According to http://wiki.answers.com/Q/Pcv_valve_on_toyota_camry_2003
On the oil fill cap side of the valve cover. To access the PCV valve you will need to remove the protective plastic cover mounted over the valve cover area. Two small nuts are holding it in place. Unlike other PCV valves you may have changed in the past, this one is screwed into the valve cover instead of being inserted into a grommet. You will need a 22 mm deep socket or a suitable wrench to remove it.
Edgewood Auto Parts #253