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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P014F >> DTC P0101, P010B: MAF Sensor >> Diagnosis Procedure
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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 (MAF) SENSOR POWER SUPPLY
    1. Disconnect 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 (V)
      Bank Connector Terminal
      P0101 1 F31 1 Ground Approx. 5
      P010B 2 F42 1

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 4.

  4. CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY CIRCUIT
    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
      P0101 1 F31 1 F102 74 Existed
      P010B 2 F42 1
    4. Also check harness for short to ground and short to power. Is the inspection result normal?

      YES: GO TO 5.

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

  5. CHECK SENSOR POWER SUPPLY 2 CIRCUIT

    Check sensor power supply 2 circuit. Refer to "DIAGNOSIS PROCEDURE ".

    Is the inspection result normal? 

    YES: GO TO  10.

    NO: 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.
      DTC MAF sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0101 1 F31 2 F102 68 Existed
      P010B 2 F42 2 94
    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.
      DTC MAF 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 8.

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

  8. CHECK INTAKE AIR TEMPERATURE SENSOR

    Check intake air temperature sensor (bank 1). Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 9.

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

  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

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

    Is the inspection result normal? 

    YES: GO TO 10.

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

  10. CHECK MAF SENSOR

    Check MAF sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace malfunctioning mass air flow sensor. Refer to "EXPLODED VIEW ".

  11. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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