360 Modena, Leonardo can't access LH motronic.

You likely have the three wire connector disconnected in the harness just next to the OBD2 connector. This connector is needed when you are trying to access both Motronics at the same time usually for a cycle test and it was likely left undone.

 

Yes, What windsock said.

 

Correct.

For reference, that's plug 2E/3E in the wiring diagrams. One side is grey/blue, the other is grey/blue and black. The single blue/grey wire goes to a splice which connects the Left Motronic ECU, the F1 TCU and the OBD2 port. The black wire is an earth and the grey/blue wire on the black wire side goes to the RH Motronic ECU.

Image Unavailable, Please Login

Looks like it's already connected.

 

Strange (especially since the car is running well).

If you have an ohmmeter and a long bit of wire, you might want to do a wiring check between the OBD2 port and the LH ECU.

i.e. pin 7 on the OBD port to pin 53 on the LH ECU connector.

Image Unavailable, Please Login

 

Using a long piece of wire may be slightly better than using this chassis earth method (shown below):

Image Unavailable, Please Login

With the long wire method, you don't have to worry about poor chassis earths affecting your measurements. Your meter should tell you the resistance of the 5 foot? piece of wire.

Image Unavailable, Please Login

I guess 5 or 6 feet should be fine. Just feed the wire through the driver's window.

 

You have a coupe, so you if we are talking about the LH ECU, you need the "inboard" connector "26L".

Image Unavailable, Please Login

It could be the bottom receptacle in your photo (but I can't be sure). However, you need to do the wiring checks on the plug on your engine wiring harness. Of course, you should inspect the pins on the ECU for damage/contamination.

Can you see any pin numbers marked on the plug (embossed into the plastic)?

 

Correct!

 

ah... a bent 53 pin. Good find. I looked at your photo and I missed the bent pin at first glance.

Note that my graphics show the female side of the connector.

Image Unavailable, Please Login

This certainly explains why you couldn't access your LH ECU with your Leonardo. Looks like a win for the mahlerfree/Qavion team (assuming that the pin can be un-bent)

Was it on the plug towards the right side of the ECU?

 

I mean, did I give you the right plug location? Was it the plug on the right side of the ECU when viewed from the rear of the car (as shown in the diagram).

Image Unavailable, Please Login

Glad you were able to unbend the pin. I would have used a female contact (socket) rather than small screwdrivers to unbend the pin, but it sounds like you had success. It wouldn't be easy to re-pin if the pin broke.