SFI SYSTEM, Diagnostic DTC:P0115, P0117, P0118

DTC Code DTC Name
P0115 Engine Coolant Temperature Circuit Malfunction
P0117 Engine Coolant Temperature Circuit Low Input
P0118 Engine Coolant Temperature Circuit High Input

DESCRIPTION

A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The connection between the engine coolant temperature sensor and the ECM is the same as that of the intake air temperature sensor.

DTC No. DTC Detection Condition Trouble Area
P0115 An open or short in the engine coolant temperature sensor circuit for 0.5 seconds (1-trip detection logic).

  • Open or short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM
P0117 A short in the engine coolant temperature sensor circuit for 0.5 seconds (1-trip detection logic).

  • Short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM
P0118 An open in the engine coolant temperature sensor circuit for 0.5 seconds (1-trip detection logic).

  • Open in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM

Tech Tips

When any of these DTCs are output, check the engine coolant temperature using the intelligent tester. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

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

WIRING DIAGRAM

A0058E2E02
*a Engine Coolant Temperature Sensor

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the intelligent tester. 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, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    5. Read the value displayed on the tester.

      Standard value
      Between 80°C and 100°C (176°F and 212°F) with warm engine.
      Result
      Result Proceed to
      Temperature displayed is -40°C (-40°F) A
      Temperature displayed is 140°C (284°F) B
      Temperature displayed is between 80°C and 100°C (176°F and 212°F) 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).


    B

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

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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


    1. A00578CE02
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM
      *3

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

      Confirm a good connection at the engine coolant temperature sensor.

    2. Disconnect the engine coolant temperature sensor connector.

    3. Connect terminals 1 and 2 of the wire harness connector for the engine coolant temperature sensor.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to ON.

    6. Turn the tester on.

    7. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    8. Read the value displayed on the tester.

      Standard value
      140°C (284°F)

    9. Reconnect the engine coolant temperature sensor connector.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    1. Disconnect the engine coolant 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
      B3-2 - B39-64 (THW) Always Below 1 Ω
      B3-1 - B39-65 (ETHW) Always Below 1 Ω

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

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


    1. A0056AYE17
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM

      Disconnect the engine coolant temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    6. Read the value displayed on the tester.

      Standard value
      -40°C (-40°F)

    7. Reconnect the engine coolant temperature sensor connector.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

  5. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    1. Disconnect the engine coolant 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
      B3-2 or B39-64 (THW) - Body ground Always 10 kΩ or higher

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)