camry 93 fuel injector control

hi
i have got camry 93 i was looking at diagram to check control i realized there are two control for four injectors . i know there are wast spark system.what about injectors it dosen"t make sense and not logical .how this two control work with four injectors.
thanks [attachment=1299]20170507_214441[1].

Hey shayan27! Thanks for including the diagram, much appreciated.

It looks like your Camry uses a group fire system, as opposed to a sequential system that we're used to on most newer models. Many vehicles in the late 80's/early 90's used group fire, sometimes with all of the injectors sharing one or two transistor drivers. It was only later that OE's started adopting sequential injector control, using individual injector drivers.

Paul has several videos covering Multec II injectors on early 90's GM's that use a very similar system:

I think it was an OBD2 mandate that all vehicles have sequential fired injection for improved emissions/fuel economy