Technical Ducato injector voltage?

[WayneNZ]

HI All.
I am having trouble starting my Ducato 2.2 2022 9 sp auto camper. It has had water drowning. I've replaced BCM and airbag system.
The engine turns over ok but tries very lightly to fire on one cylinder. No fault codes present.
Rail pressure ok. Crank speed ok. I checked fuel injector supply voltage at 4.93v which i feel is too low to fire the injectors. My ECU may be cooked. Supply to the ecu seems good.
I would think the injector voltage would be at least 12volt to fire the injector.
Any idea on what voltage should be?
Cheers.

 

[bugsymike]

HI All.
I am having trouble starting my Ducato 2.2 2022 9 sp auto camper. It has had water drowning. I've replaced BCM and airbag system.
The engine turns over ok but tries very lightly to fire on one cylinder. No fault codes present.
Rail pressure ok. Crank speed ok. I checked fuel injector supply voltage at 4.93v which i feel is too low to fire the injectors. My ECU may be cooked. Supply to the ecu seems good.
I would think the injector voltage would be at least 12volt to fire the injector.
Any idea on what voltage should be?
Cheers.

I have only worked on older versions, but I suspect models as new as your would use "Piezo type" diesel injectors.
" The piezo injectors are operated by up to 200 volts, 15 amps."
This may seem strange on a 12 volt battery system , but there are capacitors and other electronics within the modern ECUs that deal with that side.
Older injectors such as Bosch on 2005 models etc. used a solenoid to activate the injector nozzle opening and when I was testing them using an old "pop off" type injector tester I could build up the pressure and then use my 24 volt diesel jump start pack to activate the solenoid by splashing the wire across which opened the injector and gave the spray pattern as a simple test even though I understand the correct voltage for them was approaching 90Volts.
However I would strongly advise you not to try this on expensive injectors like yours.
If you can get the make and numbers from one of your injectors I am sure you will be able to confirm the operating voltage etc.
Just another minor point, I trust your engine didn't ingest water!!!
I had a Ford that had flood damage, initially I was told it only got to the ECU in the wheel arch, however in the end it had bent a con rod and the story that it had been only a short time before was disproved on inspecting the injectors as they all had corroded nozzles due to the water on them for months.!!!

 

[Communicator]

The supply to the injectors is a short pulse. I doubt that you will be able to measure the actual voltage with a multimeter. You would need to use an oscilloscope to observe the waveform with any degree of accuracy.
I do not have any recent info on injector voltages, and the attached inormation is an extract from eLearn for the x244 model ,hence over 20 years old.

 

[bugsymike]

The supply to the injectors is a short pulse. I doubt that you will be able to measure the actual voltage with a multimeter. You would need to use an oscilloscope to observe the waveform with any degree of accuracy.
I do not have any recent info on injector voltages, and the attached inormation is an extract from eLearn for the x244 model ,hence over 20 years old.

Yes that is the solenoid type, when they advanced to "pizeo" then beyond my primitive testing methods.
Although I believe for just over £100 odd you can get a chinese tool that simulates the ECU actions.
The other reason was with old eyes it was hard enough rebuilding the more simple Bosch Solenoid ones, so I gave up even trying with later types.
I see on your pdf @Communicator it mentions 50 volt and on some I understood even higher, however my very simple test worked on many though never held power connection on, just "splashed it across terminals".
This one comes with pump as well.

 

[WayneNZ]

The supply to the injectors is a short pulse. I doubt that you will be able to measure the actual voltage with a multimeter. You would need to use an oscilloscope to observe the waveform with any degree of accuracy.
I do not have any recent info on injector voltages, and the attached inormation is an extract from eLearn for the x244 model ,hence over 20 years old.

Thanks for that great info. I was unaware of the piezo system. I think my problem may be the ECU. I will see if any locals (New Zealand) can test piezo pulse. I did measure with digi voltmeter but as advised this may not work as pulse is too quick. Attached photo of injector. I can't see anything meaningful in the writing on the injector.
cheers

 

[bugsymike]

Thanks for that great info. I was unaware of the piezo system. I think my problem may be the ECU. I will see if any locals (New Zealand) can test piezo pulse. I did measure with digi voltmeter but as advised this may not work as pulse is too quick. Attached photo of injector. I can't see anything meaningful in the writing on the injector.
cheers

So it appears to be a Bosch Injector, but sorry I don't know if it is Piezo or not.
I suspect it is piezo due to the end of serieal number.:-The rapidly switched CRI3 piezo injector injects

Fiat Ducato 2.2 MultiJet 2021 Onwards New Bosch Diesel Injector 044511113R​

Part Number Cross References

New/ Replacement Number	OE/ Reconditioned Number	Manufacturer Exchange Number	Cross Reference Number(s)
044511113R			46350501 0046350501 K0046350501

044511113R Fiat Applications

Applications	Year	Engine Size	Power KW	BHP	Cylinders	Engine Codes
Ducato 120 2.2 MultiJet	20212 Onwards	2.2	88	118.008	4	46349131
Ducato 140 2.2 MultiJet	20212 Onwards	2.2	103	138.123	4	46349131, 4H034HB
Ducato 160 2.2 MultiJet	20212 Onwards	2.2	118	158.238	4	46348913
Ducato 180 2.2 MultiJet	20212 Onwards	2.2	132	177.012	4	46348913

 

[theoneandonly]

This is for my 2017 2.3 twin egr model

Injector Waveform Picoscope | FIAT Ducato

On a previous thread someone mentioned the use of an occiloscope in Auto diagnostics. Well i have a ducato and MES tells me the injector variances are greater than the FIAT spec of +-2 but under what conditions. So Ive watched a lot of you tube and bought a scope and an amp clamp probe. The...

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