2.5 wont start

i have a 1991 s10 2.5 liter that will not start. i have spark, and fuel to the injector but nothing from the injector. how do i determine if the injector is bad or something is not telling it to spray? any help would be appreciated.

i have a 1991 s10 2.5 liter that will not start. i have spark, and fuel to the injector but nothing from the injector. how do i determine if the injector is bad or something is not telling it to spray? any help would be appreciated.

Does injector have 12 volts to pos. side?
Does injector get ground pulse to neg. side cranking?