Hi all!
I’m (hopefully) going to put a 3SZ into my L701 (Cuore), but I ran into a problem.
To make sure everyone knows what I mean:
SIRION 2 = M3
YRV = M2
SIRION 1 = M1
So, I wanted to use the harness from an M2 or M1, because those are pretty much plug and play in an L7. However, the ECU plugs from the M3 are not the same as the ones from an M2. Therefore, the M2 harness will not fit on the M3 ECU. I made an Excel-sheet to compare all the pinouts from both ECU pinouts (M3 vs M2).
The biggest problem is that the M3 has a lot more pins than the M2. Not all of them are in use, but to give you an example: the M3 has CAN, and 4 ICMB (ion current combustion signal) signals, whereas the M2 has no CAN, and just 1 ICMB signal. There are a few more of these pins, but I think you get the point. I know I can probably use the M2 harness, use the M3 ECU plugs, and make sure all the pins are in the correct place, but I’m worried the engine won’t start, doesn’t run properly, or gives me a dashboard full of Christmas lights. I’ll post a few pictures below to clarify a few things!
YRV ECU pinout
SIRION 2 ECU pinout
Going back to the ICMB signal I was talking about earlier: looking at the M3 pinout, you can see that pins 48 - 51 are all ICMB, while the the M2 has only one ICMB signal (pin 14).
I’ve thought about using the engine-harness from the M3, and the interior-harness from the M2, which makes sense in the first place. However, the engine-harness has to connect to a fusebox, and guess what? The M2 and M3 are not the same 
.
I know @Speedpower and @thefiztec have done it before, but I have no idea how they’ve managed to do that with the M3 ECU.
Please let me know if you need more info to help me 
Thanks!
