Tech Tip Corner
Testing Inductance Crankshaft Sensors
Alternate Method of Testing Variable Inductance Crankshaft Sensors
While the method of testing variable inductance crankshaft sensors
by measuring the resistance of the windings is an accurate method of
testing for open or shorted windings, it does not test for a no signal
condition due to a broken or weak magnet.
Rather than remove the sensor from the block to test magnetic
strength, attach a DVOM set to measure AC voltage across the
terminals of the sensor . With a cranking RPM of 100 @ 70 degrees
F or greater , experience indicates that most variable inductance
crankshaft sensors will generate an AC voltage in the range of .7 to 1<
volt. A voltage in this range or higher would generally indicate the
sensor magnet is OK.
Distributor mounted magnetic pick-ups can also be tested using this
method. Voltage is usually slightly higher.
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