[Ovmsdev] OBDII ECU Documentation, and a request for help

Greg D. gregd2350 at gmail.com
Wed Mar 28 07:45:38 HKT 2018

Hi Steve,

Ha, didn't know that.  Thought they were all DB's...  Thanks, corrected.


Stephen Casner wrote:
> Greg,
> A nit: The connector is more correctly identified as DA-26, see
> https://en.wikipedia.org/wiki/D-subminiature
>                                                         -- Steve
> On Tue, 27 Mar 2018, Greg D. wrote:
>> Hi folks
>> In a fit of prose, if not Shakespeare, I took a pass at creating the
>> documentation chapter for the OBD2ECU task.  Comments, corrections, and
>> general feedback is requested.  Is there anything significant missing?
>> Mark, if this looks acceptable, can it be posted to the Google Doc, or
>> send me an invite such that I can do so?
>> Note that I don't have any reference material on the OBDII-to-DB26
>> cable, other than the wiring.  If we eventually have a purchase source,
>> that should get referenced, or lacking that, perhaps pointers to where
>> the connectors can be purchased?  Placeholders are noted, but only
>> that.  For the EEs in the group, a question:  I have both signal and
>> chassis grounds connected together on the OBDII connector; should they
>> be, or just signal ground?
>> I think it would also be helpful to include a table of what metrics are
>> available (supported) on what vehicles, as an aid to those who want to
>> remap things for monitoring on an OBDII HUD or Dongle.  A glance at the
>> available documentation didn't turn up anything, so I took a first pass
>> at the table.  See the attached, which includes what I know of the
>> Roadster's implementation (since I have one and have studied the code a
>> bit).  I would rather not try to guess at the other cars.  Could the
>> various vehicle authors contribute their columns to the table?  Send me
>> an updated spreadsheet, and I will do the merge.
>> Thanks!
>> Greg
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