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Thread: LS1 PCM COS3 Not Reading Boost After Software Upgrade. Anyone else?

  1. #1
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    Default LS1 PCM COS3 Not Reading Boost After Software Upgrade. Anyone else?

    Thanks for taking a look guys. I've got a 2003 vette running COS3 with a 2 bar map sensor properly scaled. This exact tune was reading boost before I upgraded to a newer version of software. Granted it was a few months ago that the car was tuned but now for no reason I can't read boost. File attached if you need to see it.

    I've resorted to throwing various other tunes into spare ecms I have and powering them up in my personal vehicle. They are all doing the same thing. I've also changed out the MAP Sensor for another 2 bar and I get the same results. I changed the scaling on the map sensor ( C6301 ) back to a 1 bar scaler number and I can watch the car with Key On Engine Off read around 48 and as I increase boost toward 15 lbs I can see it go up towards 90. That tells me there is nothing wrong with the sensor or wiring. To me that only leaves the software.

    I'm desperate for any and all suggestions.

    Thanks for your time.

    Randy

    Read Stroker Tune_0000.ctz

  2. #2
    Joe (Moderator) joecar's Avatar
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    Randy, post your log files.

    Which kPa pids are you logging...?

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    SAE Like the COS Upgrade says. But I did try everything that was related to MAP and still nothing.

    I've done a lot of these Joe. First time I've ever seen this.

  4. #4
    Joe (Moderator) joecar's Avatar
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    Try doing a full flash of your current tune file.

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    I've done that a dozen times and I get the same result.

  6. #6
    Joe (Moderator) joecar's Avatar
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    Try logging these pids, let see what the PCM is doing:
    - SAE.MAP
    - GM.MAP
    - GM.MAP2
    - GM.MAP3
    - GM.MAP4
    - GM.MANVAC
    - GM.MAPBOOST_DMA
    - GM.MAPU
    - GM.MAPV
    - SAE.BARO
    - GM.BARO
    - GM.BOOST
    - GM.BOOST_DMA
    ( some of those have units "Volts" )

  7. #7
    Lifetime Member GMPX's Avatar
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    Randy, I don't remember on the LS1 PCM but is there another PID related to MAP? Something like GM.MAP and not an SAE PID? (Edit, Joe just posted some MAP alternative PID's to try)
    We did have to make some changes to the SAE.MAP PID recently as the set up of that PID was changed by GM. It shouldn't have affected anything but there might be something funny going on.
    I no longer monitor the forum, please either post your question or create a support ticket.

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    I just finished loading a laptop that has never had efi live on it before. V7.5.7 ( Build 309) I'm going to do a full flash of that vette file I did over a year ago. I'll pull it off my tuning laptop without opening it and copy to the new laptop and then do a full flash and see what happens.

    I'll also log all the pid Joe suggested even though I have tried a few of them already. I want to be very thouough so we don't miss anything. I've been beating my head against the wall for 2 full days before I asked for help.

    Thank you. Give me 20 minutes.

  9. #9
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    Guys,

    Same results. I'm totally lost. The new computer had nothing on it like cax files or anything.

    I was only able to log the additional pid baro. All the others were grayed out.

    Baro was showing 99 at Key On Engine Off.

  10. #10
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    Quote Originally Posted by GMPX View Post
    Randy, I don't remember on the LS1 PCM but is there another PID related to MAP? Something like GM.MAP and not an SAE PID? (Edit, Joe just posted some MAP alternative PID's to try)
    We did have to make some changes to the SAE.MAP PID recently as the set up of that PID was changed by GM. It shouldn't have affected anything but there might be something funny going on.
    I'm going to delete the EFI Live from the new computer. What Version of the software should I download to get in before you made the change to the SAE.MAP Pid? If it works with the older version then we will have our answer.

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