Corsa c - Corsa C won't start! Saying injection fault! - emmasid

Right put a new engine in my corsa c 2001 reg 1.0, when I've gone to start it its trying but not starting, I've not changed the ecu kept that from old engine, if I pour petrol into the carb (not sure that's correct wording) it starts then juders runs out of petrol, took it to the garage for diagnostics they say coming back with injector fault so took my old injectors out other engine and put them in still no joy, garage said could be ecu! Any ideas? I'm getting desperate!
Corsa c - Corsa C won't start! Saying injection fault! - emmasid
Someone please! Got fault codes p0201 p0202 p0203
I've changed the injectors over today and still get same codes!!