Not sure about the '97, but on my '98 Frontier, it's housed in a plastic box next to the left headlight. It's the only thing going to that box that has wires. It is located on the base of the air cleaner on the passenger side.
The intake air temperature sensor is built into the MAF sensor on a 1991 Nissan pickup. It is between the air box and the throttle body.
follow your top radiator hose to your intake,its in their.
the air intake valve is located on the side if your air cleaner/air box.
Under the intake (third Head) In the valley between the heads.
in the gas tank, it is part of the fuel level sensor
below the raditor hose that's connected to the thermostat.
where is egr temp sensor located in 97 nissan pickup l4
it is on the hose that comes from the box the air filter is in
follow the top radiator hose to intake
if its a305,or 350 it is located intake by the thermostat housing.or in the t-stat housing
If it's anything like my 1996 Nissan pickup, it'll be inside the air intake compartment...located underneath the air filter. It's a very small sensor held into the bottom of the housing by two screws. It terminates into a 2-pronged plug that connects to the rest of the wiring hardness outside the filter housing.
PCV valve is located under the hood, center, upper engine area, mounted in intake manifold.