need help with wiring layout for Magneti Marelli IAW ecu

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need help with wiring layout for Magneti Marelli IAW ecu

Robbedoes

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Hi Guys,

I am working on a patch harness for a Magneti Marelli IAW 16 ECU to MS2 conversion for a MV Agusta (Ducati / Fiat l Lancia) system.

I got into some uncertainties about the power relais, and when googling i keep ending up on more Fiat forums than on MV Agusta or microsquirt forums. Probably because Fiat sold a lot of cars with the Magneti Marelli IAW ecu's. I was intending to post the question on the forum in the wiring section but the sections are model specific so i am not sure where to post it..

The problem:
The sensors and accessories are pretty straight forward on the Magneti Marelli IAW ecu but can't figure out the ECU power and relays control. The IAW ecu uses 4x 12V power lines (1 ecu on off switch, 2 relay controls and 1 ecu main power) while the MS2 only has an ignition switched on off line and 1 relay control wire so i do not know how to reroute the additional wire.
MV Agusta uses the following, possibly identical to Fiat:
- a main relay controlled by the safety switch (kill switch) / ignition key with a low power line to ECU. (middle relay in the diagram)
- a fuel relay (power relay) controlled by the ECU for the fuel pump,coils and injectors (equivalent to MS2) (bottom relay in the diagram)
- a main ecu power relay (Latch relay) for a high power line to the ECU also controlled by the ECU (top relay in the diagram)

robbedoes-albums-stuff-picture2513-iaw600x600.png


The MV Agusta relay board is a single PCB I wish to keep stock.

I considered:
- GND Switching the Latch relay (OEM pin 4) with an unused MS I/O (not sure if possible).
-Bridging the Latch relay control wire with the Fuel relay control wire and doing something with the high power wires (not sure how).
-Keep the Latch relay unused but I doubt that the ignition switch controlled power line is up to the MS power demand and am unsure about unforeseen effects on the system.

Suggestions are very welcome.
 
Last edited:
Good god guy's the usability of this forum is a disaster. How do I edit my first post?
 
Hi mates,
I´m looking for the wiring of marelli ecu from MV agusta. Can anyone help me with it?
thanks in advance ;)
 

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