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Thread: OBD II questions

  1. #11
    FLAC alti's Avatar
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    Quote Originally Posted by cyjad
    I'm working on the same problem. I've got a 96 Maxima and I've tapped into the OBDII port but this does not provide the same info as the Consult port (which is what the $3k Consult machines plugs into).

    Can you get any info through your friend about the workings of the Consult port...pinouts, codes, voltages, etc?

    I hear its complicated.

    Also, one could pay $400 and pickup nProbe which does pretty much the same thing as the Consult device.

    Check out:
    http://www.300degree.com/electronics/nprobe/

    Bringing this tread back

    Wondering what happens after 1999 with the consult???

    Anyone here have a 2000+ nissan with a OBDII ? If so which one? I have been roaming through the treads and have seen references to this one alot
    http://www.obddiagnostics.com/index.html
    I could not find nissan car compatibilty listed anywhere though. Anyone useing this setup in their 2000+ nissan?

    I am going to try asking my dealers service department too see if that gets me anywhere

    Thanks

    -B

  2. #12
    Raw Wave god_of_cpu's Avatar
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    I have a a 2003 infiniti G35 coupe. It is OBD II. You can connect to it using any ISO compiliant scantool. I use the one from scantool.net. The same should be true for ALL nissans made after 1996.

    The things like AutoTap or anything else for nissans, to my knowledge, don't offer anything above and beyond additional manufacturer specific trouble codes for nissans. i.e. they will give you a description for a manufacturer specific trouble code, where others would only give you the trouble code. I heard this is because of the consult scan tool which is proprietary and doesn't work the same as extended OBD II stuff. If you want to get any of the functionality of the consult, I don't think you'll be able to do it using OBD II extended codes. You would have have a consult device or get something that hacked the consult protocol like conZult, but this software is car specific (http://www.ooparts-international.com/id8.htm).

    I found a PDF online a while ago that described portions of the consult protocol, I can't seem to find it now, but I have the link in work, I'll try and post it on monday.

    I'm currently working on an OBD II plugin format and stevieg (OBDII / Elm MPG meter. Almost working but not quite!) will be making a program to use it that will do a bunch of stuff through standard OBD II. Eventually, if I find the time I will make a plugin that will use the consult interface instead, but I probably won't get around to this until May or so.
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  3. #13
    Constant Bitrate sagekoala's Avatar
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    Quote Originally Posted by cyjad
    I'm working on the same problem. I've got a 96 Maxima and I've tapped into the OBDII port but this does not provide the same info as the Consult port (which is what the $3k Consult machines plugs into).

    Can you get any info through your friend about the workings of the Consult port...pinouts, codes, voltages, etc?

    I hear its complicated.

    Also, one could pay $400 and pickup nProbe which does pretty much the same thing as the Consult device.

    Check out:
    http://www.300degree.com/electronics/nprobe/
    damn, that is tight ... who would need to monitor that many temperatures in their car at once?
    don't worry i know i usually don't make much sense

  4. #14
    FLAC alti's Avatar
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    God of cpu, thanks for the reply, I think that I am starting to peice this together.

    One thing that I am still confused on is the whole Consult thing. Do Nissans after 1999 have consult output as well as OBD II? Every link on consult seems to say that it only works for 1990-1999 nissans, but nothing newer. Did they do away with the consult protocol?? Or is it now just concidered extended output on the OBD II?? Also does consult plugin to the same conector as OBD II? Or is there a seperate connector?

    The other thing that I am tring to understand is what is actually outputed by just the OBD II in a nissan do you get : Status of onboard tests , Fuel system status, Engine load, Coolant temperature, Fuel Trim (Long and short term), Manifold Pressure, Engine Rpm, Vehicle speed, Ignition timing advance, Intake air temperature, Intake air flow rate, Throttle position, Secondary air status, Oxygen sensor locations, Oxygen sensor voltages, --> or are thease concidered part of the extended output of the consult.

    Thanks again for all the help.

  5. #15
    Raw Wave god_of_cpu's Avatar
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    I believe all those things are standard Mode 1 OBD II codes http://obddiagnostics.com/obdinfo/pids1-2.html . YOu can read quite a few things with OBD II, the major limitations I think it has are:

    1. Its slow, around 3 updates a second vs probably around 30 or more for consult
    2. It only have 30 or so things to monitor and doesnt have things like odometer or direct mpg readings although you can estimate these from other parameters
    3. It's read only for the most part, you can only reset the check engine light, you can't change fuel mappings or anything else
    4. You can't do the really cool proprietary things that the consult does like change your light auto-off feature etc.


    There are two versions of the consult protocol, consult and consult 2. I'm not sure what year they switched over to consult 2, but 1999 is probably a good guess. Yes all nissans after 1999 use some form of the consult, probably all use consult 2. I know my car is consult 2 and OBD II. The consult uses the same port as OBD II, however, it uses different wires on that port, OBD II only needs like 4 or so wires to get all the information, there are like 10 or 16 on a standard diagnostic port so the others are generally used for a proprietary protocol, like the consult. All cars made after 1996 are required by law to have a standard OBD II data port located near the steering wheel some place and support all the standard PIDs.

    Quote Originally Posted by alti
    God of cpu, thanks for the reply, I think that I am starting to peice this together.

    One thing that I am still confused on is the whole Consult thing. Do Nissans after 1999 have consult output as well as OBD II? Every link on consult seems to say that it only works for 1990-1999 nissans, but nothing newer. Did they do away with the consult protocol?? Or is it now just concidered extended output on the OBD II?? Also does consult plugin to the same conector as OBD II? Or is there a seperate connector?

    The other thing that I am tring to understand is what is actually outputed by just the OBD II in a nissan do you get : Status of onboard tests , Fuel system status, Engine load, Coolant temperature, Fuel Trim (Long and short term), Manifold Pressure, Engine Rpm, Vehicle speed, Ignition timing advance, Intake air temperature, Intake air flow rate, Throttle position, Secondary air status, Oxygen sensor locations, Oxygen sensor voltages, --> or are thease concidered part of the extended output of the consult.

    Thanks again for all the help.
    StreetDeck.com Developer (I am Chuck)
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  6. #16
    FLAC alti's Avatar
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    Thanks

    That helped alot going to run some searches on Consult/Consult2 will post anything cool that I find.

    One other question. I noticed almost all of the sites that sell OBD II conectors have there software open for download. Does it matter what program you use to interpit the data. Or can you use any cable with any software (OBD II)? I am guess that the data is passed from the OBD II in some kind of structured or delinated format so the Apps GUI does not matter as long as the information gets passed to the correct varibles and displayed???

    Sorry if im way off on this, the core of what I am looking to know is if it matters what cable i get now as for as what softwares will work with it and if i decide to try something myself (I have been tooling around with VB and C++ for some time)

    -B

  7. #17
    Raw Wave god_of_cpu's Avatar
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    The software you need is hardware specific, however, different software cables / devices that use the same chip can use the same hardware. i.e. the ELM323 is a chip that converts the OBD II signal into ascii data sent to the serial port and is used in various implementations of OBD II to serial converters all vendors that use this chip, i.e. scantool.net can use the same software, however, not all vendors use this chip. OBD II does establish some data structures for the stuff it sends, but most of the hardware reformats this in some way, but the same data is still represented. I.e. the binary representation can change, but you still getting header data and actual data. The elm, for example, converts the actual binary representation into hexidecimal ascii so you can talk to it through just a terminal program.

    The need for different software for different hardware is one of my main goals with the plugin format I'm writing (OBDII / Elm MPG meter. Almost working but not quite!). It is just a dll that is callable from VB, C++ or any language and establishs a common high level API that you can write to once and your OBD II software will then work with whatever devices plugins are available for it. Currently I have only written them for ELM323 hardware and a faker plugin that generates fake data from log files. I do plan to write at least one more plugin for the obddiagnostics.com hardware though. IF you do go the programming route I encourage you to look at my plugin, its completely open source and free to use in any program.
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  8. #18
    FLAC alti's Avatar
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    You Rock

    God_of_cpu you rock!

    Thanks, feel confident enough for the hardware purchase.

    Was / is that firebird a 305/350? My first car was an '83 Trans Am and I also had a '84 firebird. Loved thoose cars.

    Thanks again

  9. #19
    Raw Wave god_of_cpu's Avatar
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    No, the firebird was all rice. It had the V6 engine and didn't put out much more then 100 hp. It looked and sounded real fast thanks to my performance enhancing rusted exhaust pipes and flames and people tried to race me from stop lights all the time. We would both floor it. At the end of the race, they would look behind them and I would be so far behind it would look like I didn't even try. I just started painting the car for fun, but it ended up being a much more time consuming project then I thought it would be. The good thing was I never got speeding tickets in it. Thats changed a lot since I tripled my horsepower with my g35 though
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  10. #20
    Raw Wave god_of_cpu's Avatar
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    This thread has the PDFs describing the consult interface attached.

    Non OBD solutions...
    StreetDeck.com Developer (I am Chuck)
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