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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (1 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0102, P0103: MAF Sensor >> Component Inspection >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK MASS AIR FLOW (MAF) SENSOR-I

    G-20 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 (Hz)
      MASS AIR FLOW SENSOR (Hz) Ignition switch ON (Engine stopped.) Approx. 3, 720 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 4, 100 - 4, 700 Hz
      Idle to about 4, 000 rpm 4, 100 - 4, 700 to Approx. 8, 000 Hz*

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

    G-21 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 (Hz)
      Connector + -
      Terminal
      F78 38 40 Ignition switch ON (Engine stopped.) Approx. 3, 720 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 4, 100 - 4, 700 Hz
      Idle to about 4, 000 rpm 4, 100 - 4, 700 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 STEP 4  .

    NO 

    GO TO STEP 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 STEP 4  .

    NO 

    GO TO STEP 3  .

  3. CHECK MAF SENSOR-II

    G-20 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 (Hz)
      MASS AIR FLOW SENSOR (Hz) Ignition switch ON (Engine stopped.) Approx. 3, 720 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 4, 100 - 4, 700 Hz
      Idle to about 4, 000 rpm 4, 100 - 4, 700 to Approx. 8, 000 Hz*

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

    G-21 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 (Hz)
      Connector + -
      Terminal
      F78 38 40 Ignition switch ON (Engine stopped.) Approx. 3, 720 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 4, 100 - 4, 700 Hz
      Idle to about 4, 000 rpm 4, 100 - 4, 700 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 STEP 4  .

  4. CHECK MAF SENSOR-III

    G-20 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 (Hz)
      MASS AIR FLOW SENSOR (Hz) Ignition switch ON (Engine stopped.) Approx. 3, 720 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 4, 100 - 4, 700 Hz
      Idle to about 4, 000 rpm 4, 100 - 4, 700 to Approx. 8, 000 Hz*

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

    G-21 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 (Hz)
      Connector + -
      Terminal
      F78 38 40 Ignition switch ON (Engine stopped.) Approx. 3, 720 Hz
      Idle (Engine is warmed-up to normal operating temperature.) 4, 100 - 4, 700 Hz
      Idle to about 4, 000 rpm 4, 100 - 4, 700 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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