[Ovmsdev] Hi from a new comer

[Michael Balzer]

Didier,

Am 05.01.21 um 21:04 schrieb didier at ernotte.com:
> Hi,
>
> I have found a lot of info like this in the tech doc I have
>
> "
> Using the Jaguar Land Rover approved diagnostic equipment, check 
> datalogger signal – Vehicle Speed (0xDD09) Ensure that vehicle speed 
> is transmitted and updated correctly. Clear the DTCs and retest. If 
> fault persist using the Jaguar Land Rover Approved Diagnostic 
> Equipment, reconfigure the door module with the latest level software. 
> Clear the DTCs and retest
>
> "
>
> What do you think I can do with the info "0xDD09" ? a PID ?

Presumably. Try it. As it's a 16 bit PID, you'll probably need poll type 
22, so that would be:

obdii can1 request broadcast 22dd09


> The communications networks available on the vehicle are shown below:
> - High Speed (HS) CAN chassis systems bus

> - HS CAN body systems bus

> - HS CAN Human Machine Interface (HMI) systems bus
> - HS CAN power mode zero systems bus

> - Flexray

> - Local Interconnect Network (LIN)

> - Private bus

That's a log of networks. You probably won't be able to access all of 
them at the ODB port.

> - the copen scan does not do anything

If it doesn't _do_ anything, you didn't do it right. If it doesn't 
_find_ anything, you don't have CANopen nodes, so can concentrate on 
OBD/UDS.

> - the "obdii can1 request broadcast 0100", (and 0120, 0140, 0160, 
> 0180...) returned a 32 bits that I can decode to identify which PID is 
> supported, but only one ECU (7df) answered to the broadcast. I guess 
> there is many other, but they don't respond to the broadcast.

7DF isn't an ECU, it's the broadcast address. You currently need to 
enable the CAN logger to see the origin address. It's normal only one 
device responds to broadcasts. You need to find the other devices by 
scanning for them.

> I don't understand why the "re obdii scan start 1 7df 0 20" does not 
> give me an anser for the identifyed PID of the previous "broadcast" 
> command .

Because you need to specify the RX ID range you're expecting, the PID 
scanner doesn't set that automatically. In this case, you'd do:

re obdii scan start 1 7df 0 20 -r7e8-7ef

…or…

re obdii scan start 1 7df 0 20 -r600-7ff

…to check for responses outside the standard.

> In the broadcast command, when we send "0100", the first byte seems to 
> be a "mode", and the second the PID, is it correct ? (as described in 
> the vehicle.h).
> I still don't see how I can have a full list of ECU ID, and a full 
> list of PID for each ECU. Maybe that is why retro engineering is complex,

That is correct, and you get a full list by scanning.

> I don't also understand the impact of selecting a vehicle in the web 
> session. Since my Jaguar is not supported yet, I select the OBDII car 
> , but if I select the nissan leaf, I can see more data, which does not 
> make sense, unless we ned to "wake up" some ECU in order to pull some 
> info. Is the OVMS device masking some data in the bus? how can I see 
> everything on the bus ?

Selecting a vehicle activates the special CAN & OBD handling that is 
implemented for that vehicle already. Since your car isn't supported, 
you should select the empty vehicle (code NONE). The OBD vehicle polls 
some standard PIDs, which can interfere with RE scans.

You can see everything on the bus with the CAN logging & monitoring & 
streaming commands. See the documentation links I gave you in my first post.

Regards,
Michael


> Thanks for your help.
> I will definitively take a look at your new page.
>
> Didier
>
>
> Le lundi 4 janvier 2021 15 h 28 min 10 s UTC−5, Michael Balzer 
> <dexter at expeedo.de> a écrit :
>
>
> Didier,
>
> Am 31.12.20 um 10:47 schrieb Michael Balzer:
> > Most OBD2 devices won't respond to broadcasts though. To identify
> > them, you need to send a test request to all CAN IDs in your assumed
> > ID range. The scan tools for this are below "re obdii scan":
>
> I've just added a first UI for that scanner:
> https://docs.openvehicles.com/en/latest/plugin/repidscan/README.html 
> <https://docs.openvehicles.com/en/latest/plugin/repidscan/README.html>
>
> Feedback is welcome.
>
>
> Regards,
> Michael
>
> -- 
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>
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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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