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Thread: LMM Fuel Rail Pressure

  1. #1
    Senior Member
    Join Date
    Jun 2009
    Posts
    180

    Default LMM Fuel Rail Pressure

    Got a new to me 2009 LMM. I wanted to check the health of things so I logged the 8 injector balance rates, along with fuel rail pressure actual versus desired. Problem I'm having is the Fuel rail actual pressure is constantly reading around 18,500psi all the time. At idle or WOT it is the same. Am I logging the wrong pid?

    The other question is I logged the TP%, however it is always at 50%. why? am I logging the wrong PID? what should I be watching to know how much throttle is being given?

    Attached is my tune and log file.

    BTW, is this the correct stock tune file for a 2009 LMM Duramax?
    Attached Files Attached Files

  2. #2
    Senior Member
    Join Date
    Jun 2009
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    180

    Default

    bump this up to get some help.

  3. #3
    Lifetime Member
    Join Date
    Jan 2006
    Posts
    374

    Default

    These are the two you need to log for TPS% and actual rail pressure
    APP
    FRP_C
    04 LB7
    2010 LMM
    2015 LML

  4. #4
    Lifetime Member
    Join Date
    Jan 2006
    Posts
    374

    Default

    Go here https://tis2web.service.gm.com/tis2web
    put your vin in and check the ecm for the correct cal id"s to see if you have the correct file.
    04 LB7
    2010 LMM
    2015 LML

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