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Home >> Scion >> 2014 >> FR-S Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P000A-U015B) >> SFI System >> DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input [07/2013 - 12/2013] >> Procedure
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DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input [07/2013 - 12/2013]: Procedure

  1. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE) 
    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 / Data List / Intake Air.
    5. Read the value displayed on the Techstream.

      OK

      Same as actual intake air temperature.

      RESULT

      Result Proceed to
      -40°C (-40°F) A
      120°C (248°F) 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 215°C (419°F).

    B → See step   4 

    C → See step   6 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
    1. Disconnect the mass air flow meter connector.
      GTY392626Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals 1 and 2 of the mass air flow meter connector on the wire harness side.
    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 / Data List / Intake Air.
    7. Read the value displayed on the Techstream.

      Standard value

      120°C (248°F)

      TEXT IN ILLUSTRATION

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

    NG → See step   3 

    OK → See step   7 

  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 (Check for open)

      Tester Connection Condition Specified Condition
      A33-12 (THA) - C16-1 (THA) Always Below 1 Ω
      A36-29 (E1) - C16-2 (E2) Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   8 

  4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
    1. Disconnect the mass air flow meter connector.
      GTY390038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 / Data List / 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

    NG → See step   5 

    OK → See step   9 

  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 (Check for short)

      Tester Connection Condition Specified Condition
      A33-12 (THA) or C16-1(THA) - Body ground Always 10 kΩ or higher
      A36-29 (E1) or C16-2 (E2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  6. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [07/2013 - ] 
  7. REPLACE MASS AIR FLOW METER. Refer to  REMOVAL [07/2013 - ] 
  8. REPLACE ECM. Refer to  REMOVAL [07/2013 - 12/2013] 
  9. REPLACE MASS AIR FLOW METER. Refer to  REMOVAL [07/2013 - ] 
  10. REPLACE ECM. Refer to  REMOVAL [07/2013 - 12/2013] 
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