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Prado 90 OBDI vs OBDII TDCL vs MOBD

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  • Prado 90 OBDI vs OBDII TDCL vs MOBD

    I hope this help:

    OBDII Wifi + Bluetooth (Torque, Android, Apple, etc) won't work with 1996 - 2000 Australian Prados.


    1990 - 1996 Toyota (like the other manufactures) came up with their own ECM digital data stream called TDCL (Toyota Diagnostic Comm Link).
    This transmits a few basic engine parameters at a snail's pace (taking 1 sec!).

    1996 USA forced Toyota to be OBDII compliant. Toyota did, but only for USA models. The rest of the world Toyota continued with it's TDCL snails pace serial data protocol.
    OBDI (TDCL) = 100baud = 1.25secs data refresh
    OBDII = 10,400baud = 0.2secs data refresh

    2006 Australia force Toyota to be OBDII compliant

    M-OBD
    BE WARNED! Toyota, if not forced into OBDII by the country will have used TDCL1 ... or for modern cars ... M-OBD.
    WORSE ... Toyota wire up their MOBD to a OBDII socket. So it looks very hopeful to a the normal owner.
    M-OBD = Multiplex OBD.
    M-OBD can only be read by Toyota's Techstream or a handful of scantools.
    Techstream can be DIY'd by $30 ebay/amazon "J2534" usb adapter
    The giveaway is a metallic connector on Pin 7 of the "OBDII" socket, or the mention of "ISO 9141-2 protocol"



    So an American 1996 4Runner / Tacoma / T100 / Colarado with a 5VZ-FE engine is OBDII.
    It has a OBDII port (TDCL3) in the driver's footwell area, and the ECM Pin19 = "SDL"

    So an Australian 1996 Prado with a 5VZ-FE engine is not OBDII.
    It has a OBDI (TDCL1) "Diagnostic" port in it's engine bay and requires counting the CEL.
    The ECM Pin19 = "VF1" serial data stream if TE2 is shorted = SNAIL's PACE LIMITED DATA

    5VZ - Australia (OBDI) Pin19=VF
    Click image for larger version

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    5VZ - USA (OBDII) Pin19 = SDL
    Click image for larger version

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    To Manually read OBDI (TDCL1) Fault Codes see this excellent post:
    --How to read ECU fault codes. 1KZ-TE & D4D
    http://www.pradopoint.com/showthread...l=1#post202402


    It is possible to digitally read
    - OBDI (TDCL1) fault codes.
    - OBDI (TDCL1) Serial Data.

    You can
    - buy a v expensive 3rd party scantool (OBDI compliant)
    for $360aud DTDauto's ScanTool http://dtdauto.com/Product/Product_d...I%20Scan_E.htm
    like this PradoPoint member did: http://www.pradopoint.com/showthread...or-1998-5VZ-FE

    - use Toyota's Techstream
    a) get a "22pin to 16pin" adapter ($15 ebay/amazon)
    b) connect that to a "J2534" or "Techstream USB" adapter ($30 ebay/amazon)
    c) connect into a computer or grounded laptop running Toyota's Techstream


    - DIY your own OBDI cable + use free software
    for $8 see here: http://www.mr2oc.com/showthread.php?t=520850
    info see here: http://toyota.kgbconsulting.ca/wiki/...rial_Interface



    As you can tell ... I have a 1996 Prado 5VZ-FE. I recently changed the head gaskets and now wish to accurately monitor Coolant Temp (+ other parameters).
    I may
    - ebay USB techstream cables
    - DIY the $8 OBDI USB reader
    - DIY custom OBDI reader using Arduino and transmit via bluetooth to an arduino in the cabin with a LCD to output.
    - DIY custom ECM wire splice reader in the cabin read via an ardunio and display on an LCD.

    But I now know I can't just hook up to ECM Pin 19 and get a nice OBDII stream = (

    Hope this helps

    GREAT INFO:
    --- Toyota OBDI vs OBDII http://www.lovehorsepower.com/ToyotaPDFs/h47.pdf
    --- Toyota MOBD https://www.scantool.net/forum/index...sg9267#msg9267
    Last edited by williamturner1; 25-06-2015, 04:10 PM.

  • #2
    Hmm... more info more me to read. Thanks for the links mate!

    Edit: I've already been down the path of the first link with no success. The software was able to see the data but not actually do anything with it. If you have any success, please let me know as I actually still have it fitted in my car.

    Comment


    • #3
      Although... my laptop was never grounded. Just sitting on my passenger running from battery. It would make sense that it needs to be grounded due to the inherent electrical "noise" within the car. Any idea how to ground it?

      Comment


      • #4
        The only way I could think of properly "grounding" a lap top would be to put it into a Faraday Cage type bag. Not the most convenient. What was the problem ?
        Baders-1996 Prado 90 Series 3.4L/TRD Supercharger/2.2" Pulley/Xede ECU/Aquamist Water Meth Injection/Pacemaker Extractors/2.5" Custom Exhaust/West Coast Suspensions HD 50mm lift/Detroit Tru Trac rear diff.

        Comment


        • #5
          Great Post, williamturner1. Exactly what I was looking for!

          I was hoping to find an OBDI Bluetooth adapter and connect to my Android head unit, but have been coming up empty handed. Looks like I'll be going the adapter route and grabbing a 16pin bluetooth transmitter, as well.

          If anyone has made any progress here I'd love to hear how it went!

          Comment


          • #6
            Originally posted by baders View Post
            The only way I could think of properly "grounding" a lap top would be to put it into a Faraday Cage type bag. Not the most convenient. What was the problem ?
            Not sure what the issue was really. I could see data coming in but the software just wasn't responding to it. Would've thought the Faraday cage wouldve isolated it instead of ground it... but either way you're right.. not an ideal situation. Lol

            I also found that nowhere did it list the 5vz-fe as being compatible.
            Originally posted by pcambell1732 View Post
            Great Post, williamturner1. Exactly what I was looking for!

            I was hoping to find an OBDI Bluetooth adapter and connect to my Android head unit, but have been coming up empty handed. Looks like I'll be going the adapter route and grabbing a 16pin bluetooth transmitter, as well.

            If anyone has made any progress here I'd love to hear how it went!
            As mentioned earlier... the only progress I made was I could get data coming in but the software did nothing with it.

            I still have everything in the car so am happy to try again if someone is happy to throw some ideas out there...

            Comment


            • #7
              So, If anyones still interested, I can confim this method works using a laptop plugged into mains with an earth on the powerpack.
              Of course this only gives data from idle &rev in neutral, going to try plugged into an inverter next so data can hopefully be obtained whilst driving.

              now if only someone could shed some light on my maf,
              have a may 99 model with a hotwire maf but with an earlier ecu, the gregories manual has info for a mech maf with the earlier ecu or a hotwire with later ecu but not my combo so I'm not to sure as to whether the 1 to 1.5v is still valid? mine registers at 1.9 -2v

              Comment


              • #8
                So new update, connected my cable to my surface pro 3 via the same usb to serial converter and it works!!! No earth just the SP3 running off its internal battery.

                So jimmied up a quick usb extension through the firewall and went for a drive, all data was recorded which is great. will take it for a run on the H/W later today to get some more data.

                Wonder if there is a way to get this data to import live to torque
                Last edited by Toopy; 09-08-2015, 02:15 PM.

                Comment


                • #9
                  Originally posted by Toopy View Post
                  So new update, connected my cable to my surface pro 3 via the same usb to serial converter and it works!!! No earth just the SP3 running off its internal battery.

                  So jimmied up a quick usb extension through the firewall and went for a drive, all data was recorded which is great. will take it for a run on the H/W later today to get some more data.

                  Wonder if there is a way to get this data to import live to torque
                  Hmm... I wonder. Looks like I might be trying this again lol.

                  Comment

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