Diagnostic Procedure

Which malfunction (A or B) is duplicated?

A or B 

1. A: GO TO  3.
2. B: GO TO 2.

Check the following for connection.

• Air duct
• Vacuum hoses
• Intake air passage between air duct to intake manifold collector

OK or NG 

1. OK: GO TO 3.
2. NG: Reconnect the parts.

1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
   1. : GO TO 4.

Fig 1: Locating Engine Ground Screws

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

1. Disconnect mass air flow (MAF) sensor harness connector.
2. Turn ignition switch ON.
   Fig 2: Locating Mass Air Flow (MAF) Sensor Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between terminal 2 and engine ground with CONSULT-II or tester.

   Voltage: Battery voltage 

   Fig 3: Checking Voltage Between Terminal 2 And Engine Ground

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

OK or NG 

1. OK: GO TO  6.
2. NG: GO TO 5.

Check the following.

• Harness for open or short between ECM relay and mass air flow sensor
• Harness for open or short between mass air flow sensor and ECM
  1. : Repair harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 55. Refer to WIRING DIAGRAM .

   Continuity should exist. 

4. Also check harness for short to power.

OK or NG 

1. OK: GO TO 7.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 54. Refer to WIRING DIAGRAM .

   Continuity should exist. 

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

OK or NG 

1. OK: GO TO 8.
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 9.
2. NG: Replace mass air flow sensor.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. : INSPECTION END