15
automobile.
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If a DIS ignition system without any distributor board
is used in the automobile, connect the red test lead
probe to the TACH (tachometer) signal line (which is
connected to the computer DIS module of the
automotive engine). Refer to the automotive
servicing manual for the specific position.
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If an ignition system with a distributor board is
used in the automobile, connect the red test
lead probe to the primary negative end of the
ignition coil. (Refer to the automotive servicing
manual for the specific position.)
·
Upon the start of the engine or during its operation,
test the rotation speed of the engine and read the
displayed value from the display. The unit is “x10RPM”.
Dwell Testing
It was very important in the past to test the dwell of the
cut-off switch of an ignition system. The dwell testing
means the duration when the cut-off switch remains off
when the cam is turning. Now as an automobile is ignited