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With this setup, the PCM uses input from the manifold absolute pressure (MAP) sensor and various other sensors when calculating fuel delivery. Some models use what’s called a Speed Density System, instead. It’s important to note that not all cars have a MAF sensor. The PCM uses the increase in current demand to determine the amount of air entering the engine.
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Airflow cools the element, reducing its electrical resistance, and creating an increase in current demand. To measure airflow, the PCM continuously provides electrical current to heat the hot wire or hot film element. Both types of sensors operate in a similar manner. The two most common designs are hot wire and hot film. There are several different types of MAF sensors found in different vehicles. The PCM uses the MAF sensor signal when calculating how much fuel to give the engine-more air equals more fuel. What Does a Mass Air Flow Sensor Do?Īs was mentioned, the MAF sensor measures the amount of air entering the engine. Reduced Fuel EconomyĪ faulty MAF sensor can throw off your engine’s performance, leading to an increase in fuel consumption. Similarly, a faulty MAF may cause your car to hesitate and stall. When that happens, the vehicle may exhibit a lack of acceleration. Lack of Acceleration, Hesitation, and StallingĪ bad MAF sensor can trick the PCM into starving the engine for fuel. The outcome is an engine that runs rough and misfires. As a result, the combustion process-the ignition of the air/fuel mixture inside the engine-will be incomplete. That can either cause the engine to run rich (too much fuel) or lean (too little fuel). Without an accurate signal from the MAF sensor, the PCM won’t know how much fuel to give the engine. A faulty MAF sensor can also trigger other codes, such as those pertaining to an air/fuel ratio imbalance or an engine misfire. Some of the most common MAF-related DTCs include P0100 through P0103.
#99 ASTRO VAN BAD ECU DIAGNOSTIC PORT CODE#
Often, when there’s an issue with the MAF sensor, your car’s primary computer-often referred to as the powertrain control module (PCM)-will turn on the check engine light and store a diagnostic trouble code (DTC) in its memory. Some of the most common air flow sensor problems include: Illuminated Check Engine Light Mass Air Flow Sensor Symptomsīecause the MAF is a primary input to your car’s computer for fuel control (more on that later), the sensor can cause several noticeable symptoms when it fails. The mass air flow sensor measures the amount of air entering the engine. So, if you think your MAF might be faulty, it’s a good idea to address the issue as soon as possible. What’s more, the problem can damage other parts of your vehicle, such as the catalytic converter, if left unchecked. When the device goes bad, it can lead to various symptoms, ranging from an illuminated check engine light to rough running and misfiring.Īs you might guess, a bad MAF sensor can be a huge inconvenience. Many cars use a mass air flow (MAF) sensor to measure the amount of air entering the engine.