1993 camry LE 4cyl...

I've read online that this car has a knock sensor...I just cleaned out the IAC valve this weekend and the idle is so much better than before- alot smoother and there's better engine performance, acceleration. My MPG is still about 23/gallon.

I still have a bit of a rough idle. So, I want to check the Knock sensor at this point...(trust me, I've checked and done everything else to get it smooth again from the recommnedations on this site!)

I read online it is located on the engine on drivers side below the intake manifold.

If mine has it...

1) how can i test it with my Digital volt/ohm meter and what are the tolerances?
2) Is it easy to get to and remove?
3) i could make a trip to the junkyard and pull one of I know how to test for a good used one...

any thoughts??