Looks like the tensioner on a 00 (checked a '99 and '01) is on the P/S pump. Unlike the YJ, the bolt is on the inside facing in. What I mean is when looking at the engine, he's behind the fan, on the bottom left side of the P/S pump with the head facing towards teh passenger side.
It say's to first loosen the idler pulley bolt then adjust the tension.