Last Friday evening got a call from Alexey from drive2.ru forum with Fiat 500e problem that was left for few weeks not used. 2015 Fiat 500e without U69 recall update, with dead 12V battery, not ready and not charging = over-discharged HV Battery. But where is the red turtle. With over discharged HV battery we should have at least “BPCM Fault” diagnostics trouble code on OBCM and PIM. In this case Alexey’s AlfaOBD running on ELM327 wifi shows no active faults/trouble codes.
First fast look at HV battery data shows not a HV Battery based problem. So after i have asked Alexey to perform 12V Power Down Procedure for half an hour to reset Fiat 500e i check logs from EVCU, OBCM and one more time back to Battery Pack Control Module log. Despite my almost 100% certainty, the “30minutes, 12V power off procedure” didn’t solve the problem. The situation is getting stranger every moment.
A closer look at battery data shows one stored problem that currently run & passed this cycle. It was car & battery Loss Of Isolation problem. We have reset isolation check fault with no resolutes again.
It takes me about two or three more hours to solve the problem. Which is quite bad time for this kind of problem. But on the other hand i have only AlfaOBD logs without remotely access to Fiat 500e with WiTech diagnostics program that i’m get used too.