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Turbo6.0L
September 17th, 2017, 06:11 PM
Hello -
Wondering what GM.CKREFCYL cylinder number of reference period is showing when I log it?

Thanks.
joecar
September 17th, 2017, 07:40 PM
Please post log.
Turbo6.0L
September 18th, 2017, 06:32 AM
21505
joecar
September 18th, 2017, 07:20 AM
Looks like it's cyl # (but it's being sampled much slower than the rate the ECM sees the reference pulses).
Highlander
December 6th, 2017, 03:46 PM
what its showing is how quick it sees the teeth. I am guessing this is for misfire diagnostics which would be useful.
PLohr
December 16th, 2019, 01:13 AM
Trying to understand if individual cylinder firings can be logged with GM.CKREFCYL. Please feel free to correct me on any of this.

I am working with EFILive Scan V7.5.

If Scan Mode (Edit menu -> Properties -> Logging tab) is set to Stream-Fast, we can log 10 frames per second (or 600 frames per minute).
If engine speed is greater than 600 RPM (and it usually is), we can't log every GM.CKREFCYL event so some events will be missing.
So GM.CKREFCYL will not be consecutive cylinder firings since we are missing some?

Also, do the values 0 through 7 correspond to cylinder numbers 1 through 8? 0=1...7=8?

Thanks for any help.
joecar
December 20th, 2019, 06:56 AM
Do you have a log I can look at...?
PLohr
July 7th, 2020, 10:19 PM
Thank you, joecar. Sorry that it took so long to get back to you. I'm not sure that I logged all of the needed parameters in this file.

23399
joecar
July 13th, 2020, 04:57 AM
No worries.

Log file E38_0004.efi does not contain the pid GM.CKREFCYL...???

GM.CKREFCYL shows the count of how many times the ECM saw the crank reluctor reference position (i.e. the missing 2 teeth on the 58x reluctor).
PLohr
July 13th, 2020, 05:14 AM
No worries.

Log file E38_0004.efi does not contain the pid GM.CKREFCYL...???

GM.CKREFCYL shows the count of how many times the ECM saw the crank reluctor reference position (i.e. the missing 2 teeth on the 58x reluctor).

I will take another log and get back with you. Sorry about that.
PLohr
January 19th, 2021, 09:36 AM
joecar,

I was not able to find CKREFCYL. This really needs to be a new post, and I can do that if you like.

I am on to another issue, trying to chase down a cold start misfire. I want to log MFCYL*C. But the values remain at zero. Do these not get monitored all the time? Or perhaps I am doing something wrong. Thank you for any help.
PLohr
January 21st, 2021, 02:10 AM
I posted a new thread about this here:
https://forum.efilive.com/showthread.php?29897-misfire-logging&p=254023&viewfull=1#post254023