Hi Carl, how you doin?
The number for this item represents the PA3 output or ESC counter. Here is an excerpt from the article I wrote on knock detection awhile back:
"The ECM converts the ESC signal into a number that is determined by the length of time the ESC signal is held low (the duration of the knock). The way it works is, a counter is allowed to count up only while the ESC input is low. This counter is called the ESC PA (pulse accumulator). The longer the knocking occurs, the more time the counter has to count. The higher the count, the greater the retard to the timing. When knocking stops the counter stops,
but the count remains at the last number. This is the starting number for the next knock event. So the program has to keep track of the PA count from the last knock, and subtract it from the PA count associated with a new knock in order to tell the knock severity. The ESC PA can count from 0 to 65,535 and when it gets to the highest count, it goes back to zero and continues counting."
The part in bold is why this is not a useful number. Yes, if the number increases you know a knock event just occured, but unless you logged the before and after values it's difficult to interpret. Also, the ALDL data stream only transmits the high order byte of the 16-bit PA3 value.
I know, you still disagree