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Thread: running an LM on the bench for electronics projects

  1. #1
    boostaholic
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    running an LM on the bench for electronics projects

    I've got a spare LM that I'd like to be able to power up on the bench to see if I'm smart enough to get it talking to an arduino. I figure I have to build a power supply to give it 12 volts on J11 and K14 and 8 volts on N6. What else do I have to feed it to convince it that the engine is running, or at the very least to get it to spit some data out down the serial lines to I can start fiddling? What does the LM expect the input on the Ignition Reference and Fuel Injector Sync lines to be? 0-5v squares?

    I'd like to eventually build myself a datalogger that reads certain serial bytes and maybe even an external sensor and saves the strings to a microSD card for later review in a CSV format or something so it's easy to import in to MPTune.

  2. #2
    Visit www.boostbutton.com... Turbo Mopar Contributor ShelGame's Avatar
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    Re: running an LM on the bench for electronics projects

    Subscribed. I need to do this, too...
    https://db.tt/SV7ONZpQ
    Rob Lloyd
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  3. #3
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    Re: running an LM on the bench for electronics projects

    Quote Originally Posted by iangoround View Post
    I've got a spare LM that I'd like to be able to power up on the bench to see if I'm smart enough to get it talking to an arduino. I figure I have to build a power supply to give it 12 volts on J11 and K14 and 8 volts on N6. What else do I have to feed it to convince it that the engine is running, or at the very least to get it to spit some data out down the serial lines to I can start fiddling? What does the LM expect the input on the Ignition Reference and Fuel Injector Sync lines to be? 0-5v squares?

    I'd like to eventually build myself a datalogger that reads certain serial bytes and maybe even an external sensor and saves the strings to a microSD card for later review in a CSV format or something so it's easy to import in to MPTune.
    I did exactly this with an SBEC. It should be the same with the LM I would think, although the baud rate and exact pin numbers will probably be different. The diagnostic serial stream goes active regardless of whether the ECU gets valid data from sensors. Otherwise it wouldn't be much of a diagnostic function.

    http://www.turbo-mopar.com/forums/sh...=1#post1065726

  4. #4
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    Re: running an LM on the bench for electronics projects

    Cool. I'll see if I can get one powered up tonight and then work on making it talk and building a stim board for it.

  5. #5
    Supporting Member Turbo Mopar Contributor mopar-tech's Avatar
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    Re: running an LM on the bench for electronics projects

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    Working on clearing the decks.

  6. #6
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    Re: running an LM on the bench for electronics projects

    Yeah, I don't think I have any spare power modules hanging out though.

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    Visit www.boostbutton.com... Turbo Mopar Contributor ShelGame's Avatar
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    Re: running an LM on the bench for electronics projects

    Quote Originally Posted by iangoround View Post
    Yeah, I don't think I have any spare power modules hanging out though.
    I've got like 5. Want one?
    https://db.tt/SV7ONZpQ
    Rob Lloyd
    '89 Daytona C/S

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  8. #8
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    Re: running an LM on the bench for electronics projects

    I'm going to check my garage for one, but if i dont have one then sure. It's good to have a spare around anyway.

  9. #9
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    Re: running an LM on the bench for electronics projects

    I found a spare PM in my garage and got the LM powered up. The first thing I did was see if I could get it talking to MPScan because I had that working at one point in my car. MPScan seems to throw out the initial handshake but the LM doesn't respond. Not sure if it's because the LM is bad (possibly), I burned an old stock cal on the chip I put in it and it doesn't understand what's going on (maybe), or the FTDI board i'm using as a USB Serial port is no good.

    Unfortunately I'll probably have to put this off for a few weeks because work is about to get insanely busy.

  10. #10
    Supporting Member Turbo Mopar Contributor
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    Re: running an LM on the bench for electronics projects

    did you look at the mpscan logs? they "might" be able to tell you some additional info.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  11. #11
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    Re: running an LM on the bench for electronics projects

    Subscribed for impressing chicks with mad h4xx0ring skills...

    Plug for a local to me guy with arduino stuff and other bits and pieces... http://www.dipmicro.com/ he ships from US side a few times a week also.


    Edit: Everyone knows you can use a PC ATX PSU by shorting power good to ground right? Green wire to black wire usually. Thought so, carry on.
    DD1: '02 T&C Ltd, 3.8 AWD. DD2: '15 Versa Note SV, replacing.. DDx: '14 Versa Note SV << freshly killded :( ....... Projects: '88 Voyager 3.0, Auto with shift kit, timing advance, walker sound FX muffler on 15" pumpers wrapped in 215/65/R15 H rated Nexens.... and a '95 phord escort wagon PnP head << Both may need to go :( ..... I like 3.0s ... so??? ... stop looking at me like I've got two heads!

  12. #12
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    Re: running an LM on the bench for electronics projects

    Quote Originally Posted by wowzer View Post
    did you look at the mpscan logs? they "might" be able to tell you some additional info.

    Where are the log files hidden? I can only seem to find update logs but no error logs.

  13. #13
    Supporting Member Turbo Mopar Contributor
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    Re: running an LM on the bench for electronics projects

    in vista and above the mpscan log files will be in the directory called "C:\Users\"username"\AppData\Roaming\MPScan and the filename is mpscanport.txt. on xp it is in the same directory where the actual mpscan.exe file was installed.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  14. #14
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    Re: running an LM on the bench for electronics projects

    Ah. I didn't think to look there. I'll check when I get home tonight.

    How hard would it be to add a "view log files" option to one of the menus in MPScan?

  15. #15
    Supporting Member Turbo Mopar Contributor
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    Re: running an LM on the bench for electronics projects

    Not hard. Good idea.ø
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  16. #16
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    Re: running an LM on the bench for electronics projects

    Here's what the log says

    mpscan ver - 2.0.2.5Microsoft Windows 7 Professional - Win32NT
    trying to open port COM10 - ctlrecord_click
    got a good port back - ctlrecord_click
    try to open port COM10 -initport
    COM10 is a legit port -initport
    usb is available on COM10 -initport
    usb ftdi serial number LCYKUH4F is available - initport
    setting port baud rate to 976
    ftdi open successful on COM10 -usbportinit
    using protocol LM:0
    attempt to change ecu baud rate to 7812
    Sending byte 18
    Received byte 98
    Sending byte 18
    Received byte 98
    Changing mpscan baud rate to 7812
    Sending byte 18
    Received byte 0
    Sending byte 18
    Received byte 0
    Sending byte 18
    Received byte 0
    Sending byte 18
    Received byte 0
    usbsethibaud failed - usbportinit
    ftdi open unsuccessful - usbportinit
    Sending byte 254
    Received byte 0
    Sending byte 254
    Received byte 0
    can't open ftdi port - usbportinit
    Unable to open/setup port. - ctlrecord_click

  17. #17
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    Re: running an LM on the bench for electronics projects

    So, I accidentally let all the magic smoke out of my spare LM. I shouldn't be allowed near a soldering iron after midnight.


  18. #18
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    Re: running an LM on the bench for electronics projects

    Try again, that was only a 5 cent part
    DD1: '02 T&C Ltd, 3.8 AWD. DD2: '15 Versa Note SV, replacing.. DDx: '14 Versa Note SV << freshly killded :( ....... Projects: '88 Voyager 3.0, Auto with shift kit, timing advance, walker sound FX muffler on 15" pumpers wrapped in 215/65/R15 H rated Nexens.... and a '95 phord escort wagon PnP head << Both may need to go :( ..... I like 3.0s ... so??? ... stop looking at me like I've got two heads!

  19. #19
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    Re: running an LM on the bench for electronics projects

    Haha. You're right. I don't have anything in my stock that value so I'll have to make a run to the electronics store. I have no idea what else it took out at the moment, but it certainly smells like roasted ICs in here.

    Maybe this is when I take the whole board apart and diagram it. I won't have my car back from the paint shop until the snow is gone at the very least anyway.

  20. #20
    Visit www.boostbutton.com... Turbo Mopar Contributor ShelGame's Avatar
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    Re: running an LM on the bench for electronics projects

    If you figure out what it's for, let me know. I have 3 dead SMECs with the same part fried (not by me). I'd like to know what it is and if it can be repaired.
    https://db.tt/SV7ONZpQ
    Rob Lloyd
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