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Thread: What PID to scan commanded afr & injector duty cycle for e78

  1. #11
    Lifetime Member wesam's Avatar
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    Thanks a lot
    EFILive Tuner

  2. #12
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by wesam View Post
    The pids for pulse width are GM.INJPWB1 and GM.INJPWB2
    Copy attached calc_pids.txt to folder My Documents\EFILive\V7.5\User Configuration

    Then select the following pids:
    - GM.INJPWB1 and GM.INJPWB2,
    - CALC.INJDCB1 and CALC.INJPWB2,

    and post a log...

    sanity check:
    GM.INJPWB1 and GM.INJPWB2 should range up to ~16 ms at 6000 rpm,
    at which time CALC.INJDCB1 and CALC.INJDCB2 should be somewhere around ~80%.
    Attached Files Attached Files
    Last edited by joecar; August 21st, 2012 at 12:55 PM.

  3. #13
    Lifetime Member wesam's Avatar
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    Thaaaaaaaaaanks very much Joe its working
    should i replace the calc_pids file eac time i update my software ?
    I attached a log for E38
    Attached Files Attached Files
    EFILive Tuner

  4. #14
    Joe (Moderator) joecar's Avatar
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    Yes, you will need to save the calc_pids.txt file and any time you do a software update copy it back to that folder.

  5. #15
    Lifetime Member wesam's Avatar
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    Joe are you sure that this pid is accurate and will work with aftermarket bigger injectors because in one of my old logs the IPW was 78 ms not 16 ms as you stated before
    EFILive Tuner

  6. #16
    Joe (Moderator) joecar's Avatar
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    If GM.INJPWB1 and GM.INJPWB2 are the correct injector pulsewidths that the ECM is commanding, then the calc pids are correct, they use the well known duty cycle formula.


    Code:
    *CLC-00-011
    %                  0           100         .1  "{GM.INJPWB1}*{SAE.RPM}/1200"
    
    *CLC-00-012
    %                  0           100         .1  "{GM.INJPWB2}*{SAE.RPM}/1200"
    
    
    *PRN - Parameter Reference Numbers
    
    CALC.INJDCB1               F011 CLC-00-011   %                Fuel             "Injector Duty Cycle Bank 1"
    CALC.INJDCB2               F012 CLC-00-012   %                Fuel             "Injector Duty Cycle Bank 2"

  7. #17
    Joe (Moderator) joecar's Avatar
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    The 78 ms you saw would have been at a lower rpm...

    the formula for maximum injector pulsewidth: maxpw [ms] = 2*60*1000/rpm

    from this formula you can see that maxpw drops as rpm increases (so at 6000 rpm, maxpw is 20 ms);


    note that 78 ms = 2*60*1000/1539 (i.e. 78 ms would be the maximum pulsewidth at 1539 rpm), so you could have seen 78 ms at this rpm or below.

  8. #18
    Lifetime Member wesam's Avatar
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    Joe I need PID to scan the commanded air fuel ratio
    I tried E78.AFRATIO_DMA but its not working
    EFILive Tuner

  9. #19
    Joe (Moderator) joecar's Avatar
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    Hi wesam,

    what does it do, does not log that pid...?

    does this happen when you log from V7 scantool or from V2 BBx...?

    I take it your on V7 build 211 and V8 build 203.

  10. #20
    Lifetime Member wesam's Avatar
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    I'm on V7 build 211 and V8 build 203
    Its showing wrong numbers when logging
    check this log
    Log_0134.efi
    EFILive Tuner

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