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Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (P0010-P0128) >> SFI System >> DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input [08/2019 - ] >> Procedure
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DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input [08/2019 - ]: Procedure

  1. READ VALUE USING TECHSTREAM (INTAKE AIR) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
    5. Read the value displayed on the Techstream.

      OK

      Same as actual intake air temperature.

      Result

      Temperature Displayed Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      Same as actual intake air temperature C

      HINT: 

      • If there is an open circuit, the Techstream indicates -40°C (-40°F).
      • If there is a short circuit, the Techstream indicates 140°C (284°F) or higher.

    Result: 

    B 

    See step  4

    Result: 

    C 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2015 - ] 

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
    GTY875411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the mass air flow meter connector.
    2. Connect terminals THA and E2 of the mass air flow meter wire harness side connector.
    3. Connect the Techstream to the DLC3.
    4. Turn the ignition switch to ON.
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
    7. Read the value displayed on the Techstream.

      Standard value

      140°C (284°F) or higher

      TEXT IN ILLUSTRATION

      *1 Mass Air Flow Meter
      *2 ECM
      *a Front view of wire harness connector
      (to Mass Air Flow Meter)

    Result: 

    OK 

    CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the mass air flow 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
      B35-1 (THA) - B37-17 (THA) Always Below 1 Ω
      B35-2 (E2) - B37-14 (EAIP) Always Below 1 Ω

    Result: 

    OK 

    CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
    GTY859816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the mass air flow meter connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Intake Air.
    6. Read the value displayed on the Techstream.

      Standard value

      -40°C (-40°F)

      TEXT IN ILLUSTRATION

      *1 Mass Air Flow Meter
      *2 ECM

    Result: 

    OK 

    REPLACE MASS AIR FLOW METER. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the mass air flow 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
      B35-1 (THA) or B37-17 (THA) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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