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Home >> Infiniti >> 2012 >> FX50 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (VK50VE) - FX50 - DTC U0101, U0113, U1003, U1001, U1024 & P006A Through P0133 / P0153 >> DTC P0102, P0103, P010C, P010D: MAF Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. INSPECTION START

    Confirm the detected DTC.

    Which DTC is detected? 

    P0102, P010C: GO TO 2.

    P0103, P010D: 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 M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair or replace ground connection.

  4. CHECK MASS AIR FLOW 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.
    DTC MAF sensor Ground Voltage
    Bank Connector Terminal
    P0102, P0103 1 F86 5 Ground Battery voltage
    P010C, P010D 2 F85 5

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following:

    • Harness connectors E106, M6
    • Harness connectors M116, F103
    • 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, 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.
      DTC MAF sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0102, P0103 1 F86 4 F110 42 Existed
      P010C, P010D 2 F85 4 38
    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, 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.
      DTC MAF sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0102, P0103 1 F86 3 F110 47 Existed
      P010C, P010D 2 F85 3 43
    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, 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 malfunctioning mass air flow sensor. Refer to "EXPLODED VIEW ".

  9. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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