Detonation (Knock) Sensor (Maxima, NX 2.0L, Pathfinder,

Pickup 3.0L, Sentra 2.0L, 240SX & 300ZX)

Basic ignition timing is preprogrammed. Detonation sensor detects engine knocking, converts knocking vibration into voltage signal and transmits it to the ECU. Information is used by ECU to adjust ignition timing accordingly to eliminate detonation.