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

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

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.

A01BBBAE03
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

Tech Tips

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

WIRING DIAGRAM

A01BB6IE01

INSPECTION PROCEDURE

Note

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

Tech Tips


  • 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.

When using intelligent tester:

PROCEDURE


  1. 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

      Tech Tips


      • 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.


    B

    CHECK HARNESS AND CONNECTOR (SHORT IN WIRE HARNESS) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS

    A

  2. CHECK HARNESS AND CONNECTOR (OPEN IN WIRE HARNESS)


    1. A01BCH8E01

      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

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR

    NG

  3. CHECK ECM (OPEN IN ECM)


    1. A01BAXIE01

      Disconnect the A2 IAT sensor connector.

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

      Tech Tips

      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

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    NG

    REPLACE ECM

  4. 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)

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR

    NG

  5. 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)

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    NG

    REPLACE ECM

When not using intelligent tester:

PROCEDURE


  1. 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

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. 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.


    NG

    REPLACE INTAKE AIR TEMPERATURE SENSOR

    OK

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


    1. A01BARAE01

      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 (THA) Below 1 Ω
      D1-28 (E2) - A2-1 (E2) Below 1 Ω
      D1-31 (THA) or A2-2 (THA) - Body ground 10 kΩ or higher
      D1-28 (E2) or A2-1 (E2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM