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Home >> Nissan-Datsun >> 2009 >> Cube Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0172 >> DTC P0102, P0103: MAF Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. INSPECTION START

    Confirm the detected DTC.

    Which DTC is detected? 

    P0102: GO TO 2.

    P0103: GO TO  3.

  2. CHECK INTAKE SYSTEM

    Check the following for connection.

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

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Reconnect the parts.

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

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair or replace ground connection.

  4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect mass air flow (MAF) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between MAF sensor harness connector and ground.
    VOLTAGE SPECIFICATION

    MAF sensor Ground Voltage
    Connector Terminal
    F4 5 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E8, F1
    • 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.

  6. 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.
      CONTINUITY SPECIFICATION

      MAF sensor ECM Continuity
      Connector Terminal Connector Terminal
      F4 4 F8 52 Existed
    4. 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 MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between MAF sensor harness connector and ECM harness connector.
      CONTINUITY SPECIFICATION

      MAF sensor ECM Continuity
      Connector Terminal Connector Terminal
      F4 3 F8 45 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: 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 ".

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: Replace mass air flow sensor.

  9. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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