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Magnetic Position Sensor (Pulses) Test
This test checks for pulses from a magnetic distributor pickup to determine if the reluctor wheel or the
magnetic pickup is bad.
Black
Meter setup to check pulses from a magnetic pickup:
• Set the rotary switch to voltage ( ) setting.
• Press the “DC/AC” button until “ ” appears on the display.
• Insert the black lead in the “COM” jack.
• Insert the red lead in the “ ” jack.
Disconnect the distributor from the ignition module.
Connect:
• Test probes to the sensor output leads.
Watch the bargraph change. When the engine is cranked, pulses should appear on the bar graph.
No pluses will appear if the reluctor wheel or the magnetic pickup is bad.
NOTE: Clearance between the pickup and the reluctor is very critical. Be sure to check it according to the
manufacturer’s specications.
On GM cars, remove the distributor cap to access the pickup and the reluctor.
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