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Thread: OBDII Diagnostic Solution for $64 (+shipping)

  1. #71
    Variable Bitrate ramy_zohair's Avatar
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    2002 magna

    Hey digimotojoel,
    will your ISO elmscan tool work with my 2002 mitsubishi magna. It is an australian built car. I searched everywhere but couldn't find anything helpful. You are the only one who could help. I need it urgently.
    Ramy

  2. #72
    Raw Wave shotgunefx's Avatar
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    Hi Joel,
    Two questions for you.

    1. Did your guys ever figure out the standby power consumper if the unit is left plugged into the OBDII interface?

    2. Why do all OBDII responses seem to start with '4'? Does this ever vary?

    Say I issued an 0101 and the result is 41 01 81 07 65 04. I get the 1 01 is the pid request, but why is the first digit 4?

    Thanks,
    -Lee

  3. #73
    Constant Bitrate joeyoravec's Avatar
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    Quote Originally Posted by shotgunefx
    1. Did your guys ever figure out the standby power consumper if the unit is left plugged into the OBDII interface?

    2. Why do all OBDII responses seem to start with '4'? Does this ever vary?

    Say I issued an 0101 and the result is 41 01 81 07 65 04. I get the 1 01 is the pid request, but why is the first digit 4?
    On #1, no idea. If you're ever in the market again, please check out my company's Mongoose ISO/CAN interface. This is a high-quality device, designed with many of these issues in mind. The J1850 version will come later.

    On #2 apparantly your hardware doesn't return the message header. You sent a mode/sid 0x01, pid 0x01 request. The 0x41 indicates a response to SID request 0x01, as defined in J1979 page 24 (Apr 2002). Notice the pattern; OBD-II responses always contain the SID plus 0x40 to indicate response messages.

  4. #74
    Raw Wave shotgunefx's Avatar
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    Quote Originally Posted by joeyoravec
    On #1, no idea. If you're ever in the market again, please check out my company's Mongoose ISO/CAN interface. This is a high-quality device, designed with many of these issues in mind. The J1850 version will come later.

    On #2 apparantly your hardware doesn't return the message header. You sent a mode/sid 0x01, pid 0x01 request. The 0x41 indicates a response to SID request 0x01, as defined in J1979 page 24 (Apr 2002). Notice the pattern; OBD-II responses always contain the SID plus 0x40 to indicate response messages.
    Thanks. So the 0x40 just indicates the response. I have headers turned off currently, but I didn't see it explained anywhere I searched.

    A question on your interface. I've got an ISO interface (ISO9141 I believe, I know my elm323 works with it).

    What would the sampling rates be like? One thing that would put me off is only having a dll available. Particularly because I'm linux-centric as far as the car goes. I'm working on a dashboard app for my own purposes, so anything I'd get would have to have developer support of some kind under linix.

  5. #75
    Constant Bitrate joeyoravec's Avatar
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    Quote Originally Posted by shotgunefx
    What would the sampling rates be like? One thing that would put me off is only having a dll available. Particularly because I'm linux-centric as far as the car goes. I'm working on a dashboard app for my own purposes, so anything I'd get would have to have developer support of some kind under linix.
    Mongoose uses full-speed USB (12mbps) with no crappy serial converter ICs. There is no problem getting full-bandwidth K-line. The only one I cannot promise yet (still testing) is simultaneous full-bandwidth CAN and K-line. It's still new so we're still running the benchmarks and making improvements. But I can tell you, full-speed USB blows away old serial hardware.

    Linux is no problem -- our more expensive units actally run Linux inside, so it's something we handle every day (except me, I work on OS X). The driver is provided as a .dll, .so, or .dylib depending on the platform. Since almost all customers use Windows, the Linux support is handled seperately on request.

    If you want to program some software, go for it. We provide some sample code that demonstrates OBD-II vehicle messages via PassThru API. I have a couple vehicle controllers available, accessible over the internet. If you are serious about it you can contact me privately and I can get you more information.

  6. #76
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    obdII readings are cool & all.... but are there any solutions available from digimoto that allow reprogramming & modifying fuel maps & such...... would definatly help add a turbo.........

    I know I've seen this somewhere..... just can't remember where.....

  7. #77
    Variable Bitrate ramy_zohair's Avatar
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    OBDII is read only. The only thing you can change is resetting the Service Engine LED.
    If you want to change stuff like fuel maps, turbo boost ... etc, you will have to replace your ECU (engine control unit). I don't think Digimoto offer such ECUs.
    The best I can think of is The AEM EMS:
    http://www.aempower.com/product_ems.asp
    You get control over loads of stuff (more than you can ever imagine).

    Here's a review of it (On an EVO8):
    http://features.evolutionm.net/artic...mfeatures/38/2

    It's a bit pricey though.

  8. #78
    Raw Wave shotgunefx's Avatar
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    Quote Originally Posted by turbocad6
    obdII readings are cool & all.... but are there any solutions available from digimoto that allow reprogramming & modifying fuel maps & such...... would definatly help add a turbo.........

    I know I've seen this somewhere..... just can't remember where.....
    Not through OBDII. Maybe not even through the ECU with the right tools.

    For instance, my car (sebring coupe, same platform as the eclipse, dodge stratus coupe), it's virtually impossible. None of those parameters are adjustable in the ECU. It also "learns", so whatever you add to it, it will compensate to remove the benefit. It's very frustrating.

    You can get a Apexi Super AFC to adjust the air/fuel or a really expensive pass through ECU that modulates the signals so the engine doesn't think anything has changed. A real pain and and less than ideal solution.

    This is the reason that any type of forced induction on these vehicles will run you at least $5000.

    Though now with the availability of vehicle flashes with J2534, I'm aiming to start figuring out the interesting bits of my vehicle rom so I can adjust the flash files and then reflash the vehicle with the new maps.

    I think for most cars though, it's not nearly as hard.

    How long this will take and what measure of success I'll have, who knows.

  9. #79
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    Hi
    Sorry for my bad english.
    you can get more than 200 updates from ELM32xx processor
    im working in my own software and i can get the next refresh
    rates in VPW Protocol:

    Example 2000 Chevy Impala:
    NOTE: The speed may vary depending of all traffic of messages between
    the PCM and others modules

    VPW Generic Mode 10 PID's at 0.474 to 0.583 mS
    VPW Enhanced Mode 10 PID's at 0.822 to 0.912 mS
    PID for Engine RPM Generic Mode:
    Snd..........> 01 0C
    Rcv..........< 41 0C [0B 98] = 742 RPM

    PID for Engine RPM Enhanced Mode:
    Snd..........> 23 FA 5A 00 FF 01
    Rcv..........< 63 FA 5A 00 FF 01 [0A F8] = 702 RPM

    If you see the difference between Generic Mode and Enhanced Mode is
    two times more data in Enhanced Mode

    Now calculating and assuming that refresh rate of 10 PID's is about of
    0.600 mS (Generic Mode) you can get 1000 PID's per minute.

  10. #80
    Raw Wave shotgunefx's Avatar
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    Quote Originally Posted by rovasi
    Hi
    Sorry for my bad english.
    you can get more than 200 updates from ELM32xx processor
    im working in my own software and i can get the next refresh
    rates in VPW Protocol:

    Example 2000 Chevy Impala:
    NOTE: The speed may vary depending of all traffic of messages between
    the PCM and others modules

    VPW Generic Mode 10 PID's at 0.474 to 0.583 mS
    VPW Enhanced Mode 10 PID's at 0.822 to 0.912 mS
    PID for Engine RPM Generic Mode:
    Snd..........> 01 0C
    Rcv..........< 41 0C [0B 98] = 742 RPM

    PID for Engine RPM Enhanced Mode:
    Snd..........> 23 FA 5A 00 FF 01
    Rcv..........< 63 FA 5A 00 FF 01 [0A F8] = 702 RPM

    If you see the difference between Generic Mode and Enhanced Mode is
    two times more data in Enhanced Mode

    Now calculating and assuming that refresh rate of 10 PID's is about of
    0.600 mS (Generic Mode) you can get 1000 PID's per minute.

    IIRC, VPW is a lot faster than ISO (not sure if it's faster than the other protocol whose name I can't recall). 1000 wouldn't be bad at all, though if you read just the tach and speedo, that works out to about 8 updates a second. Add some other parameters to monitor, and it isn't all the smooth again.

    Though you could stagger the other ones, so you keep the tach and speedo fluid while still getting updates for other parameters at a slower rate.

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