Air flow mass meters
An Air Flow Meter, AFM or Air Mass Meter, AMM measures the air flow or air mass that is drawn into the intake of the engine. This measurement is transmitted as a frequency or a variable voltage to the ECM, ECU, or PCM so that it can calculate the correct amount of fuel to deliver via the injectors in relation to the air going into the engine. Other terms used for this sensor are: MAF Sensor, Mass Air Flow Sensor, or Karmen Vortex AFM.
Various designs have been used over the years by different manufacturers to measure the air delivery to the engine, including vane or flap, hotwire, hot film, membrane and karmen vortex type to name just a few.
Injectronics can test, repair, and remanufacture many brands of Air Flow Meter (AFM) and Air Mass Meter (AMM), including Bosch, Siemens, VDO, Hitachi, Mitsubishi, Delco, Delphi, Nippon Denso, Kefico, and Lucas.
Injectronics tests and calibrates all Air Meters using an Air Flow Analyser test bench, which flows air through the meter and precisely checks the output of AMM's and AFM's compared to learnt OEM specifications.