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Structure and inner electrical connection

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The signal is converted by a Piezo-ceramic disc. Pressure forces within the ceramic lead to a load shift that causes a voltage. This voltage is picked up by contact discs.

Fig 1: Knock Sensor - Circuit Diagram
G09909937Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Knock sensor
PIN REFERENCE

Pin Explanation
SIG1 Differential signal 1
SIG2 Differential signal 2