Gen1 DCDC Converter Troubleshooting and Repair

[Mykhaylo]

Hi, everybody!

Two weeks ago i bought dead Peugeot ION, this marking is plotted only in three place, another place have Mitsubishi)

I have a little experience with electronics, and after two days i found bad connection in CAN bus between BMU and CMU's, fixed it and deleted all DTC. After what my car can drive and charge. But i can't connect with OBC and DCDC modules. I use Launch X431, and when I scan devices OBC module answered, the icon turns green, but I can't read anything from it.
My auxiliary battery is OK, it charge (14.4v) in READY mode and when I connect external charger. I have check all connector from CAN2 to white socket in OBC plate, checked the oscillograms of the CAN signal. From all this, I conclude that the problem is in the CAN on the OBC board.

Do I understand correctly that the DCDC converter does not have a direct connection to the CAN? Can someone help me with the CAN circuit inside the OBC/DCDC module or other advice?

Ok, i have fix my problem.
I replaced IC704, TJA 1050, but i don't understand why it went down.

 

[kiev]

Well that is quite interesting and thank you for sharing the solution.

The TJA 1050 is the CAN Buss transceiver chip, and if it failed would definitely cause a lack of communication such as you experienced. Not sure that we have ever seen such a failure on the forum.

 

[Mykhaylo]

Not sure that we have ever seen such a failure on the forum.

I know) It was the latest that i change and now I haven't problem with CAN.
Now i definitely find a problem with battery cooling fun, P1AC1 and P1A2D. But it will be another topic.