C
[email protected]
Guest
Yeah, I saw the posts to the 250 dollars CDs .... the site doesn't
exist anymore, suprisingky enough !
The elm chip is very good by the look of it, however it can't do any
more that standard OBDII stuff. What I have read about is modifying a
standard OBDII scanner to make it a K-Line monitor, which I think may
be a step in the right direction. Does anybody know how to do this? I
do know that LR use 3 channels, with K & L lines for each of them, I
also know the DLC pins that carry each signal.
Chris.
Warwick Barnes wrote:
> There used to be a chap on the web offering the test book CDs for 250
> dollers or pounds.
>
> most of the cheap gizmos sold are just voltage level shifters between
> RS232 computer serial and the ecu. The circuit is not rocket science and
> appears many times at various sites. Much harder is the software as
> messages are transmitted in fairly complex packages. You have to send
> specific requests to the ecu, again as complex packages, to which the
> ecu responds.
> The transmition speed for ISO was incresed at some point and ISTR that
> the higher speed message packages were different in some way.
>
> Originally the RR used ISO 9141, there are about 4 essential papers
> about this standard which cost about 180 UKP from British Standards
> Institute, then for OBDii you need the Society of Automotive engineers
> (USA) Manual for onboard diagnostics about 70 UKP (I think Amazon listed
> it possibly Amazon.com not UK) There are also manufacturer specific
> codes in OBDii but listings I have seen suggest that the classic RR just
> mirrored the standard codes for these.
>
> If you go to the next stage on, LR used GEMS and you can/could download
> ecu reader software from their web site,
>
> Once you get to the time of the BECM package you run into more problems
> as ISTR there are about 8 computers tagged into a common bus, and it
> used other bus standards as well as ISO9141 protocol, and other pins in
> the OBDii connector to talk to the various systems.
>
> I have some notes on the diagnostic pin output for the Lucas 14cux,
> which I might just get round to loading onto my site.
>
> I also need to update the ecu links as I have megabytes of stuff on my
> harddrive, drop us an email I might just be persuaded to copy it all to
> a Cd and send it to you, but lots of bad medical vibes in the family at
> moment so I might be some time getting round to it.
>
> The Elm package is ISTR just a level shifter, covers Ford, GM and ISO
> protocols, but they have a good website/forum at scantool.net I think.
>
> --
> If you received this through the miracle of modern technology then all
> is well; if not then situation normal.
> Chris father of
( also at [email protected] )
> www.users.zetnet.co.uk/barnes_firsnorton
exist anymore, suprisingky enough !
The elm chip is very good by the look of it, however it can't do any
more that standard OBDII stuff. What I have read about is modifying a
standard OBDII scanner to make it a K-Line monitor, which I think may
be a step in the right direction. Does anybody know how to do this? I
do know that LR use 3 channels, with K & L lines for each of them, I
also know the DLC pins that carry each signal.
Chris.
Warwick Barnes wrote:
> There used to be a chap on the web offering the test book CDs for 250
> dollers or pounds.
>
> most of the cheap gizmos sold are just voltage level shifters between
> RS232 computer serial and the ecu. The circuit is not rocket science and
> appears many times at various sites. Much harder is the software as
> messages are transmitted in fairly complex packages. You have to send
> specific requests to the ecu, again as complex packages, to which the
> ecu responds.
> The transmition speed for ISO was incresed at some point and ISTR that
> the higher speed message packages were different in some way.
>
> Originally the RR used ISO 9141, there are about 4 essential papers
> about this standard which cost about 180 UKP from British Standards
> Institute, then for OBDii you need the Society of Automotive engineers
> (USA) Manual for onboard diagnostics about 70 UKP (I think Amazon listed
> it possibly Amazon.com not UK) There are also manufacturer specific
> codes in OBDii but listings I have seen suggest that the classic RR just
> mirrored the standard codes for these.
>
> If you go to the next stage on, LR used GEMS and you can/could download
> ecu reader software from their web site,
>
> Once you get to the time of the BECM package you run into more problems
> as ISTR there are about 8 computers tagged into a common bus, and it
> used other bus standards as well as ISO9141 protocol, and other pins in
> the OBDii connector to talk to the various systems.
>
> I have some notes on the diagnostic pin output for the Lucas 14cux,
> which I might just get round to loading onto my site.
>
> I also need to update the ecu links as I have megabytes of stuff on my
> harddrive, drop us an email I might just be persuaded to copy it all to
> a Cd and send it to you, but lots of bad medical vibes in the family at
> moment so I might be some time getting round to it.
>
> The Elm package is ISTR just a level shifter, covers Ford, GM and ISO
> protocols, but they have a good website/forum at scantool.net I think.
>
> --
> If you received this through the miracle of modern technology then all
> is well; if not then situation normal.
> Chris father of
( also at [email protected] )> www.users.zetnet.co.uk/barnes_firsnorton
