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h38 knock sensor.pdf

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H38 KNOCK SENSOR
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Knock Sensor The Knock Sensor detects engine knock and sends a voltage signal to the ECM. The ECM uses ?the Knock Sensor signal to control timing. ?Engine knock occurs within a specific frequency range. The Knock Sensor, located in the ?engine block, cylinder head, or intake manifold is tuned to detect that frequency. ?Inside the knock sensor is a piezoelectric element. Piezoelectric elements generate a voltage ?when pressure or a vibration is applied to them. The piezoelectric element in the knock sensor ?is tuned to the engine knock frequency. ?KNOCK SENSORSPage 1 ? ? Toyota Motor Sales, U.S.A., Inc. All Rights Reserved.The vibrations from engine knocking vibrate the piezoelectric element generating a voltage. The ?voltage output from the Knock Sensor is highest at this time. ?KNOCK SENSORSPage 2 ? ? Toyota Motor Sales, U.S.A., Inc. All Rights Reserved.ASSIGNMENT NAME: ___________________________ 1. ?What is the purpose or function of a Knock Sensor? 2. ?Explain how the PCM (ECM) uses the Knock sensor input signal? 3. ?Where are Knock sensors usually located? 4. ?Explain the construction of a Knock Sensor? 5. ?Draw a scope pattern of a Knock Sensor? KNOCK SENSORSPage 3 ? ? Toyota Motor Sales, U.S.A., Inc. All Rights Reserved.

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