We haven't seen or heard much from any Japanese owners so this was very interesting to see the various types of charging stations available there, and also the "mode1" charging cable.miggols99 wrote: ↑Mon Sep 19, 2022 9:08 pm ...
(my car shows the exact same symptoms...i.e. a dying OBC)
They told me that error codes P1A2F and P1A4B (Malfunction of the BMU traction battery cell system) are showing up, and I would have to pay over 1 million yen ($7,000 USD at the current rate) to replace the traction battery, which is obviously unrealistic for a car I bought at more than half of that :roll:
If the OBC fails completely, it would qualify for a service campaign they say...
I have been getting "cell voltages difference too large" errors as shown in Hobdrive, so I may need to do a few "calibration" charges.
The charging stand I use most frequently has an unusual charging curve, as it doesn't seem to taper off much at all when reaching a higher SOC, so I am not sure cell balancing is taking place.
Before the OBC is activated there is a communication signal between the EVSE and the car. If there is anything sensed as being incorrect in this signal, then the session will fail and no charging occur. This is not the same as an OBC hard failure due to blown components. The various EVSE manufacturers may have implemented the protocol in different manners such that some don't work with the imiev. This happens with the Nissan Laef also, some work and others don't.
About the DTCs:
If the BMU gets a voltage reading from a CMU that a cell(s) have more than 0.2 V difference from the rest, then it throws the P1A4B code to the EVCU, which then throws the P1A2F, so those 2 codes are just the same fault. So there is likely one or more cells that are weaker than the rest, and most any of the OBDII scanners or phone apps can read and display the cell voltages to determine which are the culprits.
The pack and cells were designed and assembled to be easily serviceable, but the Mitsubishi Service Manual does not pursue that repair path, it just indicates to replace the entire pack. That is quite a wasteful approach, but it is a safe repair strategy from both a technical and legal liability view .