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Can you tell me whats going on with your Crown Vic?
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The vehicle speed sensor produces an AC signal. It does not receive voltage because it generates it own voltage.
It is a gray wire with black stripe.
Between 30 and 90 ohms.
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It sounds like you have a faulty sensor.
I dont think your testing it correctly.
Also, the wires going to and or from the sensor could be open causing this condition.
AC voltage is different than ohms