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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 502 (Engine Control System (DTC/Circuit Diagnosis) (1 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0101: MAF Sensor >> Component Inspection

Component Inspection

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MASS AIR FLOW SENSOR-1 

    SYMBOL With CONSULT

    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Start engine and warm it up to normal operating temperature.
    4. Connect CONSULT and select "DATA MONITOR" mode of "ENGINE".
    5. Select "MAS A/F SE-B1" and check indication.

      Monitor item

      Condition

      MAS A/F SE-B1

      MAS A/F SE-B1

      Ignition switch ON (Engine stopped.)

      Approx. 0.4 V

      Idle (Engine is warmed-up to normal operating temperature.)

      0.9 - 1.2 V

      2, 500 rpm (Engine is warmed-up to normal operating temperature.)

      1.5 - 1.8 V

      Idle to about 4, 000 rpm

      0.9 - 1.2 V to Approx. 2.4 V*

      *: Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

    SYMBOL Without CONSULT

    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Start engine and warm it up to normal operating temperature.
    4. Check the voltage between ECM harness connector terminals.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      -

      Terminal

      F54

      38

      40

      Ignition switch ON (Engine stopped.)

      0.4 V

      Idle (Engine is warmed-up to normal operating temperature.)

      0.9 - 1.2 V

      2, 500 rpm (Engine is warmed-up to normal operating temperature.)

      1.5 - 1.8 V

      Idle to about 4, 000 rpm

      0.9 - 1.2 V to 2.4 V*

      *: Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    GO TO 2.

  2. CHECK FOR THE CAUSE OF UNEVEN AIR FLOW THROUGH MASS AIR FLOW SENSOR 
    1. Turn ignition switch OFF.
    2. Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
      • Crushed air ducts
      • Malfunctioning seal of air cleaner element
      • Uneven dirt of air cleaner element
      • Intake valve deposits
      • Improper specification of intake air system parts

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 3.

  3. CHECK MASS AIR FLOW SENSOR-2 

    SYMBOL With CONSULT

    1. Repair or replace malfunctioning part.
    2. Start engine and warm it up to normal operating temperature.
    3. Connect CONSULT and select "DATA MONITOR" mode of "ENGINE".
    4. Select "MAS A/F SE-B1" and check indication.

      Monitor item

      Condition

      MAS A/F SE-B1

      MAS A/F SE-B1

      Ignition switch ON (Engine stopped.)

      Approx. 0.4 V

      Idle (Engine is warmed-up to normal operating temperature.)

      0.9 - 1.2 V

      2, 500 rpm (Engine is warmed-up to normal operating temperature.)

      1.5 - 1.8 V

      Idle to about 4, 000 rpm

      0.9 - 1.2 V to Approx. 2.4 V*

      *: Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

    SYMBOL Without CONSULT

    1. Repair or replace malfunctioning part.
    2. Start engine and warm it up to normal operating temperature.
    3. Check the voltage between ECM harness connector terminals.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      -

      Terminal

      F54

      38

      40

      Ignition switch ON (Engine stopped.)

      0.4 V

      Idle (Engine is warmed-up to normal operating temperature.)

      0.9 - 1.2 V

      2, 500 rpm (Engine is warmed-up to normal operating temperature.)

      1.5 - 1.8 V

      Idle to about 4, 000 rpm

      0.9 - 1.2 V to 2.4 V*

      *: Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    GO TO 4.

  4. CHECK MASS AIR FLOW SENSOR-3 

    SYMBOL With CONSULT

    1. Turn ignition switch OFF.
    2. Disconnect mass air flow sensor harness connector and reconnect it again.
    3. Start engine and warm it up to normal operating temperature.
    4. Connect CONSULT and select "DATA MONITOR" mode of "ENGINE".
    5. Select "MAS A/F SE-B1" and check indication.

      Monitor item

      Condition

      MAS A/F SE-B1

      MAS A/F SE-B1

      Ignition switch ON (Engine stopped.)

      Approx. 0.4 V

      Idle (Engine is warmed-up to normal operating temperature.)

      0.9 - 1.2 V

      2, 500 rpm (Engine is warmed-up to normal operating temperature.)

      1.5 - 1.8 V

      Idle to about 4, 000 rpm

      0.9 - 1.2 V to Approx. 2.4 V*

      *: Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

    SYMBOL Without CONSULT

    1. Turn ignition switch OFF.
    2. Disconnect mass air flow sensor harness connector and reconnect it again.
    3. Start engine and warm it up to normal operating temperature.
    4. Check the voltage between ECM harness connector terminals.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      -

      Terminal

      F54

      38

      40

      Ignition switch ON (Engine stopped.)

      0.4 V

      Idle (Engine is warmed-up to normal operating temperature.)

      0.9 - 1.2 V

      2, 500 rpm (Engine is warmed-up to normal operating temperature.)

      1.5 - 1.8 V

      Idle to about 4, 000 rpm

      0.9 - 1.2 V to 2.4 V*

      *: Check for linear voltage rise in response to engine being increased to about 4, 000 rpm.

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Clean or replace mass air flow sensor. Refer to Exploded View .

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