I'd like to continue this post from Casper here. I've bought his car knowing that it had a problem. I have found a complete spare OBC module that I can use to replace the existing one, but I was also thinking to see if I could fix the problem before removing the existing module.
A little more about the problem first:
[*] The battery seems to be pretty much new. It was 11.8V float when I received the car so I started by charging it up. It sits around 12.8V now. I was expecting 13.8V but it was not to be.
[*] When the car is set to READY the charger kicks in... sometimes... The first time I tried it I simply got the battery light and then 5 seconds later the Exclamation mark. The second and third times, the battery light didn't come on for a little while, approx 10 and then 30 seconds. Eventually, when I took the capture below it was approx 80 seconds.
[*] Plugging in with Peugeot's DiagBox I took and cleared the fault codes, and start the measurements plugin. See below for the voltage curve measured at the ECU. What seems to be happening is that the charger is giving a too-high voltage, starting at around 14.6V and then heading slowly up to 14.7V. As soon as it hits 14.8V the charger shuts off (over voltage protection of some kind?). This curve is repeatable - if the charger kicks in at all. This morning it didn't even register on my multimeter as going over 13V.
The fault code is P0A09 Converter Fault
- that seems to be the result of the failed DC/DC converter.
I have not removed the OBC from the car yet. I also have not removed the bottom plate to have a look at capacitors or connectors yet. I thought someone here might have a good idea where to start looking.
One thing I did notice on the circuit diagrams is that there's some kind of connector in the wiring loom between the OBC and the battery. Any idea where this might be? It could be corrosion.
The only good picture I have of the charger circuit board is from Péter Varsányi, a Hungarian fella who did a great write-up on these chargers, also the newer replacement model. Use Google translate: https://villanyautosok.hu/2018/03/20/peugeot-ion-fedelzeti-tolto-javitasa/
So, does anyone have any idea where I would find the connector between the OBC and the battery, and secondly where should I look on the circuit board for some kind of regulator circuit?
Many thanks for the help!!
Copenhagen area, Denmark.