Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to GROUND INSPECTION .

Fig 1: Checking ECM Ground Connections

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

OK or NG 

• OK: GO TO  2.
• NG: Repair or replace ground connections.

1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) harness connector.
2. Turn ignition switch ON.
   Fig 2: Locating Mass Air Flow Sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between mass air flow sensor terminal 5 and ground.
   • Voltage: Approximately 5 V 

Fig 3: Checking Voltage Between Mass Air Flow Sensor Terminal 5 & Ground

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

OK or NG 

• OK: GO TO  3.
• NG: Repair harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 67. Refer to WIRING DIAGRAM .
   • Continuity should exist. 
4. Also check harness for short to ground and short to power.

OK or NG 

• OK: GO TO  4.
• NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to COMPONENT INSPECTION .

OK or NG 

• OK: GO TO  5.
• NG: Replace mass air flow sensor (with intake air temperature sensor).

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

• INSPECTION END