Hi

What engine does it have? 4G63, 4G93, 4G94?

I am afraid there is a bit more you need to do to find your way here.

Using your scope you need to check the voltage and current on all the injectors at the injector driver ECU. Pins 23,24,25,26

When you know which ones are that faulty ones you need to scope the injector driver ecu for four good seperate injector driver signals that originate from the engine ECU, pins 10,11,19,20.

If these are good check the lives and earths of the injector driver ECU. Live pins 21,12 Earths pins 13,22.

Without knowing more it is hard to make a sensible diagnosis.

Regards

Simon