hmmm...
was just looking at my FSM for the 2004 model frontier. doesnt give too many specific numbers in reference to the injector itself. unless you have the consult computer that they have. then you might get more info, but usually they reference tech data if it needs it, like o2 sensors and knock sensors things like that.
it recommends checking other items and there are certain stats for those like fuel pressure and MAF readings.
most seems to be about being plugged or dirty so that tells me they either work or when theres an issue its obvious.
what kind of info were you looking for?