Yes it does.
It has a chain.
For the 2.0L engine it is a chain-driven cam.
Chain.
It has a cam chain.
Yes it does.
cam belt
The 2001 Nissan Pathfinder has double overhead cam (DOHC).
The 2001 Nissan Frontier has double overhead cam (DOHC).
The 2001 Nissan Xterra has double overhead cam (DOHC).
The 2001 Nissan Altima has double overhead cam (DOHC).
The 2001 Nissan Maxima has double overhead cam (DOHC).
The 2001 Nissan Sentra has double overhead cam (DOHC).