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  • 1996 UART?

    does anyone know the BAUD RATE (I think that is the proper term) for the 1996 OBD2 PCM that was used in a 1996 Grand Prix?

    This is for the UART, not the class 2.

    Thanks
    Last edited by 3100 MPFI; 01-30-2008, 09:02 PM.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  • #2
    I have been reading, and I might not be asking the right question.

    I need to know the format that the UART signal for the data line from the PCM to the ALDL works in the 1996 Grand Prix 3100 SFI PCM.

    I am trying to hook up something to it, and it says that the older ECM will an 8192 BAUD will work, but that the 1996 is not compatible. I want to know WHY.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"

    Comment


    • #3
      OBD2 is not the same thing as ALDL. ALDL was mid-1995 and earlier. OBD2 is its own set of protocols. Most GM and most Chrysler use the SAE J1850 VPW protocol. You can buy the protocol document from SAE, or you can get a kit from http://www.obddiag.net/multiadapter.html to connect via USB to your computer.

      Comment


      • #4
        That is not quite what I mean.

        1989-1993 has a certain data stream that certain things can read. It is called CLASS 1 DATA.

        1994-1995 only has a CLASS 2 data.

        1996 has both CLASS 1 AND CLASS 2.

        What I am trying to hook up is a digital gauges cluster in my 1988 Cutlass Supreme that has a 1996 OBD2 PCM.

        If I connect the digital gauges cluster data wire to the OBD2 CLASS 1 data stream, will the tach work?
        Taylor
        1988 Olds Cutlass Supreme 3100 MPFI
        1990 Pontiac Grand Prix STE 3.1 MPFI
        1994 Olds Cutlass Supreme convertible
        1998 Lincoln Mark VIII
        "find something simple and complicate it"

        Comment


        • #5
          Hmmm. Not sure if that will work... Cause I know people with the digital dashes the ECM code is made differently. I remember someone had a thread about their digital gauges not working in their beretta after a chip from Ben, and Ben said he would need to use the older ECM code for that to work as the newer didn't put out the right stuff in the ALDL stream.

          Even if you can get that info, it would be different address,etc in OBD2 surely if just different OBD1 code can make or break the digital dash from working.

          Might not be possible.
          Last edited by IsaacHayes; 04-16-2008, 11:57 PM.
          sigpic New 2010 project (click image)
          1994 3100 BERETTA. 200,000+ miles
          16.0 1/4 mile when stock. Now ???
          Original L82 Longblock
          with LA1, LX9, LX5 parts
          Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

          Comment


          • #6
            That is why I am trying to get the baud rate. If the 1996 class 1 (which is not used in the 1994 and 1995 obd 1.5) has the same rate, then in theory it will work.

            I know that the digital clusters don't work in the 1994 and 1995, but since they don't have the class 1 for that year, then it seems that if the baud rate is the same for the 1996 class 1 (which is listed as UART, same as the 1989-1993), then it will work as long as the data wire is hooked up to the class 1 wire.

            I still get the feeling that this is one of those things that I will never find out unless I do it myself.
            Taylor
            1988 Olds Cutlass Supreme 3100 MPFI
            1990 Pontiac Grand Prix STE 3.1 MPFI
            1994 Olds Cutlass Supreme convertible
            1998 Lincoln Mark VIII
            "find something simple and complicate it"

            Comment


            • #7
              You're missing another part of it. Even if the baud is the same, there is different hexidecimal addresses that the data is located in the stream. I'm not talking about 94-95 cars at all. That thread I was referring to was still the old eeprom cars. Just different computer code masks of the same car but different year will have different sensor values reporting. You can see this with a definition file in tunerpro, load the wrong one even if it's still the same engine and you might have RPM's reporting what the MAP sensor is /etc.

              So you'd have to get incredibly lucky that the addresses that the gauges need to see are the same for 96 as in 88. Highly unlikely since they changed between years let alone different engines...

              Too bad the digital gauges didn't run off analog inputs like the analog ones did. LOL. They had to be "fancy" and decode the ALDL stream hehe. I guess that was easier to have the ECM interpret the signals and just pull the data from it though than make another module to convert the signals.


              So what's stopping you from hooking up the thing? I don't think it would fry anything if the baud rate was off. Might just get some weird readings or nothing at all. As long as the voltage/etc is the same and wires connected right.
              sigpic New 2010 project (click image)
              1994 3100 BERETTA. 200,000+ miles
              16.0 1/4 mile when stock. Now ???
              Original L82 Longblock
              with LA1, LX9, LX5 parts
              Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

              Comment


              • #8
                nothing stopping me. In fact, it IS hooked up, but I can't test it yet. I have to do a few more things to the wiring and engine before it will be ready to attempt to start it.

                I am just trying to get some information on this before I turn the key.

                I have a feeling that there is other things that I will need to find out, but I feel like such a fish out of water. To the best of my knowledge, NO ONE has done an OBD2 conversion to a 1988-1993 w-body.

                Worst case senario I will have to put the analog gauges cluster back in. No big deal on that one. I was just trying to figure this out now so that maybe I can also get my DIC working as well. I know the DIC does not work in the CLASS 2 cars, but I am hoping that the 1996 class1 will allow for some of it to work. I know the fuel will work, but the tach and engine data probably will not. I am just trying to find a way to get it so it will work.
                Taylor
                1988 Olds Cutlass Supreme 3100 MPFI
                1990 Pontiac Grand Prix STE 3.1 MPFI
                1994 Olds Cutlass Supreme convertible
                1998 Lincoln Mark VIII
                "find something simple and complicate it"

                Comment


                • #9
                  Having a working DIC is important. LOL sorry I'm in a nutty mood. It will probably fail if the gauges fail. I doubt it will all work but maybe you are lucky?
                  sigpic New 2010 project (click image)
                  1994 3100 BERETTA. 200,000+ miles
                  16.0 1/4 mile when stock. Now ???
                  Original L82 Longblock
                  with LA1, LX9, LX5 parts
                  Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

                  Comment


                  • #10
                    not lucky yet, but I hope to get lucky REAL SOON.

                    I think I am in just as nutty of a mood as you are.
                    Taylor
                    1988 Olds Cutlass Supreme 3100 MPFI
                    1990 Pontiac Grand Prix STE 3.1 MPFI
                    1994 Olds Cutlass Supreme convertible
                    1998 Lincoln Mark VIII
                    "find something simple and complicate it"

                    Comment

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