Disco 3 non start , help

Hi , I’m in desperate need of help . It’s driving me nuts , it all started with the hazard lights flashing for no reason , I locked and unlocked it and they stopped . Next day went to start it and it started then stopped straight away , it then cranked once then stopped , if I recycled the key it would crank once again , I fitted a new battery , it now cranks over but won’t start , if I do a hard reset ( put the pos and neg leads together) I can get it to start as long as I feather the throttle. Once it cuts out I can’t start it again until I do a reset again.

so I plugged in the scanner and it comes up with with

I have checked the fuses and main relay , all seem to be ok, I checked the ignition supply to the ecm and the perminate live , I am also getting the live’s when the relay activates to the ecm .
one thing I did notice on live data is that the ecm is saying 0 voltage ????
I suspect the ecu not giving the earth to trigger the main relay to supply the live feeds ,

what am I missing ? Where does the ecu get the reading for the voltage ?

any suggestions will be greatly received

thanks darren[GALLERY=][/GALLERY]

Any water in the car/under mats etc, just thinking weather been pretty shti.
Physically checked all fuses?
Swappped the relays around, do all the relays click when their function is activated?
Big black bit by bat pos terminal is a fuse, iirc there is also one down by the gearbox somewhere.
Engine earth straps also fail, one is apparently hard to see underneath somewhere!

Is there a back story, ie engine work etc?

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