FLA -30
FUEL SYSTEM
MASS AIR FLOW SENSOR
(MAFS)
INSPECTION
ECF3BEA5
FUNCTION AND OPERATION PRINCIPLE
Mass Air Flow Sensor (MAFS) is a hot-film type sensor
and is located in between the air cleaner and the throttle
body. It consists of a tube, a sensor assembly and honey-
comb cell and detects intake air quantity flowing into the
intake manifold. Air flows from the air cleaner assembly
through the honeycomb cell and over the hot film element.
At this time, heat transfer is generated by convection and
this sensor loses its energy. This sensor detects the mass
air flow by using the energy loss and transfers the infor-
mation to the PCM by frequency. The PCM calculates fuel
quantity and ignition timing.
KFCF1021
SPECIFICATION
Air Flow (kg/h)
Output Frequency (Hz)
12.6 kg/h
2,617Hz
18.0 kg/h
2,958Hz
23.4 kg/h
3,241Hz
32.4 kg/h
3,653Hz
43.2 kg/h
4,024Hz
57.6 kg/h
4,399Hz
72.0 kg/h
4,704Hz
108.0 kg/h
5,329Hz
144.0 kg/h
5,897Hz
198.0 kg/h
6,553Hz
270.0 kg/h
7,240Hz
360.0 kg/h
7,957Hz
486.0 kg/h
8,738Hz
Air Flow (kg/h)
Output Frequency (Hz)
666.0 kg/h
9,644Hz
900.0 kg/h
10,590Hz