Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten four 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: Identifying Mass Air Flow Sensor And Air Cleaner

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between mass air flow sensor terminal 5 and ground with CONSULT-III or tester.

   Voltage: Approximately 5V 

Fig 3: Checking Voltage Between Mass Air Flow Sensor Terminal 5 And Ground

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. 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 

OK: GO TO  4.

NG: 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  5.

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

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ."

>>INSPECTION END