The pin's should read 10k or below between them according to the ford thing on it i read.
What i'd do if i was you sly is get the plug off, disconnect the
ecu completely, and then measure between the wires for the knock sensor, and it should read open, and then put a pin between both to short it and it should read below 1ohm i'd assume.
If that tests ok, then open up the
ecu and visually check around the little board that is on the
pcm at a 90 degree angle, i expect that sometimes they could crack the solder due to the way its mounted and therefore would need a touch up with the soldering iron.