A knock sensor is a device used in internal combustion engines to detect the presence of knocking, a condition that occurs when the air-fuel mixture in the engine ignites prematurely. Knocking can damage the engine, so it is important to be able to detect it and take corrective action. There are a few different ways to test a knock sensor, and the most common method is to use an oscilloscope.
To test a knock sensor with an oscilloscope, you will need to connect the oscilloscope to the sensor’s output terminal. Then, start the engine and let it idle. You should see a waveform on the oscilloscope that corresponds to the knocking. If the waveform is not present, then the sensor is not working properly and should be replaced.
