Technical Help my Fiat 500 Abarth won't start

[koalar]

Thinking out loud

Sparks plugs are firing HT is okay

Spark plugs are firing ECU getting signal from crank sensor

Fuel rail is pressuring pump is okay

Injectors aren’t switching

My next move would be to check the injector are getting power from the relay

Everything is working except the injectors

Would it not be sensible to measure the voltage going to each injector before going any further

Should have battery voltage

 

[suptempo]

Everything is working except the injectors

Would it not be sensible to measure the voltage going to each injector before going any further

Should have battery voltage

Yes i will definitely do that. I need to get the multimeter back from a friend.
To measure the voltage I just turn the ignition on and measure the resistance in ohms right?
Or do i need to crank the engine and measure it?

Thanks!

 

[koalar]

Yes i will definitely do that. I need to get the multimeter back from a friend.
To measure the voltage I just turn the ignition on and measure the resistance in ohms right?
Or do i need to crank the engine and measure it?

Thanks!

No volts

Should be battery voltage between between earth and either injector cable

Ignition should be on

 

[John202020]

Everything is working except the injectors

Would it not be sensible to measure the voltage going to each injector before going any further

Should have battery voltage

Are the injectors switched on the negative side? IE constant live feed ? Oscilloscope could be useful to see the signal?
Lets assume there's no signal, what could cause this when you have a spark
Further back misfiring preceded loss of power which could also be loss of injection rather than spark?

 

[koalar]

Are the injectors switched on the negative side? IE constant live feed ? Oscilloscope could be useful to see the signal?
Lets assume there's no signal, what could cause this when you have a spark

Yes negative switched

First step is to check the supply

The injector harness has failed in the past

 

[koalar]

Depends what tools you have available to you

I would activate the injector manually via software

If that failed confirm the supply and continuity to ECU as per video I posted above

 

[MrMagoo]

What are the OBD codes or stored OBD codes?
My nephew's MiTo QV failed to start because of a faulty alternator.
Have you tried jump starting it?