Automotive Glossary

Automotive Glossary

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Knock signal from an engine knock sensor to the ECM.


Advanced or quick detonation of fuel in a cylinder where the resultant pressure rise causes a shock wave through the piston, crankshaft and engine block.

Knock Sensor

A piezoelectric sensor used to provide sensor signals to an ECM when an engine is knocking. A closed loop control retards the ignition to prevent knock.


Used to describe engine knock or a noise produced that sounds like one object hitting another.


Knowledge is defined by the Oxford English Dictionary as (i) expertise, and skills acquired by a person through experience or education; the theoretical or practical understanding of a subject; (ii) what is known in a particular field or in total; facts and information; or (iii) awareness or familiarity gained by experience of a fact or situation.

Knuckle (Steering)

Steering stub axle assembly. Also known as a steering swivel.


''Key On, Engine Cranking''


''Key On, Engine Off''


''Key On, Engine Running''

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