Diagnostic Procedure

1. CHECK GROUND CONNECTIONS 
   1. Turn ignition switch OFF.
   2. Loosen and retighten ground three screws on the body.
      Fig 1: Locating Ground Screws

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

      Refer to Ground Inspection  .

   OK or NG 

   1. OK >> GO TO  2.
   2. NG >> Repair or replace ground connections.
2. CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT 
   1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) harness connector.
   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 2: Checking Voltage Between Mass Air Flow Sensor Terminal 5 And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
   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 

   1. OK >> GO TO  4.
   2. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK INTAKE AIR TEMPERATURE SENSOR 

   Refer to Component Inspection  .

   OK or NG 

   1. OK >> GO TO  5.
   2. NG >> Replace mass air flow sensor (with intake air temperature sensor).
5. CHECK INTERMITTENT INCIDENT 

   Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END