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Home >> Infiniti >> 2013 >> EX37 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0152 >> DTC P0101, P010B: MAF Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK INTAKE SYSTEM 

    Check the following items to see the installation condition and the connection condition of the joint.

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

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Reconnect or replace error-detected parts.

  2. CHECK MASS AIR FLOW SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect mass air flow sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between mass air flow sensor harness connector and ground.
      DTC + - Voltage
      Mass air flow sensor
      Bank Connector Terminal
      P0101 1 F31 5 Ground Battery voltage
      P010B 2 F42

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • 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
    • Loose or poor connection for each connector and harness

      : Repair or replace error-detected parts.

  4. CHECK MASS AIR FLOW SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between mass air flow sensor harness connector and ECM harness connector.
      DTC Mass air flow sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0101 1 F31 4 F102 68 Existed
      P010B 2 F42 4 94
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace error-detected parts.

  5. CHECK MASS AIR FLOW SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between mass air flow sensor harness connector and ECM harness connector.
      DTC Mass air flow sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0101 1 F31 3 F102 77 Existed
      P010B 2 F42 3 79
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair or replace error-detected parts.

  6. CHECK INTAKE AIR TEMPERATURE SENSOR 

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

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Replace mass air flow sensor (with intake air temperature sensor) (bank 1). Refer to "EXPLODED VIEW ".

  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES-1 (DTC P0101 is detected): GO TO 8.

    YES-2 (DTC P010B is detected): GO TO  9.

    NO: Replace EVAP control system pressure sensor. Refer to "EXPLODED VIEW ".

  8. CHECK MASS AIR FLOW SENSOR (BANK 1) 

    Check mass air flow sensor (bank 1). Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Check intermittent Incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Replace mass air flow sensor (bank 1). Refer to "EXPLODED VIEW ".

  9. CHECK MASS AIR FLOW SENSOR (BANK 2) 

    Check mass air flow sensor (bank 2). Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Check intermittent Incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Replace mass air flow sensor (bank 2). Refer to "EXPLODED VIEW ".

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