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 structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.

Tech Tips

When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No. DTC Detection Condition Trouble Area
P0115

Open or short in 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

Short in 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

Open in 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 by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Coolant Temp.

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

WIRING DIAGRAM

A005SJ4E19

INSPECTION PROCEDURE

Tech Tips

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 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 and turn the tester on.

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

    4. Read the value displayed on the tester.

      Standard
      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) or higher 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) or higher.


    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. A005U09E01
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM
      *3

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

      Confirm good connection at the engine coolant temperature sensor.

    2. Disconnect the engine coolant temperature sensor connector.

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

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to ON and turn the tester on.

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

    7. Read the value displayed on the tester.

      Standard
      140°C (284°F) or higher.

    8. Reconnect the engine coolant temperature sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Click here

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

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


    1. A005WEXE50
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      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.


    NG

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

    OK

    REPLACE ECM Click here

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


    1. A005V8QE02
      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 and 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
      -40°C (-40°F)

    6. Reconnect the engine coolant temperature sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Click here

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

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


    1. A005WEXE51
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)
      *2

      Front view of wire harness connector

      (to ECM)

      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.


    NG

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

    OK

    REPLACE ECM Click here