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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (1 Of 7) >> Engine (ECM) >> P010D MAF Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK HARNESS CONNECTOR 
    1. Disconnect mass air flow sensor harness connector and ECM harness connector.
    2. Connect mass air flow sensor harness connector and ECM harness connector.
    3. Perform DTC confirmation procedure. Refer to Confirmation Procedure .

    YES>>

    GO TO 2.

    NO>>

    INSPECTION END

  2. CHECK MASS AIR FLOW SENSOR POWER SUPPLY 
    1. Disconnect mass air flow sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between mass air flow sensor harness connector and ground.
      + - Voltage
      (Approx.)
      Mass air flow sensor
      Bank Connector Terminal
      2 F98 2 Ground 5 V

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    GO TO 3.

  3. CHECK MASS AIR FLOW SENSOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between mass air flow sensor harness connector and ECM harness connector.
      Mass air flow sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      2 F98 2 F143 44 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair or replace error-detected parts.

  4. CHECK SENSOR POWER SUPPLY 2 CIRCUIT 

    Refer to Diagnosis Procedure . Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .

    NO>>

    Repair or replace error-detected parts.

  5. CHECK MASS AIR FLOW SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between mass air flow sensor harness connector and ECM harness connector.
      Mass air flow sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      2 F98 3 F143 26 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, short to ground or short to power in harness or connectors.

  6. CHECK ECM GROUND CIRCUIT 
    1. Check the continuity between ECM harness connector and ground.
      + - Continuity
      ECM
      Connector Terminal
      F143 3 Ground Existed
      F142 87
      88
      E152 199
      201
      204
    2. Also check harness for short to power.

    Is the inspection result normal?

    YES>>

    GO TO 7.

    NO>>

    Repair or replace error-detected parts.

  7. CHECK MASS AIR FLOW SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between mass air flow sensor harness connector and ECM harness connector.
      Mass air flow sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      2 F98 1 F143 35 Existed
    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, short to ground or short to power in harness or connectors.

  8. CHECK MASS AIR FLOW SENSOR 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Replace malfunctioning mass air flow sensor. Refer to AIR CLEANER AND AIR DUCT : Exploded View .

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