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Thread: LBZ - Rescaling MAP Sensor in EFI Live

  1. #1
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    Question LBZ - Rescaling MAP Sensor in EFI Live

    In the middle of "adjusting" an LBZ truck with a larger VGT for sled pulling. The log files show the MAP sensor is maxing out at 39.01psi (NOT including barometer pressure). I was talking to the owner and we were thinking of installing a 5 bar MAP sensor, 0-5V, adapted so it could be read through the factory harness. I have seen in other forum post (https://www.duramaxdiesels.com/forum...scaling.71271/) where .cax (or .cax8) files were added to enable rescale the MAP sensor, but none done for the LBZ. I know on the LLY's you can adjust the B0202 easily for this, but that table was remapped for altitude in the LBZ. Truck is currently running the 52604138 OS.

    Any thoughts?

  2. #2
    svvag200
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    principle is same
    but unfortunately efilive does not offer a pressure sensor linearization map
    and in LLY control unit dump adress different

  3. #3
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    [B3499]
    ; Description
    ; --------------------------------------------------------------------------------------------------
    DESC.001 = MAP Sensor Scaling
    DESC.002 =
    DESC.003 = This is used for aftermarket Manifold Absolute Pressure sensors that have a
    DESC.004 = different range than the stock sensor. With the right sensor, it allows logging
    DESC.005 = higher boost values than the stock sensor could handle.
    ; Seg Caption Major Minor Vis Dis 2d Grp
    ; --- -------------------------------- ---------------- ----- --- --- -- ---
    VIEW = 2 "MAP Sensor Scaling" "Engine Sensors" "" 1 2 0 0
    ;
    ; Address(es) BitOff Bits Typ Inv
    ; -------------------------------- ------ ---- --- ---
    ADDR = 1B6DEE 0 16 SNM 0
    ;
    ; Units Factor Offset Prec MinLimit MaxLimit MinUser MaxUser
    ; ----- ------ ------ ---- -------- -------- ------- -------
    SI_SLOT = kPa 0.1 0 2 0 3276.7 0 3276.7
    ;
    ; Units Factor Offset Prec MinLimit MaxLimit MinUser MaxUser
    ; ----- ----------- ------ ---- -------- -------- ------- -------
    IM_SLOT = PSI 0.014503768 0 2 0 475.2 0 475
    ;
    ; Body Col Row
    ; -------------- -------------- --------------
    ULABELS = . . .
    ;
    ; Enumerations
    ; ---------------------------------------------------------
    SI_ENUM = .
    IM_ENUM = .
    ;
    ; Units Labels
    ; ----- ------------
    SI_COL = kPa "kPa"
    IM_COL = PSI "PSI"
    SI_ROW = mV "156.4,5000"
    IM_ROW = mV "156.4,5000"
    ; ================================================== =============================
    Last edited by koolky; April 18th, 2024 at 04:06 AM. Reason: address corrected

  4. #4
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    Hello, I am wondering if this is normal readout for the factory sensor scaling. It seems off to me.Click image for larger version. 

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  5. #5
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    Quote Originally Posted by THAHN View Post
    Hello, I am wondering if this is normal readout for the factory sensor scaling. It seems off to me.Click image for larger version. 

Name:	Sensor Scaling.PNG 
Views:	374 
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ID:	24566
    Stock sensor should read 366 Kpa at 5000mv. Yes its wrong.
    2016 LML

  6. #6
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    Thank you. That is what I thought. I used the same CAX file as shown. Any idea how to get the correct readings?

  7. #7
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    I tried it on a stock LBZ file I had and got the same numbers. The factors look good. I would suspect its a bad address. Maybe scaling for the Baro Sensor?
    Last edited by Woody35; January 25th, 2024 at 12:34 PM.
    2016 LML

  8. #8
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    Thank you for the help. If the address isn't correct do you happen to know the correct one? Otherwise does anybody else know what that address might be? Thanks

  9. #9
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    Going to need a Bin and a “treasure map” to find the correct address. Unfortunately I do not have those.
    2016 LML

  10. #10
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    I figured it would come down to needing that. If anyone out there could lend a helping hand it would be appreciated. Thank you

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