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Home >> Toyota >> 2012 >> Yaris Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Sedan) (Diagnostic Codes P0010-P0354) >> SFI SYSTEM (for Sedan) >> DTC P0110: Intake Air Temperature Circuit Malfunction; DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input >> Procedure
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DTC P0110: Intake Air Temperature Circuit Malfunction; 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 / Intake Air.
    5. Read the value displayed on the Techstream.

      OK

      Same as actual Intake Air Temperature (IAT).

      RESULT

      Temperature Displayed Proceed To
      -40 °C (-40°F) A
      128°C (262°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 128°C (262°F) or higher.

    B → See step   7 

    C → See step   4 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
    Fig 1: Identifying C26 Mass Air Flow Meter Connector
    GTY236300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C26 Mass Air Flow (MAF) meter connector.
    2. Connect terminals THA and E2 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 / Intake Air.
    7. Read the value displayed on the Techstream.

      Standard Value

      128°C (262°F) or higher

    8. Reconnect the MAF meter connector.

    NG → See step   3 

    OK → See step   5 

  3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    Fig 2: Identifying C26 Mass Air Flow Meter & ECM Connectors
    GTY237077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C26 MAF meter connector.
    2. Disconnect the C20 ECM connector.
    3. Check the resistance.

      Standard resistance

      Tester Connections Specified Conditions
      THA (C26-4) - THA (C20-65) Below 1 Ω
      E2 (C26-5) - ETHA (C20-88)
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  4. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  5. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER. Refer to  REMOVAL 
  6. CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM. Refer to  REMOVAL 
  7. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
    Fig 3: Checking Short In Wire Harness
    GTY226352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C26 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 / Intake Air.
    6. Read the value displayed on the Techstream.

      Standard Value

      -40°C (-40°F)

    7. Reconnect the MAF meter connector.

    NG → See step   8 

    OK → See step   9 

  8. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    Fig 4: Identifying C26 MAF Meter And C20 ECM Connector Terminals
    GTY225702Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C26 MAF meter connector.
    2. Disconnect the C20 ECM connector.
    3. Check the resistance.

      Standard resistance

      Tester Connections Specified Conditions
      THA (C26-4) or THA (C20-65) - Body ground 10 kΩ or higher
    4. Reconnect the MAF meter connector.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  9. REPLACE MASS AIR FLOW METER. Refer to  REMOVAL 
  10. REPLACE ECM. Refer to  REMOVAL 
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