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Thread: PFN LIST ERROR V7.5 SCAN TOOL - help !

  1. #1
    Junior Member
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    Default PFN LIST ERROR V7.5 SCAN TOOL - help !

    Hey guys

    Been having a few issues of late with the v7.5 scan tool showing delayed data , you can datalog a car then switch the ignition off and the data will still keep recording for sometimes up to 1 minute after key off .
    I have this on 2 different laptops.

    The latest issue, I will be data logging and suddenly the p.c will freeze , and I will get a blue screen with "PFN LIST ERROR" - again , this happens on 2 different laptops with 2 different efilive V2's

    Any clues ? memory management ?
    8gb ram on both of these on Win 10 64

  2. #2
    Joe (Moderator) joecar's Avatar
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    In the scatool, go Help->About and post here the build version.

  3. #3
    EFILive Developer Site Admin Blacky's Avatar
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    The V7 scan tool is single-threaded which means the data logging and the screen update/refresh is done in the same thread on a single core. That can cause the thread to start lagging if it has to draw too many updates. You can reduce the amount of screen update/refreshes by forcing the V7 software to only update the display every "N" frames of data logged. Updating the screen every 4 frames is usually a good compromise, like this:

    Click image for larger version. 

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    Note: The V78 scan tool is multi-threaded and does not suffer from this type of lagging.
    Before asking for help, please read this.

  4. #4
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    Quote Originally Posted by joecar View Post
    In the scatool, go Help->About and post here the build version.
    Hey Joe
    Did it on V7.5.28 and getting the same problem on V7.5.30

    Blacky
    The V7 scan tool is single-threaded which means the data logging and the screen update/refresh is done in the same thread on a single core. That can cause the thread to start lagging if it has to draw too many updates. You can reduce the amount of screen update/refreshes by forcing the V7 software to only update the display every "N" frames of data logged. Updating the screen every 4 frames is usually a good compromise, like this:
    Thanks Blacky , totally understand that V8 is the next step forward but I have used V7.5 for 10 yrs with no issues whatsoever, now this.
    I asked about this lag once before and had no real improvement even after turning down the update rate.
    It seems to only do it on E38 ecu , E40, LS1 and E67 is seemingly not affected.
    never really got the PFN error before until now either

  5. #5
    Lifetime Member Tre-Cool's Avatar
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    I have seen this on my old laptop.

    It turned out to be cpu power/thermal mgmt as the cpu clock being wound back. Was a pain in the ass as it would do it when i had the external battery pack plugged in.

    Easy thing to check, download cpuid & see what the clock speed & multiplier are at when your on mains vs battery.

    Click image for larger version. 

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    I'm currently using a laptop as old as my last one, as i get them from the throw out pile at work. lol. pulled my hard drive out and whack it in this one and away i go.

    the last one was pulling cpu speed down to like 800mhz when on battery.

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