No idea. The only space combat system that I ever used was CT. There were EMP effects there, since you could buy hardened computers to protect against them. There was that nuke-blasted ship in TTA which was still intact enough for the characters to explore, which I always assumed meant it had been torched mostly through EMP.

Even the above, I would imagine that in CT any sensors which were turned on would simply be rated as destroyed, should an EMP hit a ship.