[Ovmsdev] Another incident

[Michael Balzer]

Michael,

are you aware of these new findings by Richard Taylor?

https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/980#issuecomment-2715403436

Regards,
Michael


Am 22.03.25 um 03:26 schrieb Michael Geddes via OvmsDev:
> How are we going with this investigation?
>
> I've been following along mostly and have been periodically going over 
> the poller code trying to work out if there are any points where there 
> could be timing issues with long-held mutexes (or even deadlocks).  I 
> did push up some small tweaks recently but there was no aha! moment.
>
> I have been working on some changes that would move forward on the 
> idea of building a vehicle implementation from duktape scripts... and 
> I had been getting some points where ovms went berserk, kicked out the 
> ssh session and stopped responding on ssh http but then eventually 
> came back (without a reset) after some minutes. The script was simply 
> adding a new PollSeriesEntry which then uses the dbc decoder (with 
> improvements) to decode to metrics, noting that the script is setup 
> only and that there are no call-backs into the duktape engine/task.
> Anyway, those patches mentioned above seem to have resolved that issue 
> with the hangups which is why I made the p/r.
> BTW I have been running my Ioniq5 with the latest of the timing 
> patches for a while now.
>
> Because of the correlation of the bus issues with the poller changes, 
> I am still concerned that the poller changes are contributing to the 
> problem (even if not directly causing it), so would be happy to chase 
> down any leads people might have.
>
> //.ichael
>
> On Sat, 22 Feb 2025 at 02:52, Chris Box via OvmsDev 
> <ovmsdev at lists.openvehicles.com> wrote:
>
>>         Check your DTCs with leafspy, if it shows a bunch of DTCs
>>         including a B2604 BCM Shift PN diag, then likely low 12v, try
>>         a 24 hr charge or replace it.
>>
>     I did indeed have B2604-00, along with nineteen others. Most of
>     these mention CAN errors, and it seems plausible that low 12v
>     could be a common cause.
>     Do you think this rules out a poor OVMS OBDII connection? I'm
>     thinking if I have high resistance in that connector, then OVMS
>     will experience low voltage but the rest of the car modules will
>     have good voltage.
>     However I see codes that suggest communication errors between
>     Nissan modules:
>     C118C-01 ABS Brake: Malfunction is detected in VCM system. Control
>     module communication issue.
>     B2064-00 BCM Shift PN Diag CAN: Park-Neutral position switch
>     signal discrepancy
>     C1A70-01 BRAKE: Malfunction is detected in ABS actuator control
>     unit system
>     U1266-02 MULTI AV: Malfunction is detected between the AV control
>     unit and TCU
>     U0428-00 AVM: Invalid data received from steering angle sensor module
>     So I'm thinking perhaps the whole car briefly had low voltage.
>     To try to fix this, I cleaned the 12v battery terminals and
>     performed a long charge. After clearing the codes, I have only two
>     codes that reappear.
>     P317E-00 EV/HEV HV Battery System EVC-249 (perhaps caused by #1061
>     <https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/1061>)
>     U1A06-15 TCU Communication incorrect calibration (probably because
>     I've removed its antenna)
>     Chris
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>
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-- 
Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
Fon 02330 9104094 * Handy 0176 20698926

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