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Thread: E67 PID GM.CKREFCYL what is it showing?

  1. #1
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    Default E67 PID GM.CKREFCYL what is it showing?

    Hello -
    Wondering what GM.CKREFCYL cylinder number of reference period is showing when I log it?

    Thanks.

  2. #2
    Joe (Moderator) joecar's Avatar
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    Please post log.

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  4. #4
    Joe (Moderator) joecar's Avatar
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    Looks like it's cyl # (but it's being sampled much slower than the rate the ECM sees the reference pulses).

  5. #5
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    what its showing is how quick it sees the teeth. I am guessing this is for misfire diagnostics which would be useful.
    "All that is needed for the triumph of evil is that good men do nothing..."

  6. #6
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    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.

  7. #7
    Joe (Moderator) joecar's Avatar
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    Do you have a log I can look at...?

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    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.

    E38_0004.efi

  9. #9
    Joe (Moderator) joecar's Avatar
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    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).

  10. #10
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    Quote Originally Posted by joecar View Post
    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.

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