Mass Air Flow Sensor

Turn ignition switch ON.
Start engine and warm it up to normal operating temperature.
Check voltage between ECM terminal 54 (Mass air flow sensor signal) and ground.

Fig 1: Voltage Graph
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Voltage Between ECM Terminal And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it again. Repeat above check.
If NG, remove mass air flow sensor from air duct. Check hot wire for damage or dust.

Fig 3: Identifying Mass Air Flow Sensor
Courtesy of NISSAN MOTOR CO., U.S.A.