Last updated: September 01, 2017

MAF/MAP knowhow

What do MAF/MAP sensors do?

MAF/MAP sensors carry out two important functions within the Engine Management System.

MAF sensors determine the mass of air flowing through the engine’s air intake system. Supplying this information to the engine management system enables it to control the fuel air mix needed by the engine to operate efficiently.

On both diesel and petrol engines the Mass Air Flow sensor is situated between the intake manifold and air filter.

MAF MAP only

MAP sensors measure the absolute pressure inside the intake manifold or charge pipe of the engine.

The sensor is located in air intake system (downstream of throttle in petrol engines).

Pressure varies depending on throttle position, engine speed and turbo operation – the load or how hard the engine is working
Air pressure is measured to make calculations for fueling and ignition calibration vital to maintaining engine efficiency
Pressure is below atmospheric for most of the engine operating conditions, close to atmospheric at WOT (wide open throttle) and above atmospheric when turbo on boost.

As atmospheric pressure varies with altitude and even weather conditions, to maintain the accuracy required, the MAP sensor measures manifold pressure relative to a vacuum (absolute zero) held inside the sensor.

Supplying this information to the engine management system enables it to control the fuel air mix needed by the engine to operate efficiently.

The name you can trust

As with all NGK/NTK products, MAF/MAP sensors undergo extensive testing at the factory R & D centre in Japan prior to release into the range to ensure all items meet the OE vehicle manufacturer’s specifications.

Testing includes:- Vibration/frequency sweeps, Thermal shock, Pollution testing, Electrical performance, Over-voltage and Impact testing

Want to know more?

MAF/MAP sensors are an integral part of the engine management system so it’s handy to know your way around them. That’s why we’ve put together this simple driveby guide to give you the knowhow you need. Click here to view or download for later

MAFMAP KNOWHOW