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If you back probe the sensor wires with a meter that can graph in frequency (Hz) then tap on the engine block right next to the Nock sensor with some kind of metal (Keys on a key chain seem to work a lot of the time) you should see a response on the meter in any kind of reading other than a straight line. This would indicate responce from the sensor and show it was working.

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โˆ™ 2006-03-16 23:53:48
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Q: How can you tell if the knock sensor is not working correctly on a 91 Toyota 3.0?
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