Diagnostic Procedure

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

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between mass air flow sensor terminal 5 and ground with CONSULT-II or tester.
   1. Voltage: Approximately 5V 

OK or NG 

1. OK: GO TO  3.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

Fig 2: Checking Voltage Between Mass Air Flow Sensor Terminal 5 And Ground With CONSULT-II Or Tester

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

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect TCM harness connector.
4. Check harness continuity between mass air flow sensor terminal 3 and ECM terminal 67, TCM terminal 42.

   Refer to WIRING DIAGRAM .

   1. Continuity should exist. 
5. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO  4.
2. NG: GO TO 3.

Check the following.

• Harness for open or short between TCM and intake air temperature sensor
• Harness for open or short between ECM and intake air temperature sensor

1. : Repair open circuit or short to ground or short to power in harness or connectors.

Refer to COMPONENT INSPECTION ".

OK or NG 

1. OK: GO TO 5.
2. NG: Replace mass air flow sensor with intake air temperature sensor.

Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

1. INSPECTION END