MAC TOOLS EM721 Manual Del Usuario página 52

Primary Windings Resistance Test
This test checks for resistance in the primary windings of conventional and DIS (distributorless) ignition coils.
Meter setup to measure resistance in the primary windings of ignition coils:
•
Set the rotary switch to resistance (Ω ) setting.
•
If " " is present on the display, press the "DWL" button until " " disappears.
•
Insert the black lead in the "COM" jack.
•
Insert the red lead in the "
Disconnect the coil from the ignition system.
Connect:
•
Black test probe to the negative (-) terminal on the coil.
•
Red test probe to the positive (+) terminal on the coil.
NOTE:
Both primary connections are located on the back of Type II coils.
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Black
Black
Red
GM DIS
Conventional
Ignition Coil
Ignition Coil
(TYPE II)
" jack.
Red
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