1098ray
Active member
maybe the wiring is damaged somewhere to have caused this but again myself and the mechanic have stripped back all the wiring and inspected all of it for a fault/damage and found nothing.
2011 multistrada 1200s sport injector problem
- Thread starter 1098ray
- Start date
I was wrong, @Nelly ‘s right 
re the injector wiring.
If it were mine, before assuming the ecu has been damaged I would go back to basics. Is there a spark there? Is there fuel there? In post #24 you say it’s the lack of spark that’s the problem and that the injectors are definitely firing.
Swap the spark plugs from front to rear and see if the issue moves with them, if it does then it’s the spark plug that’s at fault.
If the issue doesn’t move, ie stays on the same cylinder, then return the spark plugs to where they were (don’t want too many things moved at the same time) and swap over the HT leads (from the coil to the spark plug) from the front to the rear cylinders. Does the problem move cylinders too? If not, replace the HT leads as they were and swap over the coils.
In this way you’re checking if the problem moves with a component to identify the component at fault.
Alternatively, I would have thought an authorised Ducati service engineer (such as Nelly) would be able to tell exactly where the issue is from the diagnostics.
re the injector wiring.If it were mine, before assuming the ecu has been damaged I would go back to basics. Is there a spark there? Is there fuel there? In post #24 you say it’s the lack of spark that’s the problem and that the injectors are definitely firing.
Swap the spark plugs from front to rear and see if the issue moves with them, if it does then it’s the spark plug that’s at fault.
If the issue doesn’t move, ie stays on the same cylinder, then return the spark plugs to where they were (don’t want too many things moved at the same time) and swap over the HT leads (from the coil to the spark plug) from the front to the rear cylinders. Does the problem move cylinders too? If not, replace the HT leads as they were and swap over the coils.
In this way you’re checking if the problem moves with a component to identify the component at fault.
Alternatively, I would have thought an authorised Ducati service engineer (such as Nelly) would be able to tell exactly where the issue is from the diagnostics.
1098ray
Active member
its not the ht lead,because it works ok on the rear cylinder
1098ray
Active member
everthing has been swapped many times from front to rear and the front always fails ,never the rear. the ht leads must be ok because they both work ok on the rear. the diagnostics does not show where the problem is according to ducati glasgowI was wrong, @Nelly ‘s right
If it were mine, before assuming the ecu has been damaged I would go back to basics. Is there a spark there? Is there fuel there? In post #24 you say it’s the lack of spark that’s the problem and that the injectors are definitely firing.
Swap the spark plugs from front to rear and see if the issue moves with them, if it does then it’s the spark plug that’s at fault.
If the issue doesn’t move, ie stays on the same cylinder, then return the spark plugs to where they were (don’t want too many things moved at the same time) and swap over the HT leads (from the coil to the spark plug) from the front to the rear cylinders. Does the problem move cylinders too? If not, replace the HT leads as they were and swap over the coils.
In this way you’re checking if the problem moves with a component to identify the component at fault.
Alternatively, I would have thought an authorised Ducati service engineer (such as Nelly) would be able to tell exactly where the issue is from the diagnostics.
1098ray
Active member
hopefully someone with electrical knowledge can tell us
1098ray
Active member
there is only one earth for both at that part of the loom
This will be solid state switching, with a relatively low "on" duty cycle.
Injectors are NOT designed to be "on" for any continuous period.
1098ray
Active member
just got my multi back from the mechanic. i have an ecu coming soon in the post and the first thing i am going to do is change it just incase the original one has a fault. then try a loom. do i need to disconnect the bikes battery or is it just a case of unplugging the box and then connect the new one.
I’d disconnect the earth terminal off the battery just to be on the safe side but it should be fine to just unplug and plug back in.
1098ray
Active member
ok,thanks
I'd definately disconnect the battery before touching the ECU
1098ray
Active member
better safe than sorry
1098ray
Active member
very true. but you need a bike firing on all cylinders first.
1098ray
Active member
i am trying to dodge fitting another loom but its getting closer. before i do that i think the only other fault it could be is the electrical connector for the injector on the front cylinder. if i cut off the connector from the used loom i have bought and swap it with the existing one, will i weaken the signal from ecu to injector
No.
I’ve not reread the thread but it’s occurred to me perhaps the injector itself is faulty. Have you tried swapping the injector units from front to rear and seeing if the issue moves with them?
1098ray
Active member
they have been swapped 2 or 3 times and a used one was bought as well. i think my next plan while i have the airbox off again will be to swap them one more time and change the electric connector for the injector.
Most frustrating 
1098ray
Active member
no offence paul but can i have a second opinion from someone,before i start cutting the electrical connectors of both looms. ie,losing the strength of signal between the injector and the ecu.
I remember, not bike related, watching one of those wheeler dealers and on a range rover.
The injectors appeared to have one or two not dispersing properly. They swapped a good firing injector over to the cable that had the bad firing injector and that started to disperse irregulary too. Turned out the wiring loom itself to those two individual injectors were at fault with a possible break in the wire and the resolution was to replace the smaller loom between the main loom and the injector.
The injectors appeared to have one or two not dispersing properly. They swapped a good firing injector over to the cable that had the bad firing injector and that started to disperse irregulary too. Turned out the wiring loom itself to those two individual injectors were at fault with a possible break in the wire and the resolution was to replace the smaller loom between the main loom and the injector.
No offence taken. @AirCon is perhaps the best placed to advise but he’s on holiday at present.
I think you’re referring to attenuation which happens over long distances of cables. The injectors just need 9v to open (hence the hack to test them with a 9v battery) so you’d have to add some fairly serious resistance in such a short circuit to get the voltage below that.
1098ray
Active member
its got to be the wiring or connector thats at fault now. if the rear was at fault the bike would be f---ed, and not run at all. just had it out again to double check with the dtc switched off and the power delivery is great after 4000 rpm.
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I'd have thought he'd of been able to sort it for you, loom the last thing then
bad earth could cause the issue but on the loom good luck with finding it 