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  1. #1
    Fuel Injected!
    Join Date
    Nov 2017
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    Californiacation
    Age
    57
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    834

    LT1 Bench Harness

    Hi Guys/Gals,
    I am getting ready to finish up my bench harness interface and wanted to add the LT1 stuff to it. Here's the pinouts I have so far. It's been so long since I did any LT1 bench stuff I can't remember what I did and can't find my old cable from years ago :( I sort of remember it only using one connector to the PCM though. I like to have the fuel pump sense on my bench setup besides just the MIL cuz if the fuel pump runs and shuts off like normal, pretty much everything else works. Could someone check the two fuel pump pins I noted and let me know for sure? I appreciate any help and/or suggestions.

    LT1 OBD1/2
    Red Pin 2 Ground
    Red Pin 7 Fuel Pump enable to relay +12v out
    Red Pin 25 Fuel Pump enable VATS
    Black Pin 6 Analog Ground
    Black Pin 15 12v Constant
    Black Pin 16 Analog Ground
    Black Pin 28 5v
    Black Pin 29 5v
    Black Pin 30 12v Switched
    Black Pin 31 12v Constant
    Blue Pin 1 Ground
    Blue Pin 3 12v Switched
    Blue Pin 7 Serial Data <<<<< OBD2
    Blue Pin 9 MIL
    Blue Pin 20 Output/Field Service Enable (Diag Port)
    Blue Pin 29 Serial Data <<<<< OBD1
    Blue Pin 30 Serial Data <<<<< OBD1
    Last edited by In-Tech; 04-15-2020 at 08:34 AM. Reason: Pinouts fixed, thanks kur4o
    -Carl

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