What is the voltage of the BMW N20 knock sensor?

[AliyahRose]

The knock signal voltage of the BMW N20 knock sensor is 18 volts. Knock Sensor: The knock sensor is installed in the middle of the engine block. For a four-cylinder engine, it is installed between cylinders 2 and 3. It is used to measure engine vibration and adjust the ignition timing when engine knock occurs. Function of the Knock Sensor: The knock sensor transmits engine knock signals in the form of electrical signals to the electronic control module, serving as a critical basis for the module to adjust ignition timing and prevent further knock. Knock sensors are typically piezoelectric ceramic types. When the engine vibrates, the ceramic inside is compressed, generating an electrical signal. When vibration or knocking occurs, it produces a small voltage peak. The greater the knocking or vibration, the larger the peak voltage generated by the knock sensor.