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When the tach and dwell are tested in the computer of the automobile, a Hall sensor is used. The
Hall sensor is normally used in the ignition system to detect the position of the camshaft so that the
computer of the automobile can set the optimal time for the ignition and the opening of the fuel
injector.
(1)
Move the Hall sensor out of the automobile and see the details of the operation in various
kinds of automotive manuals.
(2)
Connect the positive pole of a 9 V battery to the source end of the sensor and the negative
pole to the ground end of the sensor by referring the details to the positions of the source and ground
ends of the sensor in various kinds of automotive manuals.
(3)
Set the rotary switch of the meter to
:
. Insert the red test lead into the
:
terminal and the black
one into the
COM
terminal.
(4)
Connect the red and black test lead probes in parallel to the signal connect terminal and
ground end of the sensor and the meter should display a small ohm.
(5)
When a metal plate (blade, steel tape, etc.) is inserted into the concave magnetic pole of the
sensor, the display of the meter will be enlarged or overloaded; if the metal plate is moved away, the
display will become smaller, which proves that the sensor is satisfactory.
72-9280: OPERATING MANUAL
