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no current to knock sensor 200 1989

posted by  Jorrell on  Sat Nov 27 15:37 CST 2010
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last visit: Thu Dec 27 03:00 CST 2012
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The knock sensor does not require a current to operate as it is a piezoelectric "microphone" that converts mechanical motion/noise into a voltage spike. I suspect the ECU provides a "bias voltage" so that it's input circuitry can appropriately "interpret" the spikes.

The above being said, one possibility is that someone plugged the wrong sensor/part into the wrong harness connector. The temp sensor, cold start injector, and knock sensor use physically identical connectors and are close enough to one another that they could be easily swapped, especially after an intake manifold gasket replacement job.

Check the wire colors to make sure the right connectors are going to the right place.

jorrell
--
92 245 299.3K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!






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New no current to knock sensor [200][1989]
posted by  yodellin' cowboy  on Sat Nov 27 13:51 CST 2010 >


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