mass air flow sensor testing

For information on recalls visit: www.recalls.gov. Testing for these three signals is easy and I'll take you step by step thru' the whole test. The most common symptoms of a bad MAF sensor are: As stated before, the Mass Air Flow Test is a very easy and simple test but there are a couple of things that have to be done first. A MAF sensor can be tested without a scan tool. More Information: An In-Depth Look at How Mass Air Flow Sensors … These three tests are: Making sure the MAF sensor is getting power. Regardless of what color body the MAF sensor has or the amount of wires in the connector, they are all tested in the same way! Suzuki  |   It is mounted in the intake pipe between the air filter housing and the intake manifold. Locate Subaru mass airflow sensor to the engine air filter housing. How much does a new Mazda air flow sensor cost? The air-mass sensor is used to measure the intake air mass. The Basics Of Testing A Mass Air Flow (MAF) Sensor, Cómo Se Prueba Un Sensor MAF -Soluciones Automotrices. Also, don't attempt to physically clean the sensor with anything. Conduct an electronic test of the mass air flow sensor by the engine management control unit. Disclaimer. In this article I'll show you how to do it in a step-by-step fashion, that will either condemn the mass air flow (MAF) sensor as bad or exonerate it. Online the MAF sensor can be bought for as low as $50. Remove two screws that hold the sensor in place. Now, in case this is not the article you're looking for, there are also 3 other GM MAF sensor test articles: How To Test The GM Mass Air Flow Sensor: GMC Savana Van and Chevy Express Van 4.3L, 5.3L, 6.0L Engines (2003-2008) How To Test The GM Mass Air Flow (MAF) Sensor: 4.8L, 5.3L, 6.0L, and 8.1L V8 Engines (1999-2010) Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. A misfire condition will skew the results of the test you'll perform here. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. Honda  |   The mass air flow (MAF) sensor in a Nissan truck sends a signal to the truck's computer. Don't use carb or brake clean spray. They compare the readings to the specifications or to the readings of a known-good mass airflow sensor. This wire is heated by the MAF with a pre-calculated voltage/current value. Question: My mass air flow sensor on an 88 Camaro 2.8 reads 5-volt reference between signal and ground while running and unplugged, on the ECM side, ... An air or vacuum leak can confuse the computer about air volume. This article will walk you through the whole process without removing the MAF sensor from the engine. The mass air flow sensor (MAF) has become a standard part on most engine applications and is mounted in the intake air stream just past the air filter. This is an ON CAR Test. Testing the Ford mass air flow (MAF) sensor on all of the Ford, Lincoln and Mercury cars and trucks is a very simple test that can be done without a scan tool. If a fault occurs, a fault code is stored in the control unit and can be obtained using a diagnostics unit. HOW TO KNOW IF MAF SENSOR IS BAD. In this tutorial, I'm gonna' show you how to do it with just a multimeter and in step-by-step manner. As mass air flow is determined by a difference in resistivity between the reference and exposed wires, any factor that influences this will result in inaccurate readings. This is not the most definitive list on the subject, but does cover the majority of symptoms I've seen on these types of Ford mass air flow sensors: The most common fix I've performed on the majority of MAF sensor problems on Fords have been cleaning it. Cleaning this type of sensor is easy since the hot-wires are clearly visible to the eye (with the sensor removed). MASS AIR FLOW SENSOR TEST Scanner Used in the video: https://amzn.to/2DTTDuJEngine light is often triggered by … That there are no ignition system misfires. What I mean is that a dirty MAF sensor doesn't wreak a lot of havoc on the car or truck. NOTE: There are several different Ford MAF sensors types. At first glance, the digital air temperature signal is similar to the air flow signal; however, the former is often a pulse-width modulated (PWM) waveform with a fixed cycle rate of around 20 kHz. In this article I am going to briefly explain the three basic multimeter tests that are done to find out if it's bad or not. How the mass air flow sensor is tested. Kevin Costner in The Postman, Home  |   Puedes encontrar este tutorial el Español aquí: Cómo Se Prueba Un Sensor MAF -Soluciones Automotrices (en: autotecnico-online.com). Disclaimer. Suzuki  |   You can clean a Mazda airflow sensor using an Air Flow Sensor Cleaner. For a list of our MAF sensor testing results along with the dealerships involved go to our MAF Sensor Test Results page. How To Test The Mass Air Flow (MAF) Sensor (GM 3.5L) Testing to see if the MAF sensor on your 3.5L GM equipped car or pickup or SUV is bad or not can easily be done with a multimeter. You’ll notice if the tailpipes eject black smoke or when the engine runs rough or backfires. En Español  |   How? Our systems accurately measure mass flow rate for leak and blockage testing and are customizable. Install the new sensor and plug in the wire harness. This contamination will cause the sensor to produce a lower reading to the fuel injection computer. Replacing a mass air flow sensor is fairly straight forward, so most of the cost comes from the cost of the part, and not the labor. The Ford MAF sensors are some of the easiest MAF sensor to clean. Contact us to learn more about mass flow leak testing solutions. MAF Codes that light up the check engine light (CEL) on your instrument cluster. Chrysler  |   With this MAF Sensor, you never need to worry about quality. MAF sensor malfunction that DOES NOT light up the check engine light (CEL). How do you check for air leaks? That the engine does not have any vacuum leaks. How to Test the Mass Air Flow Sensor in a Nissan Truck. A Mass Airflow -- MAF -- Sensor in a modern Ford vehicle is located inside the air intake duct. Outside the gilded cage..." Rush ‘Limelight’, Home  |   Isuzu  |   Well: Why does it get dirty/contaminated? Now, the symptoms that accompany a dirty (contaminated) Ford MAF sensor are not that harsh or noticeable on engine performance (of course this is not an absolute truth). Air entering after the mass air flow sensor into the engine will negatively impact fuel injection. 6. Sensors fail and are even the subject of full recalls by vehicle manufacturers. The most important thing to do first, is to make sure your MAF sensor isn't contaminated with dirt and/or oil, since the tests in this article assume the MAF sensor isn't contaminated. Jeep  |   GM  |   You can find this tutorial in Spanish here: Cómo Probar El Sensor De Flujo De Aire (Sensor MAF) de Ford (at: autotecnico-online.com). These solvents can damage the sensor. Do NOT follow this link or you will be banned from the site! The mass air flow (MAF) sensor, part of your vehicle’s electronic fuel injection system, is responsible for calculating the total amount of air entering the engine. VW  |   All you need is a multimeter. Do NOT follow this link or you will be banned from the site! VW Mass Air Flow (MAF) Sensor Test (5 Wire Type) The most common way to test the 5 wire VW Mass Air Flow (MAF) sensor is just to unplug it with the engine running. Testing the MAF ( M ass A ir F low) sensor on your Ford truck or SUV or full size van is a very simple and easy affair. Although I'm not going to be going into details about each of the different type types of MAF sensors, I will show you where you can find tutorials to test the MAF sensor for Buick, Chevrolet, Ford , GMC, Isuzu, Mazda, Mercury, Nissan, Oldsmobile, and Volkswagen (on last page of article). As stated in the list at the beginning of this article, other symptoms may include but are not limited to: higher tailpipe emissions and diagnostic codes that may illuminate the check engine light. A MAF sensor can be tested without a scan tool. Making sure that the sensor is getting Ground. Mass flow testing systems from Cincinnati Test Systems are offered in various configurations to meet your air flow testing requirements. If possible, test the sensor before replacing it. If your Ford or Mercury vehicle uses the MAF sensor in the round Canister Air Filter assembly, go here: Ford MAF In Round Canister Air Filter Assembly. If you need to clean it, here's the article: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999. MASS AIR FLOW SENSOR TEST - YouTube. I recommend using a digital multimeter but an analog multimeter can also be used. The second most common problem I have encountered on most Fords (Mercurys and Lincolns) over the years is air leaks between the MAF sensor and the throttle body. As the intake air increases, the voltage from the MAF sensor increases. If it is producing a signal, but the signal's response is too slow to changes in throttle position, then I know to look into cleaning it. Air changes its density with temperature and pressure. I'll remove it (before I start any testing) and eye-ball the two 'hot-wires' to see if they are covered in fuzz or other material (you can see an example of this here: Or, I'll test it first following the guidelines set in this article, to see if it's producing a MAF signal. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. Mechanics measure the amount of air flow (mass air flow sensor readings) at different RPMs. If the Ford MAF sensor on your car has 4 wires, then it does not have an air temp sensor integrated within it (the air temp sensor will be somewhere on the air duct that connects the MAF sensor to the throttle body or somewhere on the intake manifold. So, if you own one of the relevant Volkswagen models, just go for it. Testing to see if the mass air flow (MAF) sensor on your Toyota 1.8L equipped Corolla is bad (or not) isn't hard. Start the car to make sure there are no performance issues. So how do I diagnose a dirty/contaminated Ford MAF sensor? Mitsubishi It uses a hot wire element to measure the amount of air entering the engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. You want to make sure you are dealing with a faulty sensor. The element is cooled as air passes over it, and this information is converted into an electronic pulse to be relayed to the on-board computer, which can then calculate fuel injection functions. share. If you are going to replace the MAF yourself, then I'd always recommend buying an OEM mass air flow sensor. The most common symptom of this contamination is a hesitation or a time-lag in engine response that is felt after the accelerator pedal is depressed. It consists of a tubular housing with flow straightener, sensor protection, and sensor module. Yes, a digital multimeter can be used in testing the Mass Air Flow (MAF) sensor. If cleaning the MAF sensor, use an electronics spray cleaner to do it with. With a digital multimeter. Just eyeball and physically shake/move the ducting to see if it's loose or disconnected. Misc Index  |   Why? As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Ford Ignition System Circuit Diagram (1992-1993 4.9L, 5.0L, And 5.8L), Ford Ignition System Circuit Diagram (1994-1995 4.9L, 5.0L, And 5.8L), Fuel Pump Wiring Diagram (1993-1995 F150, F250, F350), "Wouldn't it be great if wars could be fought just by the assholes who started them?" Here is a video on how a Mass Air Flow and a Manifold Absolute Pressure Sensor work and also how you can test them using a basic multimeter. Nissan  |   If the MAF sensor has 6 wires, then this is a dead giveaway that it has the air temp sensor integrated inside. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. In this article I am going to briefly explain the three basic multimeter tests that are done to find out if it's bad or not. That's right, no special tools required. Vehicle: 2001 Land Rover Discover II Codes: P0171, P0174, TCM Incorrect Gear Ratio Symptoms: NONE, Slight pre-detonation (pinging) when hot STRAIGHT TO THE POINT: The vehicle has no drivability concerns and was hard to diagnosis. Check your local auto parts store, they will have MAF sensor cleaning spray. Although MAF sensors will vary in their setup from one car to another, generally there are 3 basic test that are done to see if it has failed or not. En Español  |   Testing The MAF Sensor With A Multimeter. With a digital multimeter. by Cayden Conor. This in itself may solve your problem. Mitsubishi At the dealership, it will cost anywhere from $200 to $300. Honda  |   1 While several modern sensor designs (for example, microcontroller-based mass air flow sensors) try to reduce exposure to possible contaminants, even these devices will require cleaning from time to time. It is crucial, yes very critical that you first check that there are no air leaks between these two. Ford  |   The MAF sensor Test consists of verifying that the MAF sensor is receiving 12 Volts, Ground, and that it is indeed producing a correct MAF Signal. In modern cars, the only way to test the mass air flow sensor is with a scan tool. Yes. Nissan  |   As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Chrysler  |   Yes, a digital multimeter can be used in testing the Mass Air Flow (MAF) sensor. If your check engine light is on you could have a bad mass air flow sensor. I recommend using a digital multimeter but an analog multimeter can also be used. How To Test The Ford Mass Air Flow (MAF) Sensor, Cómo Probar El Sensor De Flujo De Aire (Sensor MAF) de Ford, Ford MAF In Round Canister Air Filter Assembly, How To Clean The Ford Mass Airflow Sensor. A replacement mass air flow sensor can cost anywhere from $20 to $600. A tremendous lack of power upon acceleration. Mass air flow sensors accuracy skews over time and can lead to fault codes or drivability problems. The “air gulp” test uses a labscope to display the MAF output voltage increase during a snap-throttle test, and should show the voltage rising from about 0.7 to a higher voltage that’s dependent upon the condition of the MAF and of the engine and exhaust system. Isuzu  |   Jeep  |   On top of testing the mass airflow sensor by disconnecting it, you can also test some of your vehicles other sensors by disconnecting the mass airflow sensor. When testing a digital air flow meter, the output signal must be correctly identified: these units often measure both air flow and intake air temperature and give each a digital output. A faulty MAF sensor can cause your vehicle to run too rich or run too lean. How? 0 0 0. Misc Index  |   Ford has used a Hot-Wire type mass air flow sensor for many years that either comes with or without an internal air temperature sensor. GM  |   IAT Sensor Wire Insulation Problem And Wires Shorted Together, How To Bench Test A Ford Relay (Large Relay), "All the world's indeed a stage, and we are merely players, performers and portrayers, each another's audience. A tremendous lack of power upon acceleration. Since the air flow sensor hot film monitors heat-loss to the passing air, it automatically adjusts for the increased volume (= lower density) of the incoming air. If the MAF is bad (either because it's not producing a signal or producing an erratic one), the car's idle will return to normal and the car will seem to run fine. Ford  |   Testing the Ford mass air flow (MAF) sensor on all of the Ford, Lincoln and Mercury cars and trucks is a very simple test that can be done without a scan tool. This material may not be reproduced without the author's consent. A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine.. VW  |   The HFM6 style sensor sends a digital mass air flow and temperature signal to the DME. Usually the biggest complaints are bad gas mileage and/or a slight lack of power. No guarantee cleaning will fix the problem. All you need is a multimeter. If the car dies when you disconnect the mass airflow sensor, then that means it was working right and that your computer has issues. Tags: Engine Management Exhausts & Emissions. Well, this MAF sensor easily becomes contaminated with dirt and stuff from the air filter not performing its job or the box that holds the air filter is broken or not sealing correctly. And will skew the results of your tests which could result in the replacement of a good MAF (and in the process throwing money away). Cleaning is successful in cases when the sensor has gotten dirty. It measures the amount of air (volume) in the intake flow by way of a thin wire mounted in the air stream. With your eyes and hands. Because this MAF sensor is a hot-wire type that easily becomes contaminated with dirt and stuff from the air filter not performing its job. This material may not be reproduced without the author's consent. Power is in the form of 10 to 12 Volts DC. ECCPP Mass Air Flow Sensor goes through computerized testing before reaching the market. All it takes is to remove the two torx head screws that hold it in place and spray-clean the two hot-wires with a MAF sensor Cleaner. These come in either a black or light gray body and with 6 or 4 wires in the connector. Mass Air Flow Sensor Testing,P0171-P0174 System Lean. Unplug the electical connector by pressing on the sensor and pulling it away. After having checked for contamination the other things that you must check for (and eliminate if present) are: If the above conditions exist, repairing them first will more than likely solve your vehicle's drive-ability issue without having to test the MAF sensor, if not continue with the MAF Test in this article. Auto repair shops hate this video.

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