September 30: LEMON manuals is back up on a temporary server! Slowness is possible
Diagnostic Procedure For Intake Sensor: Notes
WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM: Intake sensor circuit is open or shorted. (56 or 57 is indicated on front air control as a result of conducting Self-diagnosis).
Courtesy of NISSAN MOTOR CO., U.S.A.