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Thread: M276 Knock Sensor Cyl Values

  1. #1
    Potential Tuner
    Join Date
    Dec 2020

    M276 Knock Sensor Cyl Values

    Hi all,

    Trying to make sense of Knock Sensor Cyl outputs. It's given in voltage, which makes sense but the values range from 4-10v when idle/normal throttle, at WOT it's hitting 70v. So obviously it's not actually in volts. There's also a Knock Intensity reading which stays at 0. I'm getting no timing retard so I don't think there's any actual knock but I'd like to be able to interpret this output.


  2. #2
    Tuner in Training
    Join Date
    Apr 2021
    I'm guessing it is some sort of probability or other stepping. I'm guessing something over 70 means there is knock, maybe 100?

  3. #3
    Potential Tuner
    Join Date
    Jul 2021

    Actually, voltage is like "volume/sound" (almost like decibel). It is not the knock. The ecu will try to hear sharp spikes from the engine noises. You can reduce noises by adjusting a cylinders pressure with the vvt.