ECD SYSTEM, Diagnostic DTC:P0115, P0117, P0118

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

DESCRIPTION

A thermistor is built into the engine coolant temperature sensor and changes its resistance value according to the engine coolant temperature.

The structure of the sensor and connection to the ECM is the same as the intake air temperature sensor.

DTC No. Proceed to DTC Detection Condition Trouble Area
P0115 Step 1 Open or short in engine coolant temperature sensor circuit for 0.5 seconds

  • Open or short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM
P0117 Step 4 Short in engine coolant temperature sensor circuit for 0.5 seconds

  • Open or short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM
P0118 Step 2 Open in engine coolant temperature sensor circuit for 0.5 seconds

  • Open or short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM

Tech Tips

When DTC P0115, P0117 and/or P0118 are detected, check the engine coolant temperature by entering the following menus on the tester: 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

A01CJ1QE06

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 moving or stationary, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (COOLANT 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 ON.

    4. Turn the tester on.

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

      Standard
      Same value as the actual engine coolant temperature.
      Result
      Temperature Display Proceed to
      -40°C (-40°F) A
      140°C (284°F) B
      OK (same as the actual engine coolant temperature sensor) 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. A01CGPZE05
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM
      *3

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

      Disconnect the engine coolant temperature sensor connector.

    2. Connect terminals 1 and 2 of the engine coolant temperature sensor wire harness side 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 ON.

    6. Turn the tester on.

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

    8. Read the value.

      Standard
      140°C (284°F)

    9. Reconnect the engine coolant temperature sensor connector.


    NG

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

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

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


    1. A01CHT9E18
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM
      *3

      Component with harness connected

      (ECM)

      Disconnect the engine coolant temperature sensor connector.

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

      Tech Tips

      Before checking, perform a visual and contact pressure check for 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 ON.

    6. Turn the tester on.

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

    8. Read the value.

      Standard
      140°C (284°F)

    9. Reconnect the engine coolant temperature sensor connector.


    NG

    REPLACE ECM Click here

    OK

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

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


    1. A01CHI7E31
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM

      Disconnect the engine coolant temperature sensor 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 ON.

    5. Turn the tester on.

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

    7. Read the value.

      Standard
      -40°C (-40°F)

    8. Reconnect the engine coolant temperature sensor connector.


    NG

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

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

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


    1. A01CH2EE16
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM
      *3

      Rear view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Disconnect the engine coolant temperature sensor 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 ON.

    6. Turn the tester on.

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

    8. Read the value.

      Standard
      -40°C (-40°F)

    9. Reconnect the engine coolant temperature sensor connector.

    10. Reconnect the ECM connector.


    NG

    REPLACE ECM Click here

    OK

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