Yes and No.
Being a computer and tied in with more computers, allows them to run some pretty decent diagnostics, but if a final driver is bad, there is not way to determine if the final output is there or not. This is where the tech comes in. He can get the diagnostics info that tells him the output is on and working, and he can then check with a meter to verify that it actually exists.
It was easy to make that sound easy, however sometimes this can be a rather laborious task.