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Title: Knock sensor logging, multiple voltages? Post by: TeknoFi on July 31, 2022, 01:00:51 PM Hello,
i have a 1.8t ajq (audi tt) with two sensors. why do I get four different voltages and how should they be interpreted? each sensor gives one wire to the ecu, so where are the extra voltages coming to the logs? According the logs, cylinders 1+3 and 2+4 give voltage close to each other, and between groups are bigger voltage cap. If the pairs were 1+2 and 3+4, I would melt it into the difference between the sensors, but this is too weird for me. Could someone please explain please. Title: Re: Knock sensor logging, multiple voltages? Post by: fknbrkn on July 31, 2022, 02:23:37 PM Ecu obviously knows when eqch cylinder are firing, no matter how much sensors it has In case of two sensors first logs 1-2 and the second 3-4 cyl. Just for accuracy In general you dont need all of this voltages except to diagnose dead sensor/wiring Title: Re: Knock sensor logging, multiple voltages? Post by: nyet on August 01, 2022, 05:02:53 PM voltages mean literally nothing. They are heavily processed by the ECU.
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