[Ovmsdev] Nissan Leaf ZE1 - Total loss of power

[Michael Geddes]

Thanks Wayne,
It looks like it's all in hardware territory now which is above my pay
grade too.  I'm curious if the stack trace from this last crash was helpful
or pointed at any area in particular?  I'm obviously especially interested
if it might have been due to issues with the poller.

//.ichael



On Tue, 8 Apr 2025 at 09:09, Wayne Love <wayne at gsjs.org> wrote:

> The firmware that I am running was built from my fork of the OVMS master,
> it is essentially equivalate to the master as it stands (I am up to date
> with commits as of this morning) but with some additional debug logging
> added.
>
> I mention the buffer overruns simply because the symptoms that I am having
> are similar.  The buffer overrun that you mention has been fixed,
> additionally I've also addressed the buffer overrun mentioned here [Ovmsdev]
> OVMS Poller module/singleton
> <http://lists.openvehicles.com/pipermail/ovmsdev/2025-February/016685.html> in
> pull request #1120.
>
> It is my theory from reading the investigations to date on this list and
> from personal experience, whenever the module does a hard crash (eg as
> above, memory corruption from a buffer overrun causes the CPU to crash)
> then the module has the potential of causing a number of errors on the CAN
> bus.  Temper this with the knowledge that I know absolutely nothing about
> CAN busses and automotive technology.
>
> I'm posting here so that wiser minds can put forward better theories.
>
> Thanks
> Wayne
>
> On Apr 8, 2025, at 10:20 AM, Michael Geddes <frog at bunyip.wheelycreek.net>
> wrote:
>
>
> Could you supply a version number?
>
> We did address the buffer issue.
>
> //.
>
> On Tue, 8 Apr 2025, 07:10 Wayne Love via OvmsDev, <
> ovmsdev at lists.openvehicles.com> wrote:
>
>> Just want to report another incident with a Leaf.  My wife was driving to
>> work this morning, according to her the Leaf started to display warning
>> messages and then did a full HV power shutdown with a "Service EV System"
>> "No Power" error.
>>
>> When I was able to get to her there were a number of DTC's being
>> reported, I was not able to clear these with LeafSpy even with the OVMS
>> module unplugged and had to disconnect the 12v battery.  This behavior is
>> consistent with the symptoms that I saw when the OVMS was crashing with a
>> buffer overrun.
>>
>> I'll have a look at the logs when she gets home tonight to see if there
>> are any indicators as to what is going on.
>>
>> Let me know if there are any specific investigative steps that I should
>> be following.
>>
>> Thanks
>> Wayne
>>
>> _______________________________________________
>> OvmsDev mailing list
>> OvmsDev at lists.openvehicles.com
>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>
>
>
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