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Thread: OBD-II can you use it to...

  1. #21
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    Quote Originally Posted by DavidL
    Roger, in most vehicles the odometer is kept in several modules. You can reset the odo held in the ecu with a factory scan tool in many vehicles, but that won't reset the odo that you see on the dash.

    The "fishhook" manuever is the one that NHTSA uses to rate rollover. Just going 50 in a corner is not simulating the worse case. The fishhook gets the momentum of the vehicle transitioning from one direction to go way over in the other.
    Not only that, the DMV also year to year takes record of the odo when its is registered. So they will find out if it was.

  2. #22
    FLAC muldrick's Avatar
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    I could be wrong...but I believe that most newer cars have rev limiters, not speed governers. Lexus (I work on 'em) uses rev a limiter.
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  3. #23
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    Quote Originally Posted by Heezzi
    Not only that, the DMV also year to year takes record of the odo when its is registered. So they will find out if it was.
    How do they do this? I dont have to go back to the DMV for 8 years...

  4. #24
    Maximum Bitrate EBFoxbat's Avatar
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    Quote Originally Posted by muldrick
    I could be wrong...but I believe that most newer cars have rev limiters, not speed governers. Lexus (I work on 'em) uses rev a limiter.
    It's usually only a RPM limiter in the highest gear. The gov is an onchip-chunk of code. You can replace the chip or reprogram it. A bit pricey.

    Some OBD-IIs can send other codes, it depends on the car. I think the minimum of the OBD-II standard is to reset the engine light. Most new cars can be reset without any control. I know my mother's 04 Toyota Highlander can be reset by using the ignition and trip-odometer reset button in the right order.
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  5. #25
    Constant Bitrate Ill1's Avatar
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    My STi has a rev limiter at ~7K. It cuts the fuel as to not blow the engine.
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  6. #26
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    EBFoxbat,
    I would say "most" vehicles you cannot reset the MIL light with a combination of buttons and that you do need a scan tool to do the reset. There isn't much good reason to reset the light if you haven't pulled the vehicle data first, which also requires a scan tool (for great majority of issues and for the purposes of what the MIL light is mandated to begin with).

    What do you mean that "some OBDIIs can send other codes"? OBD2 is a US federal regulation that Requires vehicles to do certain event reporting and functions to aid in diagnostics. It isn't "some vehicles".

    And the "minimum" is not a reset of the light. The regulation is very specific on what it entails and there is no such minimum requirement.

    BTW, where are you getting your information for "usually only a RPM limiter in the highest gear" from?

  7. #27
    Constant Bitrate jpelzer's Avatar
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    Quote Originally Posted by DavidL
    EBFoxbat,
    What do you mean that "some OBDIIs can send other codes"? OBD2 is a US federal regulation that Requires vehicles to do certain event reporting and functions to aid in diagnostics. It isn't "some vehicles".
    I think he means that some cars send extra data over the OBDII interface that is manufacturer-specific. You're correct that the mandated data is there for every car, in the expected format. But each manufacturer can make other data available over the same bus using their own format. There are also manufacturer-specific error codes.

  8. #28
    I'm sorry, and you are....? frodobaggins's Avatar
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    I don't know about my 98 ranger, but I had a 96 once.
    I couldn't get past 95 in 5th gear. I dropped to fourth and hit 115 !
    (No governor/limiter in 4th apparently )

    (It was still accelerating too, but I got scared as it started to "float")
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  9. #29
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    frodo, sounds like your speed limiter was horsepower / torque curve vs. aerodynamics and not ECU induced

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