September 30: LEMON manuals is back up on a temporary server! Slowness is possible
On Board Diagnosis Logic
WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
If the absence of EGR flow is detected by EGR temperature sensor under the condition that calls for EGR, a low-flow malfunction is diagnosed.
Courtesy of NISSAN MOTOR CO., U.S.A.