Diagnostic Procedure

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

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) harness connector. See Figure.
2. Turn ignition switch ON.
3. Check voltage between mass air flow sensor terminal 5 and ground.

Voltage: Approximately 5V 

OK or NG

1. OK: Go to 3.
2. NG: Repair harness or connectors.
   Fig 1: Testing IAT Sensor Reference Voltage

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

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. See Figure.

   Continuity should exist  .

4. Also check harness for short to ground and short to power.

OK or NG

1. OK: Go to 4.
2. NG: 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).

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

1. Inspection end