milo

Are there different shades of green for the V11 Sport from the factory . I recently bought a green tail section for mine to save painting my scuffed one and it turned out to be a different green. I remember years back seeing another green one that was a different shade of green but mine is the same green as the 1972 V7 whereas the tail section i bought is a more vivid lime green. Just curious if mine came from the factory with the same green it has now. IMG_8599.HEIC

Been away with work for a while so just got back to the Guzzi , i bench tested the injection relay and found it to be faulty so replaced with another new one and all ok with the voltage now, the relay was a brand new Bosch but not the first time i’ve fitted an electrical component out the box and it didn’t work. But the bike still won’t start. Going back to my original question from this post “ Is there a way to test the injectors or ECU signal? “ When the ignition is turned on there is 12V on the injection relay circuit for a second, the fuel pump turns on for a second then stops because its voltage feed is dropped to 3.5V by the ECU. So to test the voltage for the injectors there is 3.5V at the plug with ignition on and 12V intermittently when cranking. I took the injectors out and connected a 12V battery with a push button to test. Pushed the button for a second , nothing , pushed for two seconds, nothing , pushed for three seconds the solenoid clicks , again for three seconds it clicks then two seconds it clicks then one second it clicks then immediately , so on/off a few times and works fine. I filled the injector body with fuel put 3bar air pressure on it pushed the button and got a nice perfect spray pattern , did it a couple more times then repeated the same process with the other injector. Fitted the injectors , a couple of crank overs to prime then it fired up and went onto a nice steady idle, so works great now. So the fault was the injector solenoids had been sat for too long and they just needed a bit more than a quick flash of 12V to kick them of their seats again.

So the 3 wire bundle negative terminal i was looking at, one goes to ECU relay then diagnostic plug then the other two go direct to the ECU so basically without this negative on the ECU its turned off and i get 12V at the injector plug, things didn't really seem to add up but I read somewhere when looking for injector info that some systems only have +12V at the injector when cranking or running but looking at the Guzzi diagram it would appear that the coils, fuel pump and injectors should all have 12V when the relay closes. So i reconnected the ECU negative, cranked it over and i'm getting 10.2V at the Injector when cranking so i led myself astray chasing the low voltage fault. Next i looked at the injection relay and if moved around pulled out a bit i get 11.2V at the injector when cranking so almost there , i've got a spare relay base somewhere so i'll try fitting that next time.

Just to recap on my original post with more detail , before i attempted to start the bike I fitted a NEW ODYSSEY PC545 Battery , NEW PIERBURG - 7.21287.53.0 fuel pump , NEW set of Bosch relays , checked the BCM air filter that didn't have a spec of dust on it , emptied the tank and filled with new fuel , checked the plugs were sparking , checked that there was fuel pressure at the injectors which there was then i attempted to start the bike, cranks over perfect but won't start as there is no fuel getting injected. MartyNZ - Been there myself with the old 6V bikes forever cleaning the terminals but the V11 although not the best connectors are fairly tight and well sealed but not to say i haven't had the odd wiring issue in the past as with all Italian bikes, also the bike has always been kept in underground parking so not a hint of humidity or oxidation to be found on it , what i've disconnected so far has all been really clean connections . As there are quite a few leads connected to the battery i thought i'd start at the source to check for faults so i removed the 3 negative leads and reconnected one at a time and found with one of the leads disconnected i had a constant 12V at the injectors with ignition on, when i connect the third wire it drops again to 4.5V. The wire in question is a bundle of 3 one of which goes to the ECU relay then the other two not sure as yet (maybe ECU also) but need to do more tests to verify.

Found some info for fuel injection testing so started with the two pin feed wire and found the ECU to be putting out the signal but the constant feed voltage drops from 12.5 to 4.5V as soon as i turn on the ignition so looks like i'll be having another Guzzi electrical fault finding session. Seems strange as i last started it over three years ago with jump leads then removed the battery to use as a doorstop in my workshop so its been sat without a battery ever since, can't imagine what could have happened to the electrical system in the intervening period.

No , i don't have Guzzidiag , maybe i'll look at getting it if i cannot solve the problem.

The problem is no fuel is been injected into the throttle bodies so i initially thought maybe the ECU is at fault as it would seem unlikely that both injectors would fail. It could be the timing sensor not sending the signal to the ECU to activate the injectors but then you would think it wouldn't send the signal for a spark as well or could be a TPS error. Maybe there is some other component that would stop the fuel injection but i'm just not seeing it right now. It could be that the injectors are stuck after been stood for so long.

I loosened the pipe clip on the injector, fuel started seeping out then i pushed the pipe to one side and fuel squirted out across my workshop with some force and that was just residual pressure in the pipe without the pump running.

My 2000 V11 has been parked since August 2016, earlier this year i tried starting it with a new battery but found the fuel pump was broken so i bought a new Pierburg pump and a new set of relays which i have just fitted. Everything appears to be working, good fuel pressure, good spark and cranks over good but there is no fuel getting injected into the throttle bodies as both are bone dry. Looking at the wiring diagram the fuel injector gets positive power feed from the same relay as the fuel pump so i am thinking maybe ECU fault or the injectors are gummed up. Is there a way to test the injectors or ECU signal?