Legacy Wagon 4WD F4-2.5L DOHC (1996)
Knock Sensor: Description and Operation
KNOCK SENSOR
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The knock sensor is installed on the cylinder block, and senses knocking signals.
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This knock sensor is a piezo-electric type which converts knocking vibrations into electric signals.
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It consists of a piezo-electric element, weight, and case. If knocking occurs in the engine, the weight in the case moves causing the
piezo-electric element to generate a voltage.