Taupilz wrote:Hi, last status is now that the battery pack holds about 354V, but the condenser voltage is rising to 342V and falls down to 2V.
Is this fault also related to that the car will not charge?
Error codes are:
Since this car has an unknown previous history of repair attempts then nothing can be assumed as okay without checking and verifying, e.g. the wiring harness and connections between the EV-ECU and BMU, etc. There are multiple serious issues with overlapping extent between control units.
The U1100 indicates no CAN buss communication received by BMU from the EVECU, and the U1922 says that the backup K-Line communication between these two is not working either. Most likely a harness or connector issue but could be failed control units. I've never seen the failed K-line code before, and I think it is quite serious.
The P1AA7 is a new code on the forum, it indicates the signal sent by the EV-ECU through the CAN cannot be received by the BMU. The fail-safe or backup for this is to use the K-Line, but that doesn't seem to be working and threw the U1922. The probable causes are failed CAN buss, EV-ECU or BMU.
ref. Factory Service Manual P1AA7 page
The P1A15 is a MCU time-out code that may be set due to defective CAN buss or EV-ECU wiring or failure. I think it is a secondary issue considering the other codes, i.e. if the other codes are fixed then this code will go away. It is more likely an issue under the rear seat than a defect in the MCU in my opinion, but it could be that the MCU issue occurred first and subsequent attempts to repair have mangled the wiring under the seat such that additional codes are being thrown. If the communications were okay then only the MCU code would appear.
You will need to take good notes of what you check, find and verify in order to ring all this out.