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Home >> Nissan-Datsun >> 2008 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0153 (Qr25DE) >> DTC P0101 MAF Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. INSPECTION START 

    Which malfunction (A or B) is duplicated?

    A or B 

    A: GO TO  3.

    B: GO TO 2.

  2. CHECK INTAKE AIR LEAK 

    Check the following for connections.

    • Air duct
    • Vacuum hoses
    • Intake air passage between air duct and intake manifold

    OK or NG 

    OK: GO TO 3.

    NG: Reconnect the parts.

  3. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screw on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Ground Connections
      G04925825Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace ground connections.

  4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect mass air flow (MAF) sensor (1) harness connector.
      • <=: Vehicle front
    2. Turn ignition switch ON.
      Fig 2: Identifying Mass Air Flow Sensor Harness Connector
      G04925826Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between MAF sensor terminal 2 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  6.

    NG: GO TO 5.

    Fig 3: Checking Voltage Between MAF Sensor Terminal 2 And Ground
    G04874965Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E17, F10
    • Harness for open or short between mass air flow sensor and IPDM E/R
    • Harness for open or short between mass air flow sensor and ECM

    : Repair open circuit or short to ground or short to power in 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 56.

      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 7.

    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 58.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

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

    OK or NG 

    OK: GO TO 8.

    NG: Repair open circuit or short to ground or short or short to power in harness or connectors.

  8. CHECK INTAKE AIR TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 9.

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

  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: Replace EVAP control system pressure sensor.

  10. CHECK MASS AIR FLOW SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 11.

    NG: Replace mass air flow sensor.

  11. CHECK INTERMITTENT INCIDENT 

    Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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