Hi Chris... No, I haven't tried another switch, but will try taking the kill switch out of the equation by either putting a direct supply on the ECU ...or jumping the switch.
Afraid it is a process of elimination. I can help out with the ECU. Coil driver failure can happen in the ECU. I can loan you an ECU to test if it is that component causing the problems. The MTS1000 used two versions of the IAW5AM ECU (HW103 or HW610). You will need to identify which is fitted to your bike. Easiest way would be to connect JPDiag to your bike (I would suggest getting the leads anyway - https://www.lonelec.co.uk/Motorbike...ware/Guzzidiag-Melcodiag-3pin-Interface-Cable). Or, remove the ECU and carefully peel back the white labels to reveal the Magneti Marelli ones below. I need to know if it is HW103 or HW610.
Id think its most likely something like an earth, a switch or a broken wire than two faulty coils esp if you think its also cutting fuel.
I have already tried an earth strap from the ECU body to the negative battery post. I am going to try putting a supply directly on the ECU, which will take the kill and sidestand switches out of the equation.... then take it for a ride with the fuel pump supply metered. That should cross a few possibilities off the list ☺
Im no expert but would you need the supply the feed the fuel system and injection and not just the ecu.
From looking at the wiring diagram, it seems... The injectors and coils are supplied (triggered) from the ECU. The ECU also earths the fuel pump relay.
If they are only triggered by the ecu? Are they also supplied by it ? If not you need to eliminate failure of the supply. As i say im no expert. Also you say the ecu earths the fuel pump but where is the positive feed fed from.
the ecu supplies an earth to the fuel pump/injector relay which gives +12v the fuel pump and injectors, the fuel pump itself has a permanent earth. the same relay? cant mind, gives the injectors and coils? a permanent 12v+ the ECU switches the earth on/off signal for the coils and injectors. (ignition timing and fueling) this is more for me btw,a wee refresher, its been near 10years since i have done a course.
The ECU provides an earth trigger. Better to check the relay that actually supplies the volts to the injector/coils/pump (all from one relay).
My Multistrada is now running like a dream ☺ I thought that I would ride it for a few hundred miles before posting... just in case Every test was pointing towards an ECU fault, so Chris W very kindly lent me one to try (Thanks mate)... but the problem persisted. After much head scratching, and almost by chance... I found that the Sidestand circuit was only allowing the ECU to see an earth through the body of the switch itself, not through the fused circuit in the loom. It was a good enough earth for the bike to run, but once warmed up the ECU was 'freaking out' and cutting power to the coils under load. A real head-scratcher ☺
Good to hear that it's now running well. I'm a bit puzzled about the ECU earthing through the side stand switch though. The switch hasn't got an earth connection, nor does it's body connect to earth. It does supply 12V to the ECU from the 3A fuse though. A poor contact in the switch would limit the available current and probably produce the symptoms you experienced. Whatever, at least you know the switch was the culprit.
According to my wiring diagram, the switch is in the negative side of the circuit... ECU - Switch - 3amp Fuse - Earth. I agree that the switch 'shouldn't' be earthed to the body, as that would seem to make the fused circuit redundant. The fault was in the fused circuit, with the (albeit poor) earth through the switch body allowing the bike to run. I think that the bike had the wrong switch fitted, as it has three connections... One of which is a green that was providing an earth. I am going to use the bike without the switch, until I get a chance to put a meter on the 'correct' one. ☺
You are right! I hadn't followed the diagram beyond the fuse and didn't see that it goes to earth. It is pretty unusual to have a fuse in the earth side of a circuit.
