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I would like to think that a PCM will never diregard the input from the knock sensor. it is a critical piece of information that the PCM needs to calculate various bits of information. Not to mention with this information, during detonation, the PCM can save you from burning a whole in a piston, by removing timing advance.

The PCM disregards the knock sensor input on a 2002 Chrysler 300M during idle. Once the engine speed exceeds a specified value, the PCM will receive input from it and knock retard or advance will be allowed. Knock retard uses it own short and long term memory programs allowing this to happen.

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Q: On a 2002 Chrysler 300M the pcm diregards the knock sensor input during wide open throttle idle heavy deceleration or does it ever disregard the signal?
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