Component Description

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The knock sensor (1) is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the ECM.

Engine oil cooler (2)

Fig 1: Identifying Knock Sensor And Engine Oil Cooler
Courtesy of NISSAN MOTOR CO., U.S.A.