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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Engine Control System (2UR-GSE) - Diagnostic Codes (1 Of 4)) >> SFI System >> DTC P0102: Mass Air Flow Circuit Low; DTC P0103: Mass Air Flow Circuit High [11/2021 - ] >> Procedure

DTC P0102: Mass Air Flow Circuit Low; DTC P0103: Mass Air Flow Circuit High [11/2021 - ]: Procedure

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  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY) 
    GTY1084235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Mass Air Flow Meter Sub-assembly)
    1. Disconnect the mass air flow meter sub-assembly 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 Condition Specified Condition
      F188-3 (5V) - F188-2 (E2G) Engine switch on (IG) 4.8 to 5.2 V
      F188-1 (FG) - F188-2 (E2G) Engine switch on (IG) 4.8 to 5.2 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Inspect the mass air flow meter sub-assembly.

      Refer to ON-VEHICLE INSPECTION [11/2021 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0102 OR P0103 IS OUTPUT AGAIN) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2021 - ]

      Powertrain > Engine > Clear DTCs 

    4. Turn the engine switch off and wait for at least 30 seconds.
    5. Turn the engine switch on (IG) and turn the Techstream on.
    6. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    7. Enter the following menus: Powertrain / Engine / Trouble Codes.
    8. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P0102 or P0103 is output A
      DTCs are not output B

    Result: 

    A 

    REPLACE ECM. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    B 

    END 

  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) 
    1. Disconnect the mass air flow meter sub-assembly 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
      F152-21 (VCVG) - F188-3 (5V) Always Below 1 Ω
      F152-23 (VG) - F188-1 (FG) Always Below 1 Ω
      F152-24 (E2G) - F188-2 (E2G) Always Below 1 Ω
      F152-21 (VCVG) or F188-3 (5V) - Body ground Always 10 kΩ or higher
      F152-23 (VG) or F188-1 (FG) - Body ground Always 10 kΩ or higher
      F152-24 (E2G) or F188-2 (E2G) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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