Bit of an issue with dual cam KA

By this you mean the chassis harness right? Sohc engine harness would not connect to a dohc.

Your problem is a ground!!! look on the back corner of the engine on the exhaust side. there should be 2 grounds there one that goes to the fire wall(not to important) and one that goes to the engine harness. If this is not grounded injectors will not fire.