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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Engine Control System (DTC/Circuit Diagnosis) (1 Of 5)) >> DTC/Circuit Diagnosis >> DTC P0101: MAF Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 

    If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Index .

    NO

    GO TO 2.

  2. 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 3.

    NO

    Reconnect the parts.

  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.

      +

      -

      Voltage

      MAF sensor

      Connector

      Terminal

      F31

      1

      Ground

      Approx. 5 V

    Is the inspection result normal?

    YES

    GO TO 5.

    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.

      MAF sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F31

      1

      F13

      28

      Existed

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Repair or replace error-detected parts.

  5. CHECK MAF SENSOR GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between MAF sensor harness connector and ECM harness connector.

      MAF sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F31

      2

      F13

      40

      Existed
    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 or short to ground or short to power in harness or connectors.

  6. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT 
    1. Check the continuity between MAF sensor harness connector and ECM harness connector.

      MAF sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F31

      3

      F13

      38

      Existed
    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 or short to ground or short to power in harness or connectors.

  7. CHECK INTAKE AIR TEMPERATURE SENSOR 

    Check intake air temperature sensor. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    Replace MAF sensor (with intake air temperature sensor).

  8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Check EVAP control system pressure sensor. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    Replace EVAP control system pressure sensor.

  9. CHECK MAF SENSOR 

    Check MAF sensor. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace MAF sensor. Refer to Removal and Installation .

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