Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 Through P0153 >> DTC P006A, P0101, P010B: 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 M95. 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 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 Mass air flow sensor Ground Voltage
      Bank Connector Terminal
      P006A, P0101 1 F31 5 Ground Battery voltage
      P006A, P010B 2 F42 5

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. 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.

  5. 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
      P006A, P0101 1 F31 4 F102 68 Existed
      P006A, 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 6.

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

  6. 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
      P006A, P0101 1 F31 3 F102 77 Existed
      P006A, 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 7.

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

  7. CHECK MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR 

    Check manifold absolute pressure (MAP) sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace manifold absolute pressure (MAP) sensor. Refer to "EXPLODED VIEW ".

  8. CHECK INTAKE AIR TEMPERATURE SENSOR 

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

    Is the inspection result normal? 

    YES: GO TO 9.

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

  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES-1 (Only DTC P006A is detected): GO TO 10.

    YES-2 (DTC P006A and P0101 are detected): GO TO  11.

    YES-3 (DTC P006A and P010B are detected): GO TO  12.

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

  10. CHECK MASS AIR FLOW SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: Replace mass air flow sensor (bank 1) and (bank 2). Refer to "EXPLODED VIEW ".

  11. CHECK MASS AIR FLOW SENSOR (BANK 1) 

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

    Is the inspection result normal? 

    YES: GO TO  13.

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

  12. CHECK MASS AIR FLOW SENSOR (BANK 2) 

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

    Is the inspection result normal? 

    YES: GO TO 13.

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

  13. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

scientia non olet · About Mike's Workshop Manuals