how to test mass air flow sensor with scan tool

In general a hot wire MAF sensor produces an input to the PCM when a low-amperage electrical current is passed through a metal-film resistor suspended in the MAFs air stream. So well go in there and see how it works.

Failure In Spec What Happens When A Mass Airflow Sensor Lies 2016 04 12 Auto Service Professional

Lean andor rich code s.

. This causes the engine computer to miscalculate the amount of injected fuel. How the mass air flow sensor is tested In modern cars the only way to test the mass air flow sensor is with a scan tool. The reading of the MAF sensor is usually measured when the vehicle is idle.

A scan tool is one of those MUST have tools to be able check and diagnose todays modern cars and trucks but for the tests in this article you dont need one. First enter in KOEO mode and. The reading of the amount of MAF is measured at different RPMs.

The PCM Powertrain Control Module Fuel Injection Computer then uses this measurement of air flow to inject the correct amount of fuel. The intake consists of a series of tubes usually plastic but sometimes metal. Take apart your air intake system and find the MAF sensor.

A tremendous lack of power upon acceleration. Mass Air Flow Sensor live test. If playback doesnt begin shortly try restarting your device.

And the first thing is always component information once we open a component. The air mass sensor precisely measures the air mass that flows into the engine mass air flow. During a full-throttle acceleration the O2 sensor would normally.

Trouble codes P0171 System Too Lean Bank 1 and P0174 System Too Lean Bank 2 are also often caused by a bad or contaminated mass air flow sensor. Fuel trim code s. A basic digital multimeter DMM with at least 10 Megohms of impedance to protect circuits and your cars computer will help you test your MAF sensor.

Black smoke coming from the tail-pipe. Vehicle may idle rough and stall. How to test a GM MAF Sensor Part 1 Watch later.

A MAF sensor code. Mass airflow sensors MAF which are used on a variety of multiport fuel injection systems come in two basic varieties. This Mitsubishi mass air flow MAF.

First thing right there airfuel ratio sensor. The reading should be fairly consistent and not drastically fluctuate and should read higher at higher RPMs. Videos you watch may be added to the TVs watch history and influence TV recommendations.

This causes the engine computer to miscalculate the amount of injected fuel. The GRYBLK wire is the one that connects to MAF sensor pin 3 in the illustration above. To test the MAF sensor youll need to have the electrical connector plugged into the sensor.

As mentioned earlier you dont need an automotive scan tool to test the MAF sensor. Hot wire and hot film. A contaminated or failed mass air flow sensor cannot measure the amount of air flow correctly.

Similarly it is asked what happens when mass air flow sensor fails. Though slightly different in design both types of sensors measure the volume and density of the air entering the engine so the computer can calculate how much fuel is needed to maintain the correct. The amperage flow through the resistor changes because the electrical resistance of the resistor is responding to the cooling effects of rapidly moving air.

So check if you can backprobe the wires. So well go in there Guided Component Tests menu its in the fuel injection system and there it is. Mechanics measure the amount of air flow mass air flow sensor readings at different.

How to Test MAF Sensor You can test the performance of mass air flow sensor with the help of a scan tool. With newer cars you may use a scan tool to test the digital signal produced by the air flow sensor. The signal from the air mass sensor is used to calculate the injected fuel quantity.

A dirty MAF can be diagnosed quickly and accurately with a scan tool running in generic OBD II mode. A contaminated or failed mass air flow sensor cannot measure the amount of air flow correctly. The MAF sensor is tasked with measuring the amount of air entering the engine at any given RPM.

The sensor contains a pumping cell and a reference cell separated by a. If not youll need to pierce the wires using a pin when conducting your tests. The most common symptoms of a bad MAF sensor are.

Connect the black lead of the multimeter to the ground terminal of the MAF sensor and connect the red lead to the battery positive source or the positive wire inside the MAF sensor connector. The Mass Air Flow Sensors Ground Wire Test. As stated before the mass air flow test is a very easy and simple test but there.

In diesel engines it also controls the exhaust gas recirculation. A professional automotive diagnostic scanner with live data graphing ability. In my Ford van the mass air flow sensor sits right behind the air filter and is easy to reach.

Symptoms Of A Bad MAF Sensor. Probe the GRYBLK wire of the MAF sensor connector with the red multimeter test lead. Remove your engine air filter then locate the MAF sensor somewhere between the filter and the engine.

Set the multimeter to 20 volts. What Does The MAF Sensor Do. Connect to the vehicles computer and stream the MAF grams per second GPS reading.

In some cases though youll need a DMM with a frequency scale depending on. A scan tool comes in handy but you wont need it to use the testing info in this article. Disconnect the connector of the MAF sensor.

You can test the mass air flow sensor with the help of a scan tool. You can get a reading of the MAF sensor with an advanced scan tool. It is an important component in air supply and helps reduce exhaust gas.

Youll need to use a tool like a wire piercing probe to access the signal inside the wire. Circuit Descriptions Of The MAF Sensor Connector. Using an automotive diagnostic scanner you can perform a MAF live test.

How To Know If Maf Sensor Is Bad Mass Air Flow Sensor Test Youtube

Testing A Mass Airflow Sensor Using A Scan Tool Youtube