Does the ECU work in a car that was a known runner?

SW = Black
RT = Red
GE = Yellow
GN = Green

Check with a multimeter with resistance (ohms) preferably with a buzzer (buzzer will buzz if there is good continuety, if it doesn't buzz then ou know you have a problem). You need to check that the 2 signal wires are continuous and have no resistance in them. Also that the earth buzzes out for the module and the 2 wires to the ignition coil. Make sure you have 12v on the black yellow, the green wire should pulse (with a test lamp with everything connected, cranking over) to trigger a spark.