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Thread: PCM Conversion Information

  1. #1
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    Default PCM Conversion Information

    I have noticed that for most conversions posted on this forum, it is simply a matter of how to make an existing system stand alone. Or how to make an ECM talk to the TCM. I would like to put together a basic list of what it takes to make a PCM (or ECM) work on what ever engine you are trying to get to run.

    The reason behind such a list (or if one already exists ????) is to help the DIY guy understand the basic things that are needed. Like - for a 0411 swap, you need to have a 24X crank timing sensor and a 1X cam sensor. I know that EFI Connections has a wealth of information and parts to assist as well, but just a basic list might help inspire others to try and make something work.

    Example of info that might be helpful to document for DIY conversion:
    PCM type - LS1, E40, etc...
    Crank signal - 24X, 58X, etc...
    Cam signal - 1X, 4X, etc...
    Anything quirky or special about the system - Supports DOD, ????
    Other items that would prevent you from making it run - ????

    Maybe a side part of this could be which autos are also supported (for PCM OS's)

  2. #2
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    Here's an initial hack of the type of information that I thought might be useful.

    Please send me any additions or corrections and I will update. I realized that this is only a small part of a conversion, but it might help to get people started.




    UPDATED - 13 Jan 2014: Updated showing the latest file with updated information in it (saves having to scroll to the end of the post )
    Attached Files Attached Files
    Last edited by turbo_bu; January 13th, 2014 at 05:18 AM.

  3. #3
    Lifetime Member ChipsByAl's Avatar
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    I would separate the LS1a and LS1b PCM's. The 97-98 LS1a PCM does not have any COS available from EFI_Live. I don't have the list but there are several other part numbers available for the above PCM's.
    Al
    "Trash that carb and get Injected!"

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    Thanks for the reply. I will seperate the LS1A's and put a note about the COS's and converting to a LS1B. That appears to be what almost everyone does anyway.

    Anyone happen to have the details on the crank / cam pickup info?

  5. #5
    Joe (Moderator) joecar's Avatar
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    So all the 24x CKP had 1x CMP, and all the 58x CKP had 4x CMP, no crossovers, right...?

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    Hello turbo_bu,

    I took a quick look at the attached PDF file – the beginnings of a nice chart !

    A couple of things ….

    There is a note in your chart that states: “Most any OS can be flashed to a standard 0411 PCM”. While the 12200411 PCM is often considered a “universal donor” of sorts, it has a 512 Kb memory – compatible with most 1999 to 2002 OEM tunes. The only exception I can think of is the OEM 2003 Corvette tune – which was essentially a carry over from 2002 – and is under 512 Kb.

    Also, the 2001 & 2002 Savana / Express vans used an LS1-B style PCM (not a black box Vortec style PCM) with the 5.0L and 5.7L Vortec (Gen I based) engines. Many of these were the 12200411 PCM - which is very helpful in retrofitting the “0411” PCM into older applications.

    Regarding your request for quirks / anything special about various systems …

    The 1996 model year was the first for the black box Vortec PCM …. in V6 S10 applications the ABS control system was in the PCM – in the 1997 and later S10s, the ABS control system was a standalone unit.

    I’m not sure if this is also true for the V8 platforms in these years - most of my experience with 1996 to 2000 Vortec engines / PCMs is their removal to make way for a Gen III installation.


    Regards,
    Taz

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    I was typing when you posted Joecar …..

    All Gen III V8s are 24x CKP and 1x CMP. All Gen IV V8s are 58x CKP and 4x CMP.

    Early LS2 engines (2005 Corvette, and 2005 & 2006 GTO) are actually Gen III’s – believe the CMP sensor was moved to the front timing cover. I believe these used the E40 PCM ….


    Regards,
    Taz

  8. #8
    Joe (Moderator) joecar's Avatar
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    So, the early LS2/E40 (2005 Corvette, 2005-6 GTO) had 24x CKP and 1x CMP (with the CMP on the sprocket)...?

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    Yes .... Gen III CMP mounted at the back of block (took signal from a reluctor on the camshaft itself) ... early LS2 moved CMP sensor to the front of the block in the front cover (like later Gen IV) and took signal from the cam sprocket.

    The existence of 1x and 4x cam sprockets makes running a Gen IV engine with a Gen III PCM a little bit easier ... still have to change the crank reluctor (or the entire crankshaft / reluctor as a unit) .... and adjust the the knock sensor tables to work with the LS2 "flat response" type knock sensors ...

    The early LS2's (2005 Corvette, etc.) have a 24x CKP and a 1x CMP in place - making the swap to a Gen III PCM a little easier.

    Regards,
    Taz

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    Yes, 05-06 LS2s used the E40 ECM which is a 24x crank reluctor (and Im going to assume a 1x cam sensor like you're both saying). Except the 06 Vette, it used the E38 with 58x and 4x, everything else switched to the E38 or E67 for 07. The E40 was a temp stopgap to run LS2s, GM should have just gone to the E38/E67 but something must have prevented them from doing so.
    ~Erik~
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