СИСТЕМА ECD, Diagnostic DTC:P1115

DTC Code DTC Name
P1115 Coolant Temperature Sensor Circuit for Coolant Heat Storage System / Intake Air Temperature Circuit

DESCRIPTION

The intake air temperature sensor senses the intake air temperature. A thermistor built in this sensor changes the resistance value according to the intake air temperature as shown in the illustration. This resistance value of intake air temperature sensor is one of the factors used to decide the fuel injection volume.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P1115 Coolant Temperature Sensor Circuit for Coolant Heat Storage System / Intake Air Temperature Circuit Open or short in intake air temperature sensor circuit for 0.5 seconds or more.

  • Open or short in intake air temperature sensor circuit

  • Intake air temperature sensor

  • ECM

 - DTCstored

WIRING DIAGRAM

A01SDFIE02
*a Intake Air Temperature Sensor

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING GTS (INTAKE AIR TEMPERATURE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

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


      Powertrain > Engine > Data List
      Tester Display
      Intake Air

    4. Read the value.

      Result
      Display Proceed to
      -40°C (-40°F) A
      140°C (284°F) or more B
      The same as actual engine coolant temperature C

      Tech Tips


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

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


    B

    CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN)


    1. A01SDNAC02
      *1 Intake Air Temperature Sensor
      *2 ECM
      *a

      Front view of wire harness connector

      (to Intake Air Temperature Sensor)

      Disconnect the intake air temperature sensor connector.

    2. Connect terminals 1 and 2 of the intake air temperature sensor harness side connector.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON and turn the GTS on.

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


      Powertrain > Engine > Data List
      Tester Display
      Intake Air

    6. Read the value.

      OK
      140°C (284°F) or more
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    NG

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


    1. Disconnect the intake air temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in thetable below.

      Standard resistance
      Tester Connection Condition Specified Condition
      A54-2 - C128-22 (THA) Always Below 1 Ω
      A54-1 - C128-30 (ETHA) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)


    1. A01SCCTC01
      *1 Intake Air Temperature Sensor
      *2 ECM

      Disconnect the intake air temperature sensor connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON and turn the GTS on.

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


      Powertrain > Engine > Data List
      Tester Display
      Intake Air

    5. Read the value.

      OK
      -40°C (-40°F) or more
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INTAKE AIR TEMPERATURE SENSOR Click here

    NG

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


    1. Disconnect the intake air temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      A54-2 or C128-22 (THA) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR