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Home >> Nissan-Datsun >> 2012 >> Quest LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0159 >> DTC P0101: MAF Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK INTAKE SYSTEM

    Check the following for connection.

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

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Reconnect the parts.

  2. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E38. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace ground connection.

  3. CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect MAF sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between MAF sensor harness connector and ground.
      MAF sensor Ground Voltage
      Connector Terminal
      F4 5 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E7, F121
    • Harness for open or short between mass air flow sensor and ECM
    • Harness for open or short between mass air flow sensor and IPDM E/R

      : 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 the continuity between MAF sensor harness connector and ECM harness connector.
      MAF sensor ECM Continuity
      Connector Terminal Connector Terminal
      F4 4 F8 80 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: 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 the continuity between MAF sensor harness connector and ECM harness connector.
      MAF sensor ECM Continuity
      Connector Terminal Connector Terminal
      F4 3 F8 82 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair open circuit or short to ground or short to power in harness or connectors.

  7. CHECK INTAKE AIR TEMPERATURE SENSOR

    Check intake air temperature sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace MAF sensor (with intake air temperature sensor).

  8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Check EVAP control system pressure sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: Replace EVAP control system pressure sensor.

  9. CHECK MAF SENSOR

    Check MAF sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Replace MAF sensor. Refer to "EXPLODED VIEW ".

  10. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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