Subaru mass air flow sensor problems




Subaru mass air flow sensor problems

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  • You should be careful about bad MAF sensor symptoms because a little malfunction in this device leads to poor engine performance.

    Symptoms of a bad Subaru mass air flow sensor. How to change subaru mass air flow sensor yourself.

    The mass airflow (MAF) sensor measures the mass (or weight) of the air as it passes through the throttle body to the intake manifold. It transmits this information.

    Subaru mass air flow sensor problems

    Subaru mass air flow sensor problems

    Also, i have been pondering purchasing an obd2 reader with code 6 i believe, capability which will read even without the check engine light on. This prevents the meter from drawing too much current and destroying sensitive electronic devices. If you know you are getting good spark and proper fuel pressure, these other posts might help: I put it back in and the car ran good. Basically, the MAF sensor—also known as airflow meter—measures the amount of air flowing into the engine through the air cleaner assembly, which contains the air filter and connects to the throttle body.

    Subaru mass air flow sensor problems

    Subaru mass air flow sensor problems

    Subaru mass air flow sensor problems

    Subaru mass air flow sensor problems

    Subaru mass air flow sensor problems

    Basically, the MAF sensor—also known as airflow meter—measures the amount of air flowing into the engine through the air cleaner assembly, which contains the air filter and connects to the throttle body. Depending on the make and model, your car uses either a hot-wire the most common or a hot-film type airflow meter. Different design, same function: Tell the computer how much air is flowing into the engine.

    The computer uses this information, along with input from other sensors, to provide the correct amount of fuel to the engine at any given time. The hot-wire type sensor maintains a wire located in the middle of the airstream at a higher temperature than the air flowing in. To maintain this predetermined temperature, electric current to the wire increases as airflow increases.

    Subaru mass air flow sensor problems

    In general, the hot-film type sensor works the same way except it uses a film instead of a wire to send the signal to the computer. It is this extra amount of current the sensor is using that tells the computer how much air is flowing in.

    In other words, the faster you drive, the higher the cooling effect on the hot wire or film, the more current flowing to the sensing element. So you can use the sensor operating logic to conduct your tests. Here, we'll go over the steps you need to troubleshoot a hot-wire type MAF sensor using a digital multimeter DMM to read the voltage signals. Testing a film-type sensor is no different, except that you check for frequency signals instead of voltage.

    Subaru mass air flow sensor problems

    For this, you'll need a digital multimeter DMM or an oscilloscope that can read frequencies. Other than that, the next steps apply. Installing a new mas airflow MAF sensor to see if it'll fix your engine driveability problems is not a good diagnostic approach. But you can learn how to troubleshoot one in a few steps following this simple guide.

    Here, you'll see what is the most common problem affecting MAF sensors and what to do about it , what you need to pay attention to during your troubleshooting procedure, and, finally, find out whether you are dealing with a bad sensor.

    Before we jump into the diagnostic, though, let's take a look at how the MAF sensor works so the procedure makes sense to you. On some vehicle models, the MAF sensor also informs the computer on air intake temperature and engine load to control some automatic transmission functions so the number of symptoms increases.

    Subaru mass air flow sensor problems

    However, you can hardly diagnose a MAF sensor on symptoms alone. Other faulty components can also produce these same symptoms, like the fuel pump, fuel pressure regulator and vacuum system. Thus, the need to troubleshoot the MAF sensor and related circuits as needed before replacing components.

    So now that you have a broad knowledge of how an airflow meter works, you are ready to test the MAF sensor. So let's get ready. First, open the hood of your vehicle and locate the MAF sensor on the air cleaner assembly.

    How to identify and clean a dirty MAF sensor (Subaru)



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