Help for peugeot Ion 2012 that doesn't work.

[MickeyS70]

At the moment the car not charge because the charge sotps in few minutes without energy transfer (100W in the last charge by public charger) . I want to try if possible to use an EVSE settled with 6 Amps of charging current,

The car won't charge if cell voltages are fluctuating as indicated..

but i must move the car for reach a 230V power outlet...

You can tow it with all 4 wheels on the ground, key to position 'ACC' and gear in anything but P (ignore the waring in the manual)

yesturday i make some other test and had captured some data using CarScanner and CanIon.
Canion show all cells in a single screen but has a refresh time too much slow for see what happen when the error triggers

The data you see has already been processed by the BMU and is re-transmitted on the OBD bus. The data transfer on the internal BAT CAN between the BMU & CMU boards is faster, but not accessible without a CAN bridge.

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But I noticed that sometime, a single refresh cycle shows one or two cell with 2.1V (in yellow) an then the value returns immediatly at 3.8V.

That is a typical CMU fault, a reported 2.1V actually means no data received.

And sometime the level gauge on the dashboard of the car has level bars flashing, they sometimes disappears and reappear again. I was make a video , but in the time of record the gauge was regular....

Typical symptom of a CMU issue.

Now i want to make some graphs with data captured and chek if there are some useful information.

The most useful information is which cells voltages are fluctuating.

But the new 12V battery is coming and think to have in my hand only tomorrow, so i made last test with the poor battery with in parallel a good battery with cables. So not in an optimal environment.

Not ideal, if the car isn't in READY, all power is supplied by the 12V battery only, (low voltage can affect CMU boards).

 

[Franco Vecchi]

So maybe some problems on one CMU? is it already happened? I ordered also hardware for a canbridge based on arduino due, when it will be functional i will try to read can message on the BMU/CMU bus.
Actually i do not had an adeguate space for works inside battery, so i want make a good diagnostics first of dismount it.. ;-)

"That is a typical CMU fault, a reported 2.1V actually means no data received." It means that error P1A52 maybe caused by this random erratic value?

 

[MickeyS70]

So maybe some problems on one CMU?

Yes, most likely one (two) channels on CMU01

is it already appened?

Yes, this is a known issue, e.g. @alvinseven has a large thread about this topic
https://myimiev.com/threads/battery-pack-change-plans.5525/page-9

I ordered also hardware for a canbridge based on arduino due, when it will be functional i will try to read can message on the BMU/CMU bus.
Actually i do not had an adeguate space for works inside battery, so i want make a good diagnostics ;-)

That’s the main advantage of a CAN bridge, no need to remove the HV battery.

 

[Franco Vecchi]

Sorry for the many messages....
I see something maay be intersting in data captured yesturday:
in the first we have erratic temprature, 10 degrees is not true (2 -3-4 degrees is the real temprature)
in the second we have erratic voltage of some cells (2.1V and then 3.8 again) with no current (0A)
and see also the cell voltages on the current peak
in the third we can see the total voltage of battery vs. ca peak of current. From about 330 to 220V on a current peak of about 17A

All of this indicate some erratic voltage cell values (the 2.1 random with zero current) and that all cells are poor (also max cell voltage is lowering a lot on a current peak of < 20A).
I'm right?

 

[MickeyS70]

Sorry for the many messages....
I see something maay be intersting in data captured yesturday:
in the first we have erratic temprature, 10 degrees is not true (2 -3-4 degrees is the real temprature)

Strange, but this won’t stop the car from driving or charging, this ‘hotspot’ is reported by CMU04 and could also be faulty, keep an eye on it to see if these values remain constant @10deg or are always 6C higher than the rest.

I the second we have erratic voltage of some cells (2.1V and then 3.8 again) with no current (0A)

That’s a known issue (CMU problem) although I cannot see that on your video

and see also the cell voltages on the current peak
in the third we can see the total voltage of battery vs. ca peak of current. From about 330 to 220V on a current peak of about 17A
All of this indicate some erratic voltage cell values (the 2.1 random with zero current) and that all cells are poor (also max cell voltage is lowering a lot on a current peak of < 20A).
I'm right?

Yes, @ a mere 17A load min/max cell voltage drops to about 2.5V, which ties in with the total voltage of 220V DC i.e. all 88 cells seem affected.

A CAN bridge can take care of the second issue but will be no good if the cells themselves are weak, but I have never seen behaviour like that, so I’m not convinced that this is actually real.

I would still go ahead and install the bridge which should then allow to charge the battery fully and run more tests.

 

[Franco]

Strange, but this won’t stop the car from driving or charging, this ‘hotspot’ is reported by CMU04 and could also be faulty, keep an eye on it to see if these values remain constant @10deg or are always 6C higher than the rest.

That’s a known issue (CMU problem) although I cannot see that on your video

Yes, @ a mere 17A load min/max cell voltage drops to about 2.5V, which ties in with the total voltage of 220V DC i.e. all 88 cells seem affected.

A CAN bridge can take care of the second issue but will be no good if the cells themselves are weak, but I have never seen behaviour like that, so I’m not convinced that this is actually real.

I would still go ahead and install the bridge which should then allow to charge the battery fully and run more tests.

From experience a fluctuating value in the cell voltage is typical of a missing connection, sometimes even a defect in the CMU.

 

[Franco]

Here is the traffic on the CAN line between the batteries and the master BMS (under the driver's seat).
The second digit on the addresses is that of the various VCUs, from 1 to A (I have a 80s set), then from the first line of each from b2 the temperature values +50, finally the third and fourth lines are for the voltage values (here is the sniffing from my original battery).
A question: does anyone know the meaning and origin of the data on 3C2 and 3C3?

 

[MickeyS70]

The second digit on the addresses is that of the various VCUs, from 1 to A (I have a 80s set), then

CMU06 & 12 are not present, therefore you need to include ‘B’ also

A question: does anyone know the meaning and origin of the data on 3C2 and 3C3?

Iirc this is coming from the BMU and is related to balancing??

What I would do next is to filter for CMU01 msg only and see which cell voltages are fluctuating with no (or small load) and correct these.