Mass Air Flow (Maf) Sensor - UNI-T UT105 Operating Manual

Measurement Operation(31)
5.Mass Air Flow (MAF) Sensor (see figure 20)
The sensor converts the air flow into a DC voltage, low
frequency or high frequency signal. UT105 can only be
used to test a DC voltage or low frequency signal.
Testing Procedure:
(1) Connect the DC voltage type MAF sensor in the DC
voltage testing method and set the rotary switch of
the meter to 20VDC. Connect the frequency type
MAF sensor in the RPMx10 testing method and set
the meter to the number of cylinders in the automobile.
Now take 4 cylinders (4CYL) for example.
(2) Connect the black test lead probe of the meter to the
ground terminal (i.e. ground strap connection) and
connect the red one as illustrated in figure 21.
(3) Turn on the ignition key but do not start the engine.
Model UT105: OPERATING MANUAL
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