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СИСТЕМА ECD, Diagnostic DTC:P0110/24, P0112/24, P0113/24

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DTC Code DTC Name
P0110/24 Intake Air Temperature Circuit
P0112/24 Intake Air Temperature Circuit Low Input
P0113/24 Intake Air Temperature Circuit High Input
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DESCRIPTION

The Intake Air Temperature (IAT) sensor, mounted on the air cleaner hose, monitors the IAT.

The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance decreases. The variations in resistance are communicated to the ECM as changes in voltage (see Fig. 1).

The IAT sensor is connected to the ECM (see below). The 5 V power source voltage in the ECM is applied to the IAT sensor from terminal THA via resistor R.

The resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes in accordance with changes in the IAT, the voltage at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve drive ability during cold engine operation.

DTC No. DTC Detection Condition Trouble Area
P0110/24

Open or short in IAT sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open or short in IAT sensor circuit

  • IAT sensor

  • ECM
P0112/24

Short in IAT sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open or short in IAT sensor circuit

  • IAT sensor

  • ECM
P0113/24

Open in IAT sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open or short in IAT sensor circuit

  • IAT sensor

  • ECM
Tip:

When DTC P0110/24, P0112/24 or P0113/24 is detected, check the intake air temperature by entering the following menus on the intelligent tester : Powertrain / Engine / Data List / Intake Air.

Temperature Displayed Malfunction
-40°C (-40°F) Open circuit
140°C (284°F) or more Short circuit
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).

Tip:

  • If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

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When using intelligent tester:

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PROCEDURE


  1. Click here

    READ VALUE USING INTAKE AIR TEMPERATURE SENSOR


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

    3. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    4. Read the values.

      OK
      Same value as the actual air temperature.
      Result
      Temperature Displayed Proceed to
      -40°C (-40°F) A
      140°C (284°F) or more B
      OK (same as air temperature near intake manifold) C
      Tip:

      • If there is an open circuit, the intelligent tester indicates -40°C (-40°F).

      • If there is a short circuit, the intelligent tester indicates 140°C (284°F) or more.


  2. Click here

    CHECK HARNESS AND CONNECTOR (OPEN IN WIRE HARNESS)


    1. A01BCH8E08

      Disconnect the A2 IAT sensor connector.

    2. Connect terminals 1 and 2 of the IAT sensor wire harness side connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the intelligent tester ON.

    5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    6. Read the values.

      OK
      140°C (284°F) or more

  3. Click here

    CHECK ECM (OPEN IN ECM)


    1. A01BAXIE01

      Disconnect the A2 IAT sensor connector.

    2. Connect terminals THA and E2 of the D1 ECM connector.

      Tip:

      Before checking, perform a visual and contact pressure check on the ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the intelligent tester ON.

    5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    6. Read the values.

      OK
      140°C (284°F) or more

  4. Click here

    CHECK HARNESS AND CONNECTOR (SHORT IN WIRE HARNESS)


    1. A01BCZFE03

      Disconnect the A2 IAT sensor.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch ON and turn the intelligent tester ON.

    4. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    5. Read the values.

      OK
      -40°C (-40°F)

  5. Click here

    CHECK ECM (SHORT IN ECM)


    1. A01BF0TE01

      Disconnect the A2 IAT sensor.

    2. Disconnect the D1 ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the intelligent tester ON.

    5. Enter the following menus: Powertrain / Engine / Data List / Intake Air.

    6. Read the values.

      OK
      -40°C (-40°F)

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    REPLACE ECM

  7. Click here

    CHECK FOR INTERMITTENT PROBLEMS

  8. Click here

    REPLACE INTAKE AIR TEMPERATURE SENSOR

  9. Click here

    REPAIR OR REPLACE HARNESS AND CONNECTOR

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When not using intelligent tester:

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PROCEDURE


  1. Click here

    CHECK ECM TERMINAL VOLTAGE (THA TERMINAL)


    1. A01BF68E02

      Start engine.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      D1-31 (THA) - D1-28 (E2) Idling, IAT at 20°C (68°F) 0.5 to 3.4 V

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    INSPECT INTAKE AIR TEMPERATURE SENSOR


    1. A01BI7AE05

      Remove the sensor.

    2. Measure the resistance of the sensor.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 2.21 to 2.69 kΩ
      Note:

      When checking the IAT sensor in water, keep the terminals dry. After the check, wipe the sensor dry.


  3. Click here

    CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)


    1. A01BARAE07

      Disconnect the D1 ECM connector.

    2. Disconnect the A2 sensor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      D1-31 (THA) - A2-2 Below 1 Ω
      D1-28 (E2) - A2-1 Below 1 Ω
      D1-31 (THA) or A2-2 - Body ground 10 kΩ or higher
      D1-28 (E2) or A2-1 - Body ground 10 kΩ or higher

  4. Click here

    REPLACE ECM

  5. Click here

    CHECK FOR INTERMITTENT PROBLEMS

  6. Click here

    REPLACE INTAKE AIR TEMPERATURE SENSOR

  7. Click here

    REPAIR OR REPLACE HARNESS AND CONNECTOR