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Home › Nissan-Datsun › 2012 › Sentra SE-R › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS U0101 To P0159 (Qr25DE) › DTC P0101: MAF Sensor › Diagnosis Procedure

Diagnosis Procedure

  1. 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 2.

    NG: Reconnect the parts.

  2. 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 (E9 And E15) And Washer Tank With Fuse And Fusible Link Box
    G08185052Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace ground connections.

  3. 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 (MAF) Sensor
      G04925826Courtesy of NISSAN NORTH AMERICA, INC.
    3. Check voltage between MAF sensor terminal 2 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    Fig 3: Checking MAF Sensor Power Supply Circuit
    G04874965Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

  4. 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.

  5. 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 6.

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

  6. 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 7.

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

  7. CHECK INTAKE AIR TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace mass air flow sensor (with intake air temperature sensor). Refer to , "REMOVAL AND INSTALLATION ".

  8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 9.

    NG: Replace EVAP control system pressure sensor. Refer to , "REMOVAL AND INSTALLATION ".

  9. CHECK MASS AIR FLOW SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: Replace mass air flow sensor. Refer to , "REMOVAL AND INSTALLATION ".

  10. CHECK INTERMITTENT INCIDENT

    Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    INSPECTION END

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