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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 >> Component Inspection

Component Inspection

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 MASS AIR FLOW (MAF) SENSOR-I 

    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.
    5. Select "MASS AIR FLOW SENSOR (Hz)" and check the indication.

      Monitor item

      Condition

      Indication

      MASS AIR FLOW SENSOR (Hz)

      Ignition switch ON (Engine stopped.)

      Approx. 3, 720 Hz

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

      3, 900 - 4, 500 Hz

      Idle to about 4, 000 rpm

      3, 900 - 4, 500 to Approx. 8, 000 Hz*

      *: Check for linear frequency 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 frequency between ECM harness connector terminals under the following conditions.

      ECM

      Condition

      Frequency

      Connector

      +

      -

      Terminal

      F13

      38

      40

      Ignition switch ON (Engine stopped.)

      Approx. 3, 720 Hz

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

      3, 900 - 4, 500 Hz

      Idle to about 4, 000 rpm

      3, 900 - 4, 500 to Approx. 8, 000 Hz*

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

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 2.

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

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 3.

  3. CHECK MAF SENSOR-II 

    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.
    4. Select "MASS AIR FLOW SENSOR (Hz)" and check the indication.

      Monitor item

      Condition

      Indication

      MASS AIR FLOW SENSOR (Hz)

      Ignition switch ON (Engine stopped.)

      Approx. 3, 720 Hz

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

      3, 900 - 4, 500 Hz

      Idle to about 4, 000 rpm

      3, 900 - 4, 500 to Approx. 8, 000 Hz*

      *: Check for linear frequency 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 frequency between ECM harness connector terminals under the following conditions.

      ECM

      Condition

      Frequency

      Connector

      +

      -

      Terminal

      F13

      38

      40

      Ignition switch ON (Engine stopped.)

      Approx. 3, 720 Hz

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

      3, 900 - 4, 500 Hz

      Idle to about 4, 000 rpm

      3, 900 - 4, 500 to Approx. 8, 000 Hz*

      *: Check for linear frequency 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 MAF SENSOR-III 

    SYMBOL With CONSULT

    1. Turn ignition switch OFF.
    2. Disconnect MAF 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.
    5. Select "MASS AIR FLOW SENSOR (Hz)" and check the indication.

      Monitor item

      Condition

      Indication

      MASS AIR FLOW SENSOR (Hz)

      Ignition switch ON (Engine stopped.)

      Approx. 3, 720 Hz

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

      3, 900 - 4, 500 Hz

      Idle to about 4, 000 rpm

      3, 900 - 4, 500 to Approx. 8, 000 Hz*

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

    SYMBOL Without CONSULT

    1. Turn ignition switch OFF.
    2. Disconnect MAF sensor harness connector and reconnect it again.
    3. Start engine and warm it up to normal operating temperature.
    4. Check the frequency between ECM harness connector terminals under the following conditions.

      ECM

      Condition

      Frequency

      Connector

      +

      -

      Terminal

      F13

      38

      40

      Ignition switch ON (Engine stopped.)

      Approx. 3, 720 Hz

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

      3, 900 - 4, 500 Hz

      Idle to about 4, 000 rpm

      3, 900 - 4, 500 to Approx. 8, 000 Hz*

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

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Clean or replace MAF sensor. Refer to Removal and Installation .

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