G60 won't start No power to fuel rail

[Joe-G60 0]

Hi all, my corrado has being acting up on me this while sometimes it will start and other times it wont, i have the whole ignition system changed, and new injector harness and a new fuel pump relay and i have also tryed out another ecu but still havnt solved my problem, today i again checked the voltage at the fuel rail this time i am getting very little or no voltage.

 

Can anyone please help me

 

Thanks,

Joe

[andycowuk 0]

Are you taking your measurement at the injector plug or the plug that attaches the 4to1 to the main harness; what if you go further back than that - do you get a voltage at the ECU pin?.

 

What did you get when you measured it beforehand - The more I think about it, I'm not sure what voltage I'd expect on the fuel rail with the engine not running - obviuosly there should be no fuel delivered, so it should be next to nothing....

[Album56 0]

I think there should be 12v from the live to a good earth, ie. measured between the live of the fuel rail & the negative of the battery. The ECU switches the earth to operate the injectors. Have you tried changing the ECU relay yet?

[andycowuk 0]

I think there should be 12v from the live to a good earth, ie. measured between the live of the fuel rail & the negative of the battery. The ECU switches the earth to operate the injectors. Have you tried changing the ECU relay yet?

 

Attached diag shows fuel pump relay controls 12v supply to injectors, so as Album 56 says the ecu switches the earth rather than the supply. you've already changed the fuel pump relay, but I think it may be worth putting the old one back in to see... you could also test the old one by connecting 12v across the coil then testing for continuity on the switch.

 

You need to establish how far down the pipe 12v is getting... those wires on the fuel rail have always looked awful on the corrado's i've had, but they have all worked!