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DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input [08/2015 - ]: Procedure

  1. READ DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTCs.
      RESULT

      Result Proceed to
      DTC P0102 is output A
      DTC P0103 is output B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) 
    GTY539716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the Mass Air Flow (MAF) meter connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      C3-1 (+B) - Body ground Engine switch on (IG) 11 to 14 V

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the MAF meter connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C3-3 (VG) - C53-68 (VG) Always Below 1 Ω
      C3-2 (E2G) - C53-70 (E2G) Always Below 1 Ω
      C3-3 (VG) or C53-68 (VG) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. INSPECT MASS AIR FLOW METER 
    1. Inspect the mass air flow meter, referring to the On-vehicle Inspection for Mass Air Flow Meter (Refer to ON-VEHICLE INSPECTION [08/2015 - ] ).
    2. Inspect the mass air flow meter, referring to the Inspection for Mass Air Flow Meter (Refer to INSPECTION [08/2015 - ] ).
    3. Inspect the function of the mass air flow meter.
      1. Connect the Techstream to the DLC3.
      2. Start the engine.
      3. Turn the Techstream on.
      4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF.
      5. Check that the mass air flow meter value changes when the engine is raced.

        OK

        The reading changes.

        HINT: 

        Perform "Inspection After Repair" after replacing the mass air flow meter (Refer to INITIALIZATION [08/2015 - ] ).

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPLACE MASS AIR FLOW METER 

    (Refer to REMOVAL [08/2015 - ] )

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - NO. 2 INTEGRATION RELAY) 
    1. Disconnect the MAF meter connector.
    2. Remove the No. 2 integration relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C3-1 (+B) - 1Q-1 Always Below 1 Ω
      C3-1 (+B) or 1Q-1 - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    CHECK ECM POWER SOURCE CIRCUIT 

    (Refer to ECM Power Source Circuit [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the MAF meter connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C3-3 (VG) - C53-68 (VG) Always Below 1 Ω
      C3-2 (E2G) - C53-70 (E2G) Always Below 1 Ω
      C3-3 (VG) or C53-68 (VG) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SENSOR GROUND) 
    GTY545552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the MAF meter connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C3-2 (E2G) - Body ground Always Below 1 Ω

      HINT: 

      Perform "Inspection After Repair" after replacing the mass air flow meter (Refer to INITIALIZATION [08/2015 - ] ).

    Result: 

    OK 

    REPLACE MASS AIR FLOW METER 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - ] )

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