Component Inspection

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Mass Airflow Sensor

Reconnect disconnected harness connectors.
Start engine and warm to operating temperature.
Check voltage between ECM terminal No. 72 (Mass airflow sensor signal) for 2.5L and ECM terminal No. 62 (Mass airflow sensor signal) for 3.5L and ground, see Fig 1 - Fig 2 .
If voltage is out of specification:
- Turn ignition switch OFF.
- Disconnect mass airflow sensor harness connector and reconnect it again.
- Perform steps 2 and 3 again.
If "NG", remove mass airflow sensor from air duct. Check hot film for damage or dust.
If "NG", clean or replace mass airflow sensor.

Fig 1: Testing Mass Airflow Sensor For DTC P0102 Or DTC P0103: Mass Airflow Sensor (2.5L)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Testing Mass Airflow Sensor For DTC P0102 Or DTC P0103: Mass Airflow Sensor (3.5L)

Courtesy of NISSAN MOTOR CO., U.S.A.