Here's a diagram. The PCV valve is shown on the first page above and to to the left of the text "VENTILATION VALVE SUB ASSEMBLY". It's also shown on page EM 108 in the second diagram.
The valve is hard to see on the vehicle but it's there. It's also kind of difficult to get to and remove because of it's proximity to the firewall and the wiring harness. Here are a couple of tips from my experience with mine.
1. If you decide to clean the PCV valve make sure the solvent you use is safe for plastics. I cleaned mine with some Berryman carb cleaner which may have weakened the plastic. When I put the valve back in, the threaded portion broke off in the engine. Luckily I was able to get it out without too much trouble.
2. If you decide to replace your PCV valve, get an OEM valve from the dealer. When I broke mine it was at 5pm on a Friday. My only option was to try auto parts stores. NAPA carries one for the tacoma. It's all metal and it sort of fits but not very well. I ran that one for about a week before I was able to get an OEM one from the dealer.