Detonation sensor: A sensor, which is often piezoelectric, mounted near the cylinders which can detect engine knocking or frequencies of detonation so as to send a message to the ECU to retard the ignition timing to prevent damage to the engine. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous PostDetonation Next PostDiagnostic code