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Thread: Tuning through OBD?

  1. #1
    GTA
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    Tuning through OBD?

    Can cars be tuned through OBD?

    Thanks.
    Everybody has their own agenda.

  2. #2
    Newbie Kalavera's Avatar
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    No, I'm afraid not. OBD reads information only, hence the 'Diagnostics'. Thought about that myself.

    Quote Originally Posted by GTA
    Can cars be tuned through OBD?

    Thanks.
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  3. #3
    Low Bitrate SonicCobra03's Avatar
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    Quote Originally Posted by Kalavera
    No, I'm afraid not. OBD reads information only, hence the 'Diagnostics'. Thought about that myself.
    Incorrect. You can flash a cars computer through an ODB2 port. I have a 2003 cobra and there are two hand held tuners that plug in through the ODB2 port. When I had my car tuned it was flashed, so there's no sign of a chip. Check out SuperChips and Diablo has one out called the Predator.

    If your talking about ODB1, then sorry, can't help you out there.

  4. #4
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    Not every car supports this.

  5. #5
    Constant Bitrate
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    Most cars (and trucks) do support flash via the diagnostic connector. There is a relatively new standard SAE protocol to do this as well.

    Most OBD2 vehicles also support 2 way interfaces. From a "scan tool" you can turn on / off some devices and program in customer features like rolling locks / tilting side mirrors in reverse / etc.

    BTW, when a dealership says their scan tool costs "thousands" vs. "hundreds" for consumer tools, it is not apples to apples comparison. Professional tools have lots more features and data support and hardware that meets OSHA and other standards - like Flash capability.

    We wary of flashing with cheap scan tools (that probably will begin to show up in the next year or so) On many vehicles - if the flash is not done correctly or is stopped midstream - the controller (ECU) is throw away material as they don't have a boot sector resident.

  6. #6
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    What is the name/id of the new SAE protocol?
    When was it completed?
    Is it mandatory for manufacturer's to implement it?

  7. #7
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    J2534 is the standard. It's been a while. It is mandatory.

  8. #8
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    J2534 is standard as of 2004, it doesn't allow any non-OEM programming.J2534 allows the use of a "pass through" device(as SAE calls it), which is basically a translator(cheapest I have seen is $1700) that connects to the OBDII port and a windows 98+ computer.You can only reprogram factory approved software(downloadable from the OEMs through subscription services).All the software(upgrades and existing) are fully encrypted.

    All OBDII ecus should be re-flashable(it is a requirement of OBDII compliance), but any 2-way communication with the ecu(other than basic diagnostic stuff) requires a factory security "code"(usually an expensive subscription).I also believe(not entirely sure) that the boot blocks are write protected, so no need to worry about trashing the ECU.

  9. #9
    Constant Bitrate
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    Eclipsed,
    J2534 hardware is just coming out now and will get cheaper.
    Yes, it is today only for OEM software that has gone through emissions certification.
    Yes, it is encrypted.
    For most vehicles, no "code" for 2 way, just lots of hard work to translate, program and validate OEM protocols. The "code" is the OEM specific methodology for dialouging with the particular ECU. There are also on some vehicles intentional >12 volt step up to get into programming mode to avoid unintentional flash mode. And other safety related design issues.
    Boot blocks are ECU specific. Many have no protection. Lots of ECUs are fried due to this issue. More recent ECUs do have boot sector and are safer to experiment with. So there is an issue of trashing MOST ECUs.

  10. #10
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    hi all
    i wonder if there is simulators or emulators to examine my new programe before i break my car down

    plzz if any one know tell me ASAP

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