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Knock sensor question

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    Knock sensor question

    How does the DME know if the knock sensor is there or not? Is there a reference voltage that it sends to the sensors or some other type of feedback?

    On my S52 OBD1 swap, both sensors show a common ground, with each having it's own input location to the DME. The DME says the rear sensor is having a problem, with the CEL coming on. It's a new sensor, less than 500 miles since I got it running.

    Before I go out an buy another one I'd like to see if there are any other things to check...
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