How do knock sensors work / how to test?
07-10-2005 | 09:58 PM
#1
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Joined: Jan 2004
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From: South of the North Pole
How do knock sensors work / how to test?
Have knock sensors on the boat I am buying. In the sea trial, I never saw one move. That might be a good thing, if they are working. How can you / do you test them? These are Gafrig gages.
07-11-2005 | 06:45 AM
#2
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From: Aurora Ontario
Re: How do knock sensors work / how to test?
Knock sensors are a piezo electric crystal signal generator. The vibration, at the correct frequency causes the crystal ti vibrate and generate a small electrical signal. this signal then shows on the scan tool or dash readout after being modified by the computers electronics. Test by tapping the bolck with a small hammer near the sensor.
