Following up from the thread trying to dig into what code was being asserted: https://www.smartcarofamerica.com/t...hreads/2018-smart-fortwo-ev-453-obd2-software-or-retrieving-codes.162505/unread
Finally got to the bottom of it and discovered the above P0463F1 code as persistent (now for 2-1/2... 3 weeks of daily driving). All throughout, I've confirmed that everything still seems normal - all temperatures have been fine (charger, motor, battery), but the code persists, annoyingly preventing me from using cruise control (weird relationship). It also gives a scary "Malfunction - visit workshop" message every time I start the car.
![Image]()
I've dug and dug... I acquired a copy of the Mercedes service software to try digging through procedures, but found it to be scattered and incomplete - for example, the blower for the motor cooling is entirely omitted from guides & lookup, can't find any coherent search function, and I can't find any clear "overview" of subjects like the cooling system loop. In the parts catalog, there appear to be TWO pumps - one, the obvious power electronics cooling pump - but the other? High voltage battery cooling pump... where even is that? Is it INSIDE the battery? I can't find anything explaining the location of these parts. Tight photos without positional context, of an unfamiliar underbody that I can't correlate to anything actually seen under the car. And nothing up top (in the trunk) seems to match up either...
![Image]()
The one pump I can see, is haphazardly mounted on a small bracket in the vehicle rear (and is that an OEM zip tie holding it on?!)... as if they almost forgot to include it or something. It's whirring away, and as usual, coolant spritzes into the reservoir in the front as normal. The connector for the pump has a very strange latch that I can't figure out how to un-latch - it has a green spring-loaded element with a perpendicular-to-insertion element to it, slides in and out on a spring, very tight and hard to press, but pressing it (all the way to the bottom) doesn't help unlock it. Nasty German finger-hurting puzzle games. If I could unplug it, at least I could generate a potentially 2nd fault code, or confirm whether it's the pump being complained about, but I can't get it free.
![Image]()
Anyone dealt with this before? I can only hope there's someone else out there that's dealt with a 453's cooling system before...
Finally got to the bottom of it and discovered the above P0463F1 code as persistent (now for 2-1/2... 3 weeks of daily driving). All throughout, I've confirmed that everything still seems normal - all temperatures have been fine (charger, motor, battery), but the code persists, annoyingly preventing me from using cruise control (weird relationship). It also gives a scary "Malfunction - visit workshop" message every time I start the car.
I've dug and dug... I acquired a copy of the Mercedes service software to try digging through procedures, but found it to be scattered and incomplete - for example, the blower for the motor cooling is entirely omitted from guides & lookup, can't find any coherent search function, and I can't find any clear "overview" of subjects like the cooling system loop. In the parts catalog, there appear to be TWO pumps - one, the obvious power electronics cooling pump - but the other? High voltage battery cooling pump... where even is that? Is it INSIDE the battery? I can't find anything explaining the location of these parts. Tight photos without positional context, of an unfamiliar underbody that I can't correlate to anything actually seen under the car. And nothing up top (in the trunk) seems to match up either...
The one pump I can see, is haphazardly mounted on a small bracket in the vehicle rear (and is that an OEM zip tie holding it on?!)... as if they almost forgot to include it or something. It's whirring away, and as usual, coolant spritzes into the reservoir in the front as normal. The connector for the pump has a very strange latch that I can't figure out how to un-latch - it has a green spring-loaded element with a perpendicular-to-insertion element to it, slides in and out on a spring, very tight and hard to press, but pressing it (all the way to the bottom) doesn't help unlock it. Nasty German finger-hurting puzzle games. If I could unplug it, at least I could generate a potentially 2nd fault code, or confirm whether it's the pump being complained about, but I can't get it free.
Anyone dealt with this before? I can only hope there's someone else out there that's dealt with a 453's cooling system before...
