Knock Sensor Fequency ?
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C409 (06-15-2020)
06-15-2020, 12:13 PM
#3
Drifting
06-15-2020, 02:06 PM
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06-15-2020, 04:34 PM
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Drifting
06-15-2020, 07:40 PM
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Yup. IIRC, the IC in the center there was reasonably unchanged over the years. Comparing the substrate/board layout here with one of the earlier ESC modules would make it reasonably straightforward to find the common signal/supply/ground runners and pins.
06-16-2020, 03:41 AM
#8
Drifting
Are you positive? I found a datasheet listing specs for various knock modules across GM's lineup, and the frequency for the L98 is listed as 5000 Hz. The LT1 is listed as 5200 Hz, and the LT5 at 6000 Hz.
06-16-2020, 02:10 PM
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Thank you for the clue! While all I have is this one junk LT1 module laying around, that did get me looking at modules from the earlier MEMCAL cars, and stumbled onto someone who wired an $EE knock module into a $DA3 MEMCAL, so that gave me a pretty good clue as to at least what four of the pins were for. It also led me to my next odd finding.
Are you positive? I found a datasheet listing specs for various knock modules across GM's lineup, and the frequency for the L98 is listed as 5000 Hz. The LT1 is listed as 5200 Hz, and the LT5 at 6000 Hz.
Are you positive? I found a datasheet listing specs for various knock modules across GM's lineup, and the frequency for the L98 is listed as 5000 Hz. The LT1 is listed as 5200 Hz, and the LT5 at 6000 Hz.
Is there something from any of my previous posts that cause you some concern regarding the accuracy of my comments regarding this topic?
06-17-2020, 12:32 AM
#10
Drifting
Instead, I would only ask for your opinion on a few additional items, your answer being the case. The first is a purported chart of knock module specifications. The others are purported pinouts for the knock module that don't match one another (one being a pinout, the other being someone who apparently successfully connected an LT4 module to their $DA3 MEMCAL). If there's anyone who can shed light on them, it's you, and that's precisely why I asked.
https://imgur.com/a/EOvFFcl
06-17-2020, 11:52 AM
#11
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Not concern, per se--but an honest request for clarification. I meant no insult or disrespect if that's how it came off.
Instead, I would only ask for your opinion on a few additional items, your answer being the case. The first is a purported chart of knock module specifications. The others are purported pinouts for the knock module that don't match one another (one being a pinout, the other being someone who apparently successfully connected an LT4 module to their $DA3 MEMCAL). If there's anyone who can shed light on them, it's you, and that's precisely why I asked.
https://imgur.com/a/EOvFFcl
Instead, I would only ask for your opinion on a few additional items, your answer being the case. The first is a purported chart of knock module specifications. The others are purported pinouts for the knock module that don't match one another (one being a pinout, the other being someone who apparently successfully connected an LT4 module to their $DA3 MEMCAL). If there's anyone who can shed light on them, it's you, and that's precisely why I asked.
https://imgur.com/a/EOvFFcl
)I've got the filter specs on the ESC units during the C4 run, but I neglected to keep any connector/pinout drawings (other than the L83/L98 ESC modules), so I can't currently make a comment on the accuracy of the pinout drawing in that link. As I mentioed earlier, I suspect the pinouts could be figured out several ways, one being to compare the common runner traces on the ESC circuit board layouts over the years.
06-17-2020, 01:16 PM
#12
Drifting
I'm amused at the chart you posted. It was composed by one of my co-workers, and I thought that there was probably only about four copies still in existence, one of which is in front of me. (I suspect I know which of my other co-workers eventually uploaded it onto some car site. )
I've got the filter specs on the ESC units during the C4 run, but I neglected to keep any connector/pinout drawings (other than the L83/L98 ESC modules), so I can't currently make a comment on the accuracy of the pinout drawing in that link. As I mentioed earlier, I suspect the pinouts could be figured out several ways, one being to compare the common runner traces on the ESC circuit board layouts over the years.
)I've got the filter specs on the ESC units during the C4 run, but I neglected to keep any connector/pinout drawings (other than the L83/L98 ESC modules), so I can't currently make a comment on the accuracy of the pinout drawing in that link. As I mentioed earlier, I suspect the pinouts could be figured out several ways, one being to compare the common runner traces on the ESC circuit board layouts over the years.
Again, thank you so much for sharing your wealth of knowledge!
