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Home >> Nissan-Datsun >> 2003 >> Frontier Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 403 (Engine Control System - VG33ER) >> DTC P0101: MAF Sensor >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START 

    Which malfunction (A or B) is duplicated?

    A or B 

    1. A : GO TO  3.
    2. B : GO TO 2.
  2. CHECK INTAKE SYSTEM 

    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.
  3. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine ground screws.
      1. : GO TO 4.
    Fig 1: Retightening Engine Ground Screws
    G00771795Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect mass air flow (MAF) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Disconnecting Mass Air Flow (MAF) Sensor Harness Connector
      G00771796Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between terminal 2 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK : GO TO  6.
    2. NG : GO TO 5.
    Fig 3: Checking Voltage Between Terminal 2 And Ground
    G00771797Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    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.
  6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    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 .

      1. 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.
  7. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 54.

      Refer to WIRING DIAGRAM .

      1. 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.
  8. CHECK MASS AIR FLOW SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK : GO TO 9.
    2. NG : Replace mass air flow sensor.
  9. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. : INSPECTION END. 
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