Page 4 of 5 FirstFirst 12345 LastLast
Results 31 to 40 of 43

Thread: Multiple ECU responses

  1. #31
    VENDOR - ScanTool Vitaliy's Avatar
    Join Date
    Dec 2006
    Location
    Phoenix, AZ
    Posts
    624
    Quote Originally Posted by Nitroking View Post
    Vitaliy:

    Did some testing today in the same car:

    >ATDP
    AUTO, ISO 9141-2 (as I thought)

    ATSH 4C F1 10
    OK

    0105
    NO DATA

    So again, it is not working.. Any ideas?
    You're probably out of luck, with this vehicle. Physical addressing should work with KWP, however.

    I believe I've said before that there isn't much benefit to using physical addressing. Just filter out the responses you want, in your software.

    If your main goal is better performance, OBDLink can give you faster updates on ISO, out of the box. As an added bonus, it allows you to set up filters that block unwanted messages on any protocol (not just CAN).

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
    Need to look up a diagnostic trouble code? Try the most up-to-date, free DTCsearch.com!

    You cannot send me a private message using this forum. Use my email instead: vitaliy[@]scantool.net.

  2. #32
    Low Bitrate
    Join Date
    Aug 2010
    Posts
    68
    Yeah that's what I finally did.. Filtering in code.. And today it worked on a hybrid Civic with 4 computers!! Probably ECU, TCU, electronic motor control unit and battery controller unit..! It has ISO 15765-4 (CAN 29/500) with 4 header bytes.... I thought it would have the standar 7Ex header but it was different, however with proper code I managed to get it to work..

    Do you have any link where I can see the standards for each protocol? I would like to see the headers actually..

  3. #33
    VENDOR - ScanTool Vitaliy's Avatar
    Join Date
    Dec 2006
    Location
    Phoenix, AZ
    Posts
    624
    Quote Originally Posted by Nitroking View Post
    Yeah that's what I finally did.. Filtering in code.. And today it worked on a hybrid Civic with 4 computers!! Probably ECU, TCU, electronic motor control unit and battery controller unit..! It has ISO 15765-4 (CAN 29/500) with 4 header bytes.... I thought it would have the standar 7Ex header but it was different, however with proper code I managed to get it to work..

    Do you have any link where I can see the standards for each protocol? I would like to see the headers actually..
    SAE J1979
    SAE J2178
    ISO 15765
    ISO 9141
    ISO 14230

    SAE and ISO hold copyrights on these standards, they are not in the public domain.

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
    Need to look up a diagnostic trouble code? Try the most up-to-date, free DTCsearch.com!

    You cannot send me a private message using this forum. Use my email instead: vitaliy[@]scantool.net.

  4. #34
    Low Bitrate
    Join Date
    Aug 2010
    Posts
    68
    So you don't have any links right?

    Why does someone have to pay for those? I thought those are just standards which have to be open to the public so they can understand what's going on in the car.. It's like a country having its citizens pay to know their rights.. ??

  5. #35
    North of the land of Hey Huns
    Auto Apps:loading...

    Join Date
    Jun 2004
    Location
    Westminster, MD
    Posts
    2,127
    Standards are not your rights, standards are a list of requirements that automotive makers abide by. If you were to build your own car, you'd have to purchase these from the maintaining body so as to comply with the standards.

    You can also purchase them as an individual, but regardless they're not free.
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
    RevFE
    My Shop

  6. #36
    Low Bitrate
    Join Date
    Aug 2010
    Posts
    68
    OK, I had it in my mind as something like a law so that's why I thought it should be free.. Nevermind!

  7. #37
    Newbie
    Join Date
    Jan 2011
    Posts
    2
    1Hello,
    I have a similar "problem"

    I've tested an iPhone App with an ElmCan OBD WiFi OBD Link.

    In an VW Lupo 3L built in 2002 it works fine and when I have Headers on, every message begins with 80xxx

    Then I wanted to test in an BMW 335i from 2008 and it didn't work

    Then I saw that every time I get a Message there are 2
    One from ECU #1 7E8 and one from ECU #2 7EC

    So i decided to use "AT SH 7E0" to only send messages to ECU #1

    Is ECU #1 always the engine management and does it have the most information for me?

    And in my Lupo I trief "AT SH 7E0" and always become NO DATA. Can't I send data to the ECU with 7Ex if there is only one like in my Lupo?
    Seems like my Lupo just hast ISO oder KWP. What do I have to set in AT SH xxx?

    Thanks Chris

  8. #38
    North of the land of Hey Huns
    Auto Apps:loading...

    Join Date
    Jun 2004
    Location
    Westminster, MD
    Posts
    2,127
    Quote Originally Posted by Nitroking View Post
    OK, I had it in my mind as something like a law so that's why I thought it should be free.. Nevermind!

    It's law that they abide by a certain set of rules, and the rules I believe are publicly available, but im fairly certain the protocol definitions aren't included in the law.
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
    RevFE
    My Shop

  9. #39
    VENDOR - ScanTool Vitaliy's Avatar
    Join Date
    Dec 2006
    Location
    Phoenix, AZ
    Posts
    624
    Quote Originally Posted by klist View Post

    Is ECU #1 always the engine management and does it have the most information for me?
    This question has already been answered earlier in the thread. It's not a simple yes/no, so you have to go back and actually read it.

    And in my Lupo I trief "AT SH 7E0" and always become NO DATA. Can't I send data to the ECU with 7Ex if there is only one like in my Lupo?
    Seems like my Lupo just hast ISO oder KWP. What do I have to set in AT SH xxx?

    Thanks Chris
    You're mixing different protocols (11-bit CAN and KWP). If you only have one ECU responding to a functional request, there is no reason to use physical addressing. If you insist on using physical addressing with KWP, you need to first find out what the ECU address is (look at the "source address" byte of the header).

    It's all been explained already, you should go back and read the answers. I'm not trying to be a jerk, but it's just a better use of everyone's time if you read the explanations and ask questions about the parts that you don't understand. If we regurgitate the answers for you, it will take longer and pollute the thread.

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
    Need to look up a diagnostic trouble code? Try the most up-to-date, free DTCsearch.com!

    You cannot send me a private message using this forum. Use my email instead: vitaliy[@]scantool.net.

  10. #40
    Low Bitrate
    Join Date
    Aug 2010
    Posts
    68
    Hey chris, if you see the thread you'll find the answers and if you try it all first and not work, we're here to help as much as we can.. FIY I tried ATSH for KWP and ISO-9141-2 but it didn't work and finally I decided to filter it by coding.. It works fine now even if the car has 4 ECUs!

Page 4 of 5 FirstFirst 12345 LastLast

Similar Threads

  1. Replies: 0
    Last Post: 04-27-2009, 05:36 PM
  2. Multiple ECU responses
    By mctodd00 in forum Engine Management, OBD-II, Engine Diagnostics, etc.
    Replies: 3
    Last Post: 11-16-2008, 08:16 AM
  3. ECU passes emission test with bad O2 reading?
    By Leandra in forum Engine Management, OBD-II, Engine Diagnostics, etc.
    Replies: 0
    Last Post: 03-14-2008, 10:50 PM
  4. Replies: 3
    Last Post: 08-11-2007, 03:22 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •