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Thread: Uber-easy DIY USB ALDL Cable

  1. #226
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    Thank you. I have the box on order. Looks like it will take a couple weeks to arrive.

    Steve

    Quote Originally Posted by RobertISaar View Post
    connecting them is no problem for the ECM. it takes 3 seconds with a soldering iron, so i would recommend it.

  2. #227
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    Ignore this. I selected to log data and it connected right up even though the test failed. I saw good looking data. Now to do some logging.

    ---

    I am stuck. I cannot get Tuner Pro to find the cable. It is searching at 8192baud. That isn't even an option on the port settings. Tuner Pro only sees COM2 so that is what I set the device to. Currently the port is set to 9600 baud. The device has RXD and TXD ports that were jumpered when it arrived. I assume the RXD port is what I want? I used the 2.8.14 drivers specified on page 15. No change.

    Suggestions?
    Last edited by srgould41; 06-07-2014 at 06:18 AM.

  3. #228
    Fuel Injected! shimniok's Avatar
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    Remember me from 2 years ago? :D I'm back to messing with DIY ALDL setup on my 7747, wanted to share updates. Hope it's not old news. Using Sparkfun FTDI Basic Breakout 5V with an emitter-follower transistor as a signal buffer. For whatever reason I could not get a data stream when it was running unless I had the buffer. So far so good, except some data errors after waking the laptop and starting the Jeep. I'll dig into that and do more testing this week as I fine tune the Jeep for emissions using my own Ostrich 2.0 and Burn2 (was using AutoProm in 2012).

    When I'm convinced I have it working reliably I'll design a small board for myself with FTDI chip, USB connector, transistor(s), filtering caps, whatever else. I could make extras if anyone is interested. I don't have anything to test the 8192 stuff on, but could try to build it to accommodate that too.
    1986 Jeep Grand Wagoneer - stock AMC 360 V8, 3" exhaust - 1227747 ECM - $42 ASDU - tc.wagoneer.org - www.bot-thoughts.com

  4. #229
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    is thier a cheap simple ft232rl that i can use with my 1227747 ecu that ships from the us instead of from china with their crazy shipping times?

  5. #230
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    i believe you can set ebay to remove all results outside of a chosen area. beyond that, not much else, almost everything is china based.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  6. #231
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  7. #232
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    Just a quick update. I have not yet resolved the problems with the Sparkfun FT232RL but I'm still working on it. I'll let you know what I come up with.

    What happens is that the USB adapter appears to stop receiving data. I'm not sure if this is a problem with the FT232RL or the host computer or what, exactly. I do know that the RX light on the device stops blinking, but that can be caused by a variety of things. I'll have to take an oscilloscope along next time and investigate after the problem occurs, I guess.

    Unplugging the device from USB and reinserting it, disconnecting and reconnecting does seem to work most of the time. I've updated the drivers to the 2/2014 version to no avail.

    I somewhat suspect a ground problem or some electrical noise/interference/overvoltage or something along those lines. The adapter is getting power from the USB device. The signal is coming in from the ECM. The USB adapter is grounded to the ECM box. I should probably explore how that's grounded.
    1986 Jeep Grand Wagoneer - stock AMC 360 V8, 3" exhaust - 1227747 ECM - $42 ASDU - tc.wagoneer.org - www.bot-thoughts.com

  8. #233
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    Quote Originally Posted by joegreen View Post
    looks fine.

    Quote Originally Posted by shimniok View Post
    Just a quick update. I have not yet resolved the problems with the Sparkfun FT232RL but I'm still working on it. I'll let you know what I come up with.

    What happens is that the USB adapter appears to stop receiving data. I'm not sure if this is a problem with the FT232RL or the host computer or what, exactly. I do know that the RX light on the device stops blinking, but that can be caused by a variety of things. I'll have to take an oscilloscope along next time and investigate after the problem occurs, I guess.

    Unplugging the device from USB and reinserting it, disconnecting and reconnecting does seem to work most of the time. I've updated the drivers to the 2/2014 version to no avail.

    I somewhat suspect a ground problem or some electrical noise/interference/overvoltage or something along those lines. The adapter is getting power from the USB device. The signal is coming in from the ECM. The USB adapter is grounded to the ECM box. I should probably explore how that's grounded.
    no other laptop to test with to rule that out? the ECM side of datalogging is pretty solid on a 7747, so i would assume adapter or laptop.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  9. #234
    LT1 specialist steveo's Avatar
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    i just chopped out my aldl port and replaced with one of these

    I love it. . even has blinky lights! I love blinky lights

    thanks for the tip Robert

  10. #235
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    i'm considering doing the same for all of my cars..... cost ~$4(and any enclosure you might use) and just hide the USB cable somewhere, save the ALDL cable some wear and tear for the vehicles that don't have a cable integrated into it.

    i've only come across 1 application that has issues so far: 88-93 grand prixs with a DIC. the drive circuit in them seems to be just weak enough to where even just having the cable hooked up will cause it to quit receiving ALDL data. have to either unplug the cable or have a toggle switch open the circuit for when you don't need to datalog. i've seen this with 3 different cars and don't know what to think of it. other DIC/DIS systems of the era don't seem to have an issue with a cable just being present.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  11. #236
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    ok so i received my ft232rl today and soldered up one wire to the tx and rx and another wire to the ground. i cannot get the cable to work with winaldl or tunerpro rt. i tried doing cable tests and they all failed. I believe this is what it should look like. the tx and rx lights light up when i first put it into the computer. i looked around online and made sure the com port was correct and that is was set to 4800 baud which i read was 160 baud. Dont mind my somewhat archaic solder job. I had some crappy solder because i could not find my spool of the good stuff.
    Attached Images Attached Images

  12. #237
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    does your ECM require the 10K to get data started? the Rx light should be flashing a lot if the ECM were pushing out data.

    EDIT: there is also the possible issue of an incompatible driver which almost always is alleviated by using older drivers.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  13. #238
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    My bench 7747 running ASDU connects right up without the 10K in place.

    If your cable fails TunerPro RT's self test (test with the cable plugged into the laptop but not plugged into the vehicle) you are not going to connect to the ECM.

    +1 on try rolling back the drivers and see if that clears up your problem.
    Last edited by phonedawgz; 07-08-2014 at 12:48 AM.

  14. #239
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    did u ground it and install the driver

  15. #240
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    Quote Originally Posted by phonedawgz View Post
    +1 on try rolling back the drivers and see if that clears up your problem.
    Here's the link to installation of cable to TunerPro RT plus the update and links to problems found with new drivers. Read carefully!

    http://www.gearhead-efi.com/Fuel-Inj...to-TunerPro-RT

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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