How to Install Ak and N Air Filter
Mass Airflow Sensors
A variety of methods of monitoring airflow have been used in production vehicles over the years, including now-outdated van airflow meters, Karman Vortex airflow meters, and speed density systems that rely on a host of engine sensors to determine airflow. The most common systems today use either a hot-wire or a hot-film mass airflow (MAF) sensor. A hot-wire or hot-film MAF sensor allows the electronic control module (ECU) to directly measure intake air temperature, humidity, and air density. A hot-wire MAF sensor features a thin platinum wire located in the airstream that is heated to a programmed temperature using a reference voltage of around 5V supplied from the ECU. As intake air passes the wire, the wire is cooled, resulting in a change in resistance. As the wire temperature drops, the voltage changes. The ECU sees this drop and manages the voltage signal for operating conditions. Based on the required voltage changes, the ECU is able to determine the quality of the air mass.
This MAF sensor is mounted to a section of air intake ducting. A hot-wire or hot-film MAF sensor allows the ECU to directly measure intake air temperature, humidity, and air density. A hot-wire MAF features a thin platinum wire located in the airstream that is heated to a programmed temperature using a reference voltage of around 5V supplied from the ECU. As intake air passes the wire, the wire is cooled, resulting in a change in resistance. As the wire temperature drops, the voltage changes. The ECU sees this drop and manages the voltage signal for operating conditions. Based on the required voltage changes, the ECU is able to determine the quality of the air
A hot-film MAF sensor operates in a similar manner, featuring a heated film. One side of the film maintains a constant reference temperature, while the other side is exposed to intake air. The difference in temperature allows the ECU to determine incoming air quality. The ECU uses this information, in combination with other sensors, to determine fuel injection delivery.
Dirt, oil, spider webs, etc. can contaminate a MAF sensor wire (or film). If the MAF sensor is contaminated by oil, the cause is usually oil vapor from the PCV system in terms of blowby oil that makes its way past the piston rings.
A MAF sensor is located between the air intake/filter and the throttle body, and it measures the flow rate of air that enters an engine. Note the platinum wire in this MAF sensor. Foreign matter easily contaminates these fragile wires. Never assume that a MAF sensor is faulty. Inspect the contact terminals to make sure that the connector is fully seated. That is first thing you can do to make sure it is operating
It's recommended that you clean the MAF sensor every time you service your air filter. The MAF sensor is located in the engine air duct, between the air box and the throttle body. The sensor is generally secured with two screws. Disconnect the wiring harness connector from the sensor and remove the sensor. Do not touch the platinum wire or film with your fingers. This can leave residue on the sensor wire surface. Clean the sensor air passage and wire using only a MAF sensor cleaner spray. Don't use a brake cleaner or other type of solvent, as this can damage or further contaminate the sensor. Once the sensor is dry, re-install it. A fouled MAF sensor can cause a rough idle, hesitation, or poor performance at wide-open throttle (WOT).
How to Install Ak and N Air Filter
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