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Model UT107: OPERATING MANUAL
5. Mass Air Flow (MAF) Sensor (see figure 25)
(figure 25)
Black Red
The sensor converts the air flow into a DC voltage, low
frequency or high frequency signal. The Meter can only
be used to test a DC voltage or low frequency signal.
Testing Procedure:
Connect the DC voltage type MAF sensor in the DC
voltage testing method and set the rotary switch 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.
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.
Turn on the ignition key but do not start the engine.
Displayed Values:
DC Voltage Type Sensor: The displayed value
should be less than or equal to 1V. (The details shall
be based on the parameters furnished by the supplier.)
(1)
(2)
(3)
(4)
Ground
Low frequency MAF Sensor of GM
(General Motor) in 1988 or Before
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