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Home >> Toyota >> 2010 >> FJ Cruiser 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Diagnostic Codes (P0010-P0339) >> SFI System >> DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input >> Procedure
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DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input: 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 and ECT / Data List / Intake Air.
    5. Read the value displayed on the Techstream.

      OK

      Same as actual Intake Air Temperature (IAT).

      RESULT

      Result Proceed to
      -40 °C (-40 °F) A
      140 °C (284 °F) or higher B
      Same as actual IAT 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.

    C → See step   7 

    B → See step   4 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
    Fig 1: Identifying Mass Air Flow Meter Wire Harness Side Connector
    GTY183814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the Mass Air Flow (MAF) meter connector.
    2. Connect terminals THA and ETHA of the MAF 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 / Intake Air.
    7. Read the value displayed on the Techstream.

      Standard

      140 °C (284 °F) or higher

      TEXT IN ILLUSTRATION

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

    NG → See step   3 

    OK → See step   8 

  3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM) 
    Fig 2: Identifying THA And ETHA Terminals Of ECM Connector
    GTY170056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the MAF meter connector.
    2. Connect terminals THA and ETHA of the ECM connector.

      HINT: 

      Before checking, do visual and contact pressure checks on the ECM 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 / Intake Air.
    7. Read the value displayed on the Techstream.

      Standard

      140 °C (284 °F) or higher.

      TEXT IN ILLUSTRATION

      *1 MAF Meter
      *2 ECM
      *3 Component with harness connected
      (ECM)

    NG → See step   9 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
    Fig 3: Identifying Mass Air Flow Meter And ECM Circuit
    GTY179141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the MAF 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 / Intake Air.
    6. Read the value displayed on the Techstream.

      Standard

      -40 °C (-40 °F)

      TEXT IN ILLUSTRATION

      *1 MAF Meter
      *2 ECM

    NG → See step   5 

    OK → See step   10 

  5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT ECM) 
    Fig 4: Identifying Rear View Of Wire Harness Connector, MAF Meter And ECM
    GTY188309Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the ECM 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 / Intake Air.
    6. Read the value displayed on the Techstream.

      Standard

      -40 °C (-40 °F)

      TEXT IN ILLUSTRATION

      *1 MAF Meter
      *2 ECM
      *3 Rear view of wire harness connector
      (to ECM)

    NG → See step   6 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. REPLACE ECM. Refer to  REMOVAL 
  7. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  8. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER. Refer to  REMOVAL 
  9. CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM. Refer to  REMOVAL 
  10. REPLACE MASS AIR FLOW METER. Refer to  REMOVAL 
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