Mass Air Flow Sensor

Reconnect all harness connectors disconnected.
Start engine and warm it up to normal operating temperature.
Check voltage between ECM terminal 51 (Mass air flow sensor signal) and ground.

Fig 1: Checking Voltage At ECM Connector Terminal 51
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: ECM Connector Terminal 51 Continuity Specifications
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.