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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Engine Control System - Diagnostic Codes (02 Of 10)) >> SFI SYSTEM (for Gasoline Model) >> DTC P0110-15: Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open [10/2022 - ] >> Procedure

DTC P0110-15: Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VEHICLE CONDITION 

    Result

    Result  Proceed to
    except Mexico models A
    Mexico models B

    Result: 

    B 

    See step  3

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS) 

    Pre-procedure1

    • Disconnect the mass air flow meter sub-assembly connector.
    • Connect terminals 4 (THA) and 2 (E2G) of the mass air flow meter sub-assembly connector on the wire harness side.
    • According to the display on the GTS, read the Data List.
      GTY1131639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Mass Air Flow Meter Sub-assembly *2 ECM
      *a Front view of wire harness connector
      (to Mass Air Flow Meter Sub-assembly)      		 - -

      Powertrain > Engine > Data List 

      Tester Display
      Intake Air Temperature

      Result

      Result Proceed to
      Intake Air Temperature is more than 128 °C A
      None of the above conditions are met B

      HINT: 

      128°C = 262°F

    Post-procedure1

    • None.

    Result: 

    A 

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    B 

    See step  4

  3. READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS) 

    Pre-procedure1

    • Disconnect the mass air flow meter sub-assembly connector.
    • Connect terminals 4 (THA) and 2 (E2G) of the mass air flow meter sub-assembly connector on the wire harness side.
    • According to the display on the GTS, read the Data List.
      GTY1131638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Mass Air Flow Meter Sub-assembly *2 ECM
      *a Front view of wire harness connector
      (to Mass Air Flow Meter Sub-assembly)      		 - -

      Powertrain > Engine > Data List 

      Tester Display
      Intake Air Temperature

      Result

      Result Proceed to
      Intake Air Temperature is more than 138 °C A
      None of the above conditions are met B

      HINT: 

      138°C = 280°F

    Post-procedure1

    • None.

    Result: 

    A 

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    B 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) 

    Pre-procedure1

    • Disconnect the mass air flow meter sub-assembly connector.
    • Disconnect the ECM connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B14-4 (THA) - B27-76 (THA) Always Below 1 Ω Ω
      B14-2 (E2G) - B27-74 (E2G) Always Below 1 Ω Ω
      B14-4 (THA) or B27-76 (THA) - Other terminals Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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