Cheers once again Dave I agree with you I am confident that the fuel injection relay and the radio suppression relay are sound as the injectors have power and the fuel pumps run, Luckily had a spare ECU in stock so tried this on the car and it has made no difference the car still wont start unless i bridge negative onto the grey injector wiring.
Out of curiosity there are two ECU's in the footwell the silver one that is low down under the bonnet release and a black Bosch one higher up. I only had a spare silver one in stock so have not been able to substitute this one
That aside all of this is pointing to a wiring fault and the only option appears to pin each wire out one at a time. I have managed to find a Volvo service manual with all the test details for the 2.4 lh jetronic its for the non turbo engine but i am hoping it will lead me to the cause, I intend to start with the ECU earths and take it from there.
Its going to be later in the week now though as unfortunately I have to travel.
At least i know now that if the injectors see negative the car will run so thats progress and rules out a heap of other components
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