A Knock Sensor is usually mounted to the vehicle's engine, near the combustion chamber so it can detect knocking, or "pre-detonation".
The sound of the knocking can be described as a marbel hitting metal, and it can damage the inside of the engine, including valves, pistons, rods and more.
When the air fuel ratio detonates early, instead of combusting at the proper point of ignition; this produces a knocking sound. The knock sensor commonly has a "piezo crystal" which vibrates as a reaction to the knock pressure waves, and its vibration induces an electrical signal. Thats why you dont have to supply any voltage to it
Connect the knock sensor to an oscilliscope.
Gently tap the knock sensor and observe the waveform.
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