WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
Inspect all timing chains and associated parts for wear or damage, replace as necessary.
Courtesy of NISSAN NORTH AMERICA, INC.
CAUTION:
Check for cracks and any excessive wear at link plates. Replace chain (if necessary).