But now lets see what we need to install to the PC to be able to tune the ms41 control units.
#Ecu tuning basics software#
This includes the modded cable and all of the BMW software for 15€ Yes. This particular one came in already modded so this works fine with INPA etc.
#Ecu tuning basics code#
No modifications needed for this but bridge pins 7 and 8 for fault code reading. But for recap this adapter is just 5€ and little bit of modification to it. Of course you will need some software to your PC for this. So 5 Euro adapter and connect this usb to your laptop and you are ready. But if you have *** KKL adapter and bridge then pins 7 and 8 you can use these to read fault codes and do all kinds of useful stuff. For this use you don't need to modify these in any way. These are something like 5 Euros if ordered from china through eBay. I have these kind of *** KKL OBDII adapters and this seems to say BMW KKL. And that can be done using standard usb-obdII adapter. But of course you will need to connect this to your PC also. But in my setup I can't flash in this position. But if you only use this for flashing, then you could permanently solder wire between those pins. So now when I lift this switch I will enable the flash voltage by bridging those pins.
But I use this also for reading fault codes etc. If you only use this for tuning you could permanently attach wire between those pins. Which provides +12v to flash enable pin in the control unit. And to be able to flash the control unit you have to run wire from pin 14 to pin 18. First you will need adapter from the round BMW plug to normal OBDII plug. The place you do the tuning is this round diagnostic plug in the engine compartment. Because when tuning these you don't have access the control unit itself. I'n not exactly sure where you can found the ECU. In e39, e38 z3 or which other cars have these control units. In e36 cars this control unit can be found in the passenger side from here. Then for example I have one unit from 7/95 And in this there isn't any "Index xx" marking and it can't be flashed. So these can be tuned in the way I'm going to show. In the units that have flash chip, there is "Index" something after the Siemens part number. From the outside I have found that you could check that from looking at this label. If I remember correctly the flash chip has come inside these after 9/95 so after that the units are ok. So you have to buy newer unit is yours is like that and you want to tune it. At least the early Euro models from -95 don't have flash chip inside them. You also might want to keep on mind that all of these ms41 units can't be flashed in the way I'm going to show you. But the different software versions are compatible between all of these. For example they may lack support for downstream lambda probes. But the euro units for example can be missing few features included in the US ms41.1 and ms41.2 units. These all are basically the same control units which differ in the software part. And then there is ms41.2 which can be found from s52 engine. Here you can see Euro model ms41 which is called ms41.0 There is also ms41.1 which can be found at least in US m52 engines. Which is just stroked m52 with more aggressive cams. And also from s52 engine in US m3 models. You can find these Siemens ms41 engine control units from BMW m52 engines. This time we are going to look into teh Siemens ms41 ECU tuning basics.
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