Not fully on-topic, but very interesting nevertheless:
- osexpert has ported the clara software to the china CCS-chademo-adapter. Seems to run quite well.
- The missing battery voltage is estimated based on the announced max voltage(?) and the SOC. This is not perfect, but good enough.

Github ...

* I would consider the "P-CAN Bus off" and related P-CAN errors still as critical error. A stable communication on the P-CAN is essential to drive. Maybe you find somebody with a CANoe/CANalyzer for detailled bus logging, or just SavvyCAN to get an impression what is going on.
* The "E-comp ...

In this case the first check is the physical connection:
Resistance between CANH and CANL between 60 and 120ohms? Grounds connected? Do you have an oscilloscope to check the CAN lines? Baud rate correctly configured?

Do you know, whether in this case the software version of the modem was reported with "Bootloader" on the serial console?

Is the ESP connected via CAN or is it directly on the inverters logic board?

Did someone say "crack CRC"? Not too difficult if we have a long CAN trace

No, the capacitors need to be added "on top" (literally).

This would also need independent power supply, how do you plan these?

Is the tool able to show a time stamp of the DTCs? Maybe they are old ones, which just need to be cleared? Or do they come back?

Link to external pictures are not recommended.
Click on "Full Editor & Preview", scroll down to the "options/attachments" section, click "Attachments", "Add files", "Place inline".

I can only talk for the Ioniq (which is very similar). The EPCU starts talking on the PCAN as soon as it has 12V power on the right pins. This works on my desk with nothing else connected. So first points to check: Does the 12V arrive at the EPCU? And measure the resistance between PCAN H and L and ...

Nice What hardware is this? How long does it boot?

Another direction of thinking: At which voltage the flying ADC is flying, before any of the mux switches are activated? By which path is this voltage determined?
- into direction of chassis ground, it is isolated via the 5V/5V DCDC and the data isolators. Fine.
- into direction of battery, the ...

Maybe go with 2k2 || 10nF, and look what the statistics will say.
And reduce the cell drain by reducing the sampling frequency. Maybe introducing two modes with A: fast sampling, higher drain and B: slow sampling, low drain, so depending on the use case everybody can optimize just by setting a ...

Hm, I'm not really convinced of my assumption anymore.
The C_iso is around 1pF (https://www.mouser.com/datasheet/2/143/201407061738295695-365680.pdf?srsltid=AfmBOopPifesTEXY3mg_iVku998wjONe_E4pSM_K1cZTZHM5gYtOZNbV) and the C_gs specified as "max 600pF" (http://www.stansontech.com/download/Trench ...

With the 4 blocks not interconnected I observed nothing strange. So I connected them all with 500 Ohm in between and measured across one of them with the scope to be able to see any unwanted current spikes. Nothing.


That's a good starting point. In theory, nothing should break even if we inject ...

Just remove all components which are connected to the TX lines of the QCA, and measurse both TX lines with oscilloscope.

Cross-linking to the progress regarding charge port for AC and CC charging: viewtopic.php?p=82399#p82399

Cross-linking the flash-images for the QCA7005 in EVSE mode: viewtopic.php?p=33730#p33730

Thanks, I missed this.
Measured the transmit amplitudes using a Foccci 1.0 board, with the aliexpress EVSE_1 and 2, and the Ioniq configuration, which we use on Foccci normally.
The aliexpress configuration has lower transmit power, but still very well visible on oscilloscope.

Summary: each ...

Maybe the flash image contains a configuration with very small transmit power? Would it help that you share the image, so we can give a try with our boards?

I have 5 cards and they all behave the same way


This could also point to wrong components, e.g. C10 with 220nF instead of 220pF or something similar. You could compare the signals directly on the TXOUT_P and TXOUT_N, with the signal on the C10 and the signal on the CP line. And if nothing helps ...

Usually this is the result of soldering issues, like shortcut or open circuirt in the RF path. Some voltages and resistances to be checked are mentioned in the trouble shooting guide https://github.com/uhi22/foccci#no-communication-with-the-charger-possible
On some V5 boards we have seen shortcuts ...

Which kind of EV is using J1939?

Not sure whether it helps, but google found some information regarding battery data in J1939:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiBqtDGk7-NAxV3gP0HHSnSI-cQFnoECCwQAQ&url=https%3A%2F%2Fwww.adelsystem.com%2Fen%2Fdownload.php%3Ft%3Dadditionaldata ...