Mass Air Flow Sensor

Reconnect all harness connectors disconnected.
Start engine and warm it up to normal operating temperature.

Fig 1: Voltage Specifications Based On Conditions
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between ECM terminal 51 (Mass air flow sensor signal) and ground.

Fig 2: Checking Voltage Between ECM And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
If the voltage is out of specification, proceed the following.
- Turn ignition switch OFF.
- Disconnect mass air flow sensor harness connector and reconnect it again.
- Perform steps 2 and 3 again.
If NG, remove mass air flow sensor from air duct. Check hot film for damage or dust.
If NG, clean or replace mass air flow sensor.