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 

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

1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) sensor harness connector.
   Fig 2: Locating Mass Air Flow Sensor (Intake Air Temperature Sensor Is Built-Into) Sensor Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between MAF sensor terminal 5 and ground with CONSULT-II or tester.
   1. Voltage: Approximately 5V 
   Fig 3: Checking Voltage Between MAF Sensor Connector Terminal 5 And Ground

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

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.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect TCM harness connector (A/T models).
4. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 67, TCM terminal 42 (A/T models).

   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  5.
2. NG : GO TO 4.

Check the following.

• Harness for open or short between TCM and MAF sensor (A/T models).
• Harness for open or short between ECM and MAF 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 6.
2. NG : Replace mass air flow sensor (with intake temperature sensor).

Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. : INSPECTION END