V4s won't start - brand new

Ducati Forum

Help Support Ducati Forum:

Ducati dealer wouldn't do that, I was very disappointed with ducati miami service, they had a bike for a week, didn't check anything.
Only thing they actually did infront of me, they updated software on ecu, and here is the question, would the update even go through if ecu is bad?

As far as I understand you can't just reply ecu... bbs yes, ecu has to be swapped along with dash and ignition chamber, if that's so , that's gonna be painful

Are there any sensor which will prevent ecu from activating injectors? I was told bosch lean angle service might cause it
 
Could be something really simple, as simple as the throttle rheostat not being in the right position as I discovered when I played with it one one day. Surely does appear like someone tried to bypass security. Id very carefully go over it bit by bit, starting with the handle bar switches as strange as that may sound.
 
I would agree with you on that, maybe it's me being over optimistic, but it seems like it is something stupidly simple lying on the service
 
To me sounds like a immobiliser issue, since it will crank but injectors won't fire.
Just for ..... and giggles buy a cheap chinese key and have it cut to the bike.
Since its not programmed and cheap ...... key will ask for your e lock code and then try start it.

Ive read somewhere on here, sometimes throttle spacers will hold open the throttle and not allow it to start.

Vbeinars said:
Ducati dealer wouldn't do that, I was very disappointed with ducati miami service, they had a bike for a week, didn't check anything.
Click to expand...

I had the same with a r1 that would drop a cylinder once warmed up, five star Yamaha who are highly regarded here had her for two days and said it was the thermo wax assembly on the throttle bodies. $800 later just to diagnose a wrong part

Sounded like .... to me because it has a bar across all cylinders in the throttle body. Anyway I phoned a wrecker who over the phone in 5mins said its your injector, replaced and all good.
 
Halo2 said:
To me sounds like a immobiliser issue, since it will crank but injectors won't fire.
Just for ..... and giggles buy a cheap chinese key and have it cut to the bike.
Since its not programmed and cheap ...... key will ask for your e lock code and then try start it.

Ive read somewhere on here, sometimes throttle spacers will hold open the throttle and not allow it to start.



I had the same with a r1 that would drop a cylinder once warmed up, five star Yamaha who are highly regarded here had her for two days and said it was the thermo wax assembly on the throttle bodies. $800 later just to diagnose a wrong part

Sounded like .... to me because it has a bar across all cylinders in the throttle body. Anyway I phoned a wrecker who over the phone in 5mins said its your injector, replaced and all good.
Click to expand...

^^ This. I also like the lean angle sensor being shorted out… open? Service manual will give you the ohm reading for that switch.


Sent from my iPhone using Tapatalk
 
There no throttle spacers installed, I've checked when disassemble controls on both handle bars to check for dust, corrosion, broken parts etc. Since when I recieved the bike it didn't respond to buttons. First shop where it was told me right away electrical wiring is ...... , ended up checking myself, harness wasn't connected to the controls, some wires were broken, few wires came out of connectors.
 

Attachments

  • 20210627_104937.jpg
    20210627_104937.jpg
    756.3 KB
CanyonCarver said:
^^ This. I also like the lean angle sensor being shorted out… open? Service manual will give you the ohm reading for that switch.


Sent from my iPhone using Tapatalk
Click to expand...
Downloaded service manual , can't find any mention regarding lean angel sensor, btw, I see two of them, right?
 
Did you verify the fuel pump is actually working by simply taking the main fuel line off the injectors and seeing that when the motor is cranking, fuel is being sent to the injectors? If so you’ll see it squirt out.
 
DCPanni said:
Did you verify the fuel pump is actually working by simply taking the main fuel line off the injectors and seeing that when the motor is cranking, fuel is being sent to the injectors? If so you’ll see it squirt out.
Click to expand...
It is definitely working, you hear it prime, and you can also feel gas flowing through the hoses to injectors/fuel regulator. I didnt not check pressure myself though, because ducati miami told me they did and I didn't have a tool... Bought it yesterday, gonna check fuel pressure shortly, just to calm myself down, since I have no faith in work done by previous shops.
Also, what about fuel regulator? How do you check that? I don't see any wire going to it, it doesn't need one?
 
You could be powering up the ECU which starts with fuel prime, however, once the ECU is fully loaded and connected to all the sensors maybe then it is seeing the tip over signal? That being said I have an Aim Solo 2 DL that I use on track and it can see the kickstand, tip over sensor etc. My point is that if my Aim can see that sensor and it’s signal then the dealer can see it for sure.


Sent from my iPhone using Tapatalk
 
On most vehicles there is a fuel pump fuse (big) and a smaller fuses for FUEL INJ, ECU, etc. I would check the smaller fuses, remove the fuel inj one , figure out which slot of the two is hot (+) and check for grounds on the other. I’d check across to the frame…

If the hot side going to the injectors is grounded it should’ve blown the fuse However, if the ground (-) off the injector circuit (not the fuse) is open it would explain a great deal. I’m leaning towards an open ground or something that isn’t supposed to be grounded.


Sent from my iPhone using Tapatalk
 
Vbeinars said:
There no throttle spacers installed, I've checked when disassemble controls on both handle bars to check for dust, corrosion, broken parts etc. Since when I recieved the bike it didn't respond to buttons. First shop where it was told me right away electrical wiring is ...... , ended up checking myself, harness wasn't connected to the controls, some wires were broken, few wires came out of connectors.
Click to expand...

bad wiring going into a connector will be tough to track down. I had a massive problem on a used boat I bought. The previous owner said it spent half its life at marine max with engine faults. I diagnosed it down to a bad connection at the main harness. Pulled all the pins, ordered a new connector and worked perfectly thereafter until I sold it.

Dealer techs only know how to follow checklists and flow charts. Most have much less experience than your realize.


Sent from my iPhone using Tapatalk
 
I hear you, however when dealer has computer connected to ecu, they didn't found any errors, and they also told me their computer will not detect any faulty sensors, which I find absurd.
 
Vbeinars said:
I hear you, however when dealer has computer connected to ecu, they didn't found any errors, and they also told me their computer will not detect any faulty sensors, which I find absurd.
Click to expand...

That’s the problem with sensors. They output a signal of ON or OFF or a value between a min and max. Unless the min max type sensor shorts or goes open, the computer cannot tell its bad even though it’s generating a bad signal.

Injectors work off pulse width signals, duration of the pulse width is converted into opening in milliseconds. You need special equipment to read what pulse widths are actually making it out of the ECU harness to th injector connector. The fact that there is spark tells me the computer can see the crank and cam positions if they are variable.

Will it run with staring fluid?


Sent from my iPhone using Tapatalk
 
CanyonCarver said:
That’s the problem with sensors. They output a signal of ON or OFF or a value between a min and max. Unless the min max type sensor shorts or goes open, the computer cannot tell its bad even though it’s generating a bad signal.

Injectors work off pulse width signals, duration of the pulse width is converted into opening in milliseconds. You need special equipment to read what pulse widths are actually making it out of the ECU harness to th injector connector. The fact that there is spark tells me the computer can see the crank and cam positions if they are variable.

Will it run with staring fluid?


Sent from my iPhone using Tapatalk
Click to expand...
When I spray starting fluid into throttle bodies, which is kinda difficult since they are closed, I would describe it like bike coughing few times, but not firing up, you can hear combustion happening
 
Do you have the Lonelac cables from UK with the ELM327 module? There is mototool for Android and numerous programs like jpdiag that you can download. Those will allow you to run tests like fuel pump, throttle bodies etc.


Sent from my iPhone using Tapatalk
 

jpdiag

jpl250rs diag diagnostic, ducati guzzi, morini ,piaggo , mp3 , ducatidiag
jpdiag.akress.com jpdiag.akress.com

JPDiag and Melcodiag

Lonelec

Lonelec
www.lonelec.co.uk www.lonelec.co.uk

Need to know whether you have 3 pin or four. The adaptor for 3 pin is different than 4 pin one as well.

Email Lonelac and ask what you need to run melcodiag

Contact Us

www.lonelec.co.uk www.lonelec.co.uk


Sent from my iPhone using Tapatalk
 
CanyonCarver said:
Do you have the Lonelac cables from UK with the ELM327 module? There is mototool for Android and numerous programs like jpdiag that you can download. Those will allow you to run tests like fuel pump, throttle bodies etc.


Sent from my iPhone using Tapatalk
Click to expand...
I have elm327 OBDII connector, thing Is jpdiag doesn't read with it, unless it has a USB cord, mine are Bluetooth and WiFi one's. I can download software recommended by the connector manufacturer, but will it actually work with ducati bike? since it us mostly made for cars

I ordered whats recommended by jpdiag but it will only arrive Tuesday
 
This an absolute horror show so might be best to throw the harness in the trash and get a used known working one. I would recommend building up a bench harness setup so you can run the bike with the tank off the bike little easier to diagnose stuff.
 

Similar threads

S
Ducati Panigale V4s WONT START
2
Replies
26
Views
1K
synckkid
synckkid
V
Problems and Performance Over Engine Life - v4r and v4s
2
Replies
26
Views
2K
SuperDomestique
SuperDomestique
M
Panigale V4S issue
Replies
2
Views
346
BP PanigaleV4S
BP PanigaleV4S
M
Panigale v4s please help!!!
2
Replies
30
Views
627
BP PanigaleV4S
BP PanigaleV4S
C
Cold Start-Up - bike seems to be trying to go into gear itself....?
Replies
8
Views
610
V4Syyc
V

Register CTA

Register on Ducati Forum! This sidebar will go away, and you will see fewer ads.

Recent Discussions

Back
Top