Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
   Fig 1: Checking 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: Disconnecting Mass Air Flow Sensor (Intake Air Temperature Sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between mass air flow sensor terminal 2 and ground.
   • Voltage: Approximately 5V 
   Fig 3: Checking Intake Air Temperature Sensor Power Supply Circuit

   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. Disconnect TCM harness connector.
4. Check harness continuity between mass air flow sensor terminal 1 and ECM terminal 67, TCM terminal 42.

   Refer to WIRING DIAGRAM .

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

OK or NG

• OK: GO TO  5.
• NG: GO TO 4.

Check the following.

• Harness connectors E19, F33
• Harness for open or short between intake air temperature sensor and ECM
• Harness for open or short between intake air temperature sensor and TCM

• : 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 6.
• NG: Replace mass air flow sensor (with intake air temperature sensor).

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

• : INSPECTION END