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What are the omes and value of mass airflow sensor and amount of resistance?

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Unplugging the sensor connector below the MAF sensor, for testing purposes

  1. Using a multimeter, check for voltage by backprobing the MAF sensor connector.
  2. With the key ON, and the engine OFF, verify that there is at least 10.5 volts between the VPWR and GND terminals of the MAF sensor connector. If voltage is not within specification, check power and ground circuits and repair as necessary.
  3. With the key ON, and the engine ON, verify that there is at least 4.5 volts between the SIG and GND terminals of the MAF sensor connector. If voltage is not within specification, check power and ground circuits and repair as necessary.
  4. With the key ON, and the engine ON, check voltage between GND and SIG RTN terminals. Voltage should be approximately 0.34–1.96 volts. If voltage is not within specification, the sensor may be faulty.

Posted on May 12, 2010


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Symptoms of faulty air flow sensor

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    Jul 09, 2016 | Cars & Trucks

    2 Answers

    Where is the mass airflow sensor located on a 1997 Buick Skylark 2.4 liter

    Right off the air box its the first sensor on the vehicle .
    The air is sucked through the air filter then goes through the mass air sensor so its in the air duct .
    They have a spray can cleaner you have to remove the clamps and connections and remove it .Spray it with the cleaner some times it works .
    Its a rather expensive part but its vary important because it is the first sensor that the computer reads to adjust all engine controls .
    Also don't through it away you will get a lot for the re core value.

    Jun 15, 2016 | Buick Cars & Trucks

    1 Answer


    Hi there:This code can also be related to the MAF or mass air flow sensor. Lets test it before we try anything new.
    Testing and Inspection:

    This hot film type air flow sensor is composed of a hot film sensor, housing, and a metering duct (hybrid, sensor element). The mass airflow rate is measured by detection of heat transfer from a hot film probe. A change in the mass air flow rate will cause a change in the amount of heat being transferred from the hot film probe surface to the air flow. This results in a change in temperature of the hot film probe and a change of resistance.

    Circuit Diagram:


    Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

    Thank you for using FixYa, have a nice day.

    Aug 16, 2012 | 2001 Hyundai Elantra

    1 Answer

    Mass air flow sensor relay 1996 ford ranger 2.3 L

    The mass airflow SENSOR uses a small platinum wire with a current run through it to determine the volume of air flowing in.(More air makes the wire cooler,less air makes it hotter).After a while,deposits will build up on the wire,affecting the reading.(or,it may also get a high resistance open causing erratic operation).Every time I have seen a MAF sensor fail,unplugging it will force the PCM to substitute a value,which will make it driveable(it won't run very good,though).This is more effective on the cases where the wire is broken/breaking.If unplugging it somewhat cures your problem(you didn't say what the symptoms were),then try it.(make sure the new sensor goes in with THE ARROW FACING TOWARDS THE ENGINE(DIRECTION OF AIRFLOW!).(I have seen numerous clowns on car shows put it the other way and spend a ridiculous amount of time trying to diagnose it).

    May 28, 2012 | Cars & Trucks

    1 Answer

    Where is the mass flow sensor on a 2000 saturn sl2?

    The Mass Airflow sensor measures the amount of air entering the engine. For EVERY vehicle that is equipped with an Mass Airflow sensor, it is located in the same the air intake between the air cleaner and the throttle body.

    Nov 13, 2011 | 2000 Saturn SL

    1 Answer

    My 1991 240DL volvo has a hard start, and while idling, goes up and down, then eventually stalls out. The air flow sensor/air mass meter? was unhooked, and the car idled smoothly. Is it true that the car...

    When you unplug the mass airflow sensor, the car goes into "limp home" mode in which it runs full rich. Generally speaking, if a car runs better with the mass airflow sensor unplugged than with it plugged in, the mass airflow sensor has failed.
    However, the drifting idle tends to make me want to look for vacuum leaks and check the rear temperature sensor on the driver side of the head. I suspect that running over-rich is compensating for the vacuum leak so the car keeps running.
    If you have a propane torch or a can of diesel starting ether, spray it around the intake manifold while the car is idling and see if the engine speeds up. If so, then you have found a vacuum leak.
    If it were mine, I would buy a new intake manifold gasket and replace it as a routine maintenance item. It is not expensive or difficult to replace except that if you are like me, you WILL drop at least one nut, and there are several great hiding places on that side of the engine where the nuts go to hide when you drop them. You will need a magnet to recover them. You don't need to pull the manifold clear off, you just have to pull it clear of the bolts so you can slip in a new gasket. You can leave the throttle cables and most of the other connections hooked up
    If you know how to use an ohm meter, you might consider getting a manual for this car and looking up the appropriate resistance/temperature values and checking that rear temperature sensor.
    While you are replacing that intake manifold gasket, check all the vacuum ports to make sure they are clear, and check all the vacuum hoses to make sure they are intact. Also check the tubes between the mass airflow sensor and the throttle body for cracks. While you have those air tubes off, clean the throttle body and the idle air control valve with some carb cleaner. Spray a little carb cleaner through the mass airflow sensor as well. Actually, there is a special spray for cleaning mass airflow sensors that is more gentle, but I have used carb cleaner on them many times with no apparent ill effects.
    If it turns out that the mass airflow sensor has failed, that will run some $$, but having a fresh intake manifold gasket and clean throttle body and no vacuum leaks will be worth your time and money and make the car run better when you are done.

    Jun 07, 2011 | Volvo 240 Cars & Trucks

    1 Answer

    Does a 1996 Ford Taurus 3.0 have a hot wire type mass air flow sensor or a vane type? Would spraying carb cleaner into the MAF fix the problem of hard cold engine start? Once the engine warms up does the...

    TheMobilian, Yes, the Mass Air Flow is a Hot Wire type. There is a spray made for the mass called mas air flow cleaner. Regular cab cleaner is too harsh and can eat the coating inside mass air flow and it's delicate parts. Use throttle bore foam cleaner; it works like bathroom scrubbing bubbles and eats the gum and varnish. When engine warms up (closed Loop) both sensors work together giving input to ecm for output. Have someone with a live data reader read both sensors. (Let me know the readings?)

    Image Mass Air Flow(MAF)Sensor


    The Mas s Air flow (MAT) sensor measure s the amount of air flowing into the engine.

    This value is used by the Powertrain Control Module (PCM) in calculating the required

    Fuel injector pulse within order to provide the desired air fuel ratio. This input can also

    be used in determining Electronic Pressure Control (EPC). Shift and torque converter

    clutch scheduling.


    The MAE sensor is located directly in the airflow path between the air cleaner housing

    and the throttle body. Ail air entering the intake manifold must pass through the sensor.

    Located in the MAT sensor directly in the airstream are two platinum wires, a hot wire

    heated by electrical current and a cold reference wire. The MAF sensor uses the air flow

    across these wires to calculate its output.


    The hot wire is maintained at 200CC (392CF) above ambient temperature as measured by

    a constant cold *e. The current required to maintain the temperature of the hot wire is

    proportional to the air mass flow. The MAE sensor then measures the amount of

    electrical current required to maintain this temperature difference and converts this

    value to an analog DC voltage. This output varies directly with the mass air flow rate.

    Pay attention to the Paragraph about the torq converter.

    Dec 17, 2010 | 1996 Ford Taurus

    1 Answer

    I unplugged the Mass Airflow Sensor and my truck runs better. I'm told by parts suppliers there is no Mass Airflow Sensor. What part did I unplug and will it damage the engine to run without it?

    Most likely if there is no mass air sensor you actually unplugged the inlet air temperature sensor IAT. This is a little bead like thermistor that sits in the ducted air stream to measure incoming air temperature. Without an air mass sensor your engine will have instead a manifold absolute (air) pressure MAP sensor. This measures the absolute air pressure (the difference between the atmospheric air pressure outside and the drop in pressure inside) in the inlet manifold. The drop in pressure in conjunction with air temperature allows the engine control unit to calculate the amount of air in the engine to which it adds the correct amount of fuel per each injection cycle. The loss of the IAT signal is not critical as the ECU will assume a default value. However when extreme low temperatures are encountered the absence of the IAT may be become noticeable as the charge of air entering the engine will be denser and as a consequence the fuel mix will be much leaner; maybe to lean to start up.

    Sep 08, 2010 | 1998 Chevrolet S-10 Pickup

    1 Answer

    Sparkplug ignition coils

    not a coil problem. clean/replace your mass airflow sensor.. if YOU can.

    Jul 05, 2008 | 2002 Ford Escape

    2 Answers

    Check Engine light came on (2001 E320 with just 20,000 miles on it). After connecting the scanner, the code showed P0 170 and P0 173 which I was told was a Mass Air Flow (MAF) sensor problem. I...

    Those codes do appear to deal with the mass airflow sensor. The MAF sensor is probably the "hot wire" type where a thin wire is suspended inside the body of the sensor and is heated with electrical current. The amount of air passing over the wire is directly proportional to the resistance of the wire and that resistance data is calculated. The MAF sensor, by itself, cannot determine the air mass supplied to the intake plenum. One or more other sensors are used in conjunction to equate these values. The oxygen sensor(s), Manifold Absolute Pressure (MAP) sensor, the Intake Air Temperature (IAT) sensors may all play a part in this fault reading.

    There are reliable methods to test the MAF sensor. One well takled about method is to tap the MAF sharply with a screwdriver handle while the engine is running. If the engine dies, the MAF is faulty. This can detect a physical defect in the wire and a few other things but do do assume that, after repeated blows to the MAF with your dead blow hammer for good measure, that the MAF is at 100%. I will research some text on testing these sensors on that particular model and post links to any information and diagnostic data I find.

    Jun 03, 2008 | 2001 Mercedes-Benz E-Class

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