FAST TECHNICAL VERSION

Knock sensor

A sensor detecting vibration signatures associated with engine knock.

Key facts

Knowledge domainTechnical foundation

Connected categorysensor-families

VerificationSource and vehicle variant are evaluated together

Overview

Knock sensor is evaluated through its operating principle, supply, ground, signal, physical target and controller interpretation.

The test method must match the sensor technology. Power and ground are load-tested, while analogue, frequency or digital signals are compared with scan-tool live data.

Cleaning and installation procedures are sensor-specific; aggressive solvents, physical contact with sensing elements and unverified adjustments are avoided.

Electrical checks

Verify pin functions from a wiring diagram.
Load-test supply and ground.
Compare the physical signal with live data.

Installation and validation

Repeat the original operating condition after repair.

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