damp or rainy outside. What causes this? Thanks


It could be your MAF (Mass Air Flow) sensor. Do you have any SEL {Service Engine) light coming on?

A mass air flow sensor is used to find out the mass of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and use of a turbocharger and this is an ideal application for a mass sensor. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in usage on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0- 5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.
When a MAF is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

May 27, 2010 | 2006 Hyundai Santa Fe

1 Answer

Bad fuel conservation.i changed spark plugs. gapped them at 40. also new rotor,rotor cap and new wires,and a new coil. new exaust.


Your mass air flow meter is your problem.it needs changing has it is not messuring the air to fuel mixture,causing to mutch fuel being used and not enough air good luck

Nov 17, 2009 | 2000 Dodge Ram 1500 Truck

2 Answers

MAAS AIR SENSOR


A mass air flow sensor is used to find out the mass of air entering a fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature and altitude, and this is an ideal application for a mass sensor. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in usage on gasoline engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0 - 5.0 volt or a PWM signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.

Nov 09, 2009 | 1999 Oldsmobile Silhouette

1 Answer

Car runs perfectly. Check Engine Light & Vehicle Skid Control Light keep coming on.


i have a 2001 corolla myself with the check engine light on for awhile. these cars are notorious for having bad o2 sensors and Mass air flow sensors. These are parts that help the engine utilize gas properly, basically energy conserving, pollution reducing parts. From my experience the car runs fine with the light on as long as it is these problems. You could take it to an autozone and have them run the codes for you and you could make sure that is the problem, but i have read a lot of forums that speak to this issue. you can also clean the MAF sensor with some Electrical cleaner (found in auto section of Walmart). Goggle the problem and you can find step by step toturials that walk you throught DIY process. It is really simple actually. The O2 sensor might need to be replaced make sure you get the OEM part and not the universal.

Jul 29, 2009 | 2001 Toyota Corolla

2 Answers

1995 Buick LeSabre hesitating.


try change the fuel filter.
and sure there is no abstraction in the air flow from the air filer to the air mixture intake.

Oct 15, 2008 | 1995 Buick LeSabre

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