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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 >> Diagnosis Procedure >> 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. INSPECTION START

    Confirm the detected DTC.

    Which DTC is detected?

    P0102 

    GO TO STEP 2  .

    P0103 

    GO TO STEP 3  .

  2. CHECK INTAKE SYSTEM

    Check the following for connection.

    • Air duct
    • Vacuum hoses
    • Intake air passage between air duct to intake manifold

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Reconnect the parts.

  3. CHECK MAF SENSOR POWER SUPPLY

    1. Disconnect mass air flow (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
      F74 1 Ground Approx. 5 V

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    GO TO STEP 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
      F74 1 F78 28 Existed

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    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
      F74 2 F78 40 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair open circuit, 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
      F74 3 F78 38 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair open circuit, short to ground or short to power in harness or connectors.

  7. CHECK MASS AIR FLOW SENSOR

    Check mass air flow sensor. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Replace mass air flow sensor. Refer to REMOVAL AND INSTALLATION .

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