[Ovmsdev] OBD extended diag session

Michael Balzer dexter at expeedo.de
Tue Aug 18 17:54:22 HKT 2020


was the charger actually working, i.e. charge in progress? If not, maybe
it goes asleep as soon as the 12V aux battery is topped off, and another
ignition state change simply reactivates the topping off cycle.


Am 16.08.20 um 16:28 schrieb Soko:
> Hi guys,
> Question for the CAN and ECU experts:
> I am logging into the battery charger ECU on my eUp via the extended
> diag session code. Otherwise I get 7F as reply.
> I am interested in the power efficiency (pe) and power loss (pl) values.
> It seems though as they have another timeout than the ext diag session
> as I am polling it every 5 seconds. So ext diag is "always on".
> But after 20 minutes during charging the values change from the
> realistic ones to pe=100% and pl=0. To get the real values back I have
> to unlock the car and turn the ignition. Then I can turn off and lock
> the car again.
> Now to the question: Is this behaviour somehow known from other
> vehicles as well or can it be an error in my code not sending the ext
> diag msg correctly?
> Although when I dont send it at all I dont get even a value for pe and
> pl, just the 7F error msg.
> So do you think it is possible to get those values for longer than 20
> mins without having to turn the ignition? Or am I out of luck here as
> it seems to be some VW specific thing...
> thx
> Soko
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Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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