Inductive Sensor
An inductive sensor generates its own alternating voltage when metal teeth pass a magnet and coil.
What is Inductive Sensor?
It needs no power supply. It is common on older crankshaft and ABS sensors. Signal strength increases with speed. On a scope, an inductive sensor shows a sine-like wave whose amplitude and frequency rise with speed. A missing tooth on the reluctor creates a recognisable gap used as a reference point.
How it works
Teeth change the magnetic field, inducing voltage in the coil.
Why it matters for your car
At very low speed the signal may be too weak. Air gap and cleanliness affect the signal.
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