Contrary to what I suggested above, let me indeed try to put a little more meat on this issue. For it seems to me that discussants still imagine they can figure out definitively what happens from some entry in some manual somewhere.
Fail-stop means the channel goes dead. No traffic. Tyropicard's contribution said what happens then.
Let's consider fail-live.
If your FADEC sends the signal to reduce fuel flow, your engine is going to idle back.
If your FADEC sends the signal to send fuel flow to max, your engine is going to go to max thrust.
If the FADEC sends oscillating signals to put fuel flow at min, then at max, then at min, then at max,.... with a frequency of X Hertz, then ..... well, somebody who designed the system can maybe tell us what your engine is going to do. Does it depend on the value of X?
Then there are the infinitely varied other signal behaviors that can occur.
PBL