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Thread: Source of data on GM.GEAR PID

  1. #1
    Junior Member SirNemesis's Avatar
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    Default Source of data on GM.GEAR PID

    Hi guys,

    I'm in the process of troubleshooting a shifting problem with my project car and knowing the source of data for the GM.GEAR PID will greatly assist with the troubleshooting process.

    Summary:

    Gen3 6.0 Volvo 240. Running cable throttle and flex sensor
    4L80e, rebuilt by me
    Whole car rewired by me
    P59 PCM running 03150003 OS with 4L80e segment swap

    I have mentioned 'by me' so people can safely assume I don't know what I'm doing and can also identify things I've likely screwed up.

    The problem I'm having is with 2nd gear. It doesn't seem to exist for automatic upshift or automatic downshift, yet everything else in the transmission works nicely (including manual 2nd). I'm logging GM.GEAR and can see in the logs it shows 2, but it doesn't 'feel' like its getting 2.

    If I can confirm where this information is source (e.g. requested gear from PCM, OR feedback from transmission pillow switches to indicate shift selection), I can potentially rule out a bunch of areas I've played with (or not).
    1985 Volvo 240 || LS2 || 4L80e || S488 Turbo

  2. #2
    Joe (Moderator) joecar's Avatar
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    You should see engine rpm and vehicle speed correspond correctly...

    Post tune and logs.

  3. #3
    Junior Member SirNemesis's Avatar
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    Quote Originally Posted by joecar View Post
    You should see engine rpm and vehicle speed correspond correctly...

    Post tune and logs.
    If only it was that easy to tell...

    - I've never driven a car with a stall
    - I've never driven a car with a 4L80e (different gear ratios to a 4L60e)
    - Engine is loud

    I believe I've found the source of the problem, but for the purpose of closing out this question lets keep the discussion going. While I was unclear/unsure of it before, it is pretty safe to say that I do NOT have 2nd gear in the log attached.

    Log file and tune attached.

    Log_0001.efi
    AZ_COS3_V60_FX_4L80E_12579405-V2P12.ctz
    1985 Volvo 240 || LS2 || 4L80e || S488 Turbo

  4. #4
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    There is a parameter to set the current gear based on the pressure control solenoid inside the trans. Set the PRNDL to none IIRC.
    "All that is needed for the triumph of evil is that good men do nothing..."

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