ECD SYSTEM, Diagnostic DTC:P0110, P0112, P0113

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

DESCRIPTION

The Intake Air Temperature (IAT) sensor is built into the Mass Air Flow (MAF) meter and senses the atmospheric temperature. A thermistor built in the sensor changes the resistance value according to the intake air temperature. The lower the atmospheric temperature is, the greater the thermistor resistance value is, and the higher the atmospheric temperature is, the lower the thermistor resistance value is (see Fig. 1).

The IAT sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the IAT sensor from terminal THA via a 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 driveability during cold engine operation.

A01CJAME06
DTC No. Proceed to DTC Detection Condition Trouble Area
P0110 Step 1 Open or short in IAT sensor circuit for 0.5 seconds

  • Open or short in IAT sensor circuit

  • IAT sensor (built in MAF meter)

  • ECM
P0112 Step 4 Short in intake IAT sensor circuit for 0.5 seconds

  • Open or short in IAT sensor circuit

  • IAT sensor (built in MAF meter)

  • ECM
P0113 Step 2 Open in IAT sensor circuit for 0.5 seconds

  • Open or short in IAT sensor circuit

  • IAT sensor (built in MAF meter)

  • ECM

Tech Tips

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

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

WIRING DIAGRAM

A01CGTHE08

INSPECTION PROCEDURE

Tech Tips


  • If DTCs that are related to different systems are output simultaneously while terminal E2 is used as a ground terminal, 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to the ON position.

    4. Turn the tester on.

    5. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    6. Read the value.

      Standard
      Same value as the actual inlet air temperature.
      Result
      Temperature Display 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

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS

    A

  2. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    1. A01CJ2RE01

      Disconnect the MAF meter connector.

    2. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    3. Connect terminals 4 and 5 of the MAF meter wire harness side connector.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to the ON position.

    6. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    7. Read the value.

      Standard
      140°C (284°F) or more

    8. Reconnect the MAF meter connector.


    NG

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM) Click here

    OK

    REPLACE MASS AIR FLOW METER

  3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)


    1. A01CHB1E01

      Disconnect the MAF meter connector.

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

      Tech Tips

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

    3. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to the ON position.

    6. Turn the tester on.

    7. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    8. Read the value.

      Standard
      140°C (284°F) or more

    9. Reconnect the MAF meter connector.


    NG

    REPLACE ECM

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - MASS AIR FLOW METER)

  4. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    1. A01CGKRE39

      Disconnect the MAF meter connector.

    2. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

    6. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    7. Read the value.

      Standard
      -40°C (-40°F)

    8. Reconnect the MAF meter connector.


    NG

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM) Click here

    OK

    REPLACE MASS AIR FLOW METER

  5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)


    1. A01CGWVE01

      Disconnect the MAF meter connector.

    2. Disconnect the ECM connector.

    3. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to the ON position.

    6. Turn the tester on.

    7. Enter the following menu items: Powertrain / Engine and ECT / Data List / Intake Air.

    8. Read the value.

      Standard
      -40°C (-40°F)

    9. Reconnect the MAF meter connector.

    10. Reconnect the ECM connector.


    NG

    REPLACE ECM

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - MASS AIR FLOW METER)