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ECD SYSTEM (w/ DPF), Diagnostic DTC:P0115, P0117, P0118

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

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

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

Tip:

If DTC P0115, P0117 or P0118 is stored, the ECM operates the fail-safe function in which the engine coolant temperature is assumed to be 80°C (176°F).

Table 1. P0115
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 0.5 seconds 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
Table 2. P0117
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 0.5 seconds 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
Table 3. P0118
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 0.5 seconds 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
Table 4. Related Data List
DTC No. Data List
P0115 Coolant Temp
P0117
P0118
Tip:

  • If DTC P0115, P0117 and/or P0118 is stored, the following symptoms may appear:


    • Misfire

    • Combustion noise

    • Black smoke

    • White smoke

    • Lack of power

  • When DTC P0115, P0117 and/or P0118 is stored, check the engine coolant temperature by entering the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

    Table 5. Reference
    Temperature Displayed Malfunction
    -40°C (-40°F) Open circuit
    140°C (284°F) or higher Short circuit
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).

  • After replacing the fuel supply pump assembly, the ECM needs initialization (Click here).

  • After replacing an injector assembly, the ECM needs registration (See PageClick here).

Tip:

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, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

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

    4. Read the value.

      OK
      70 to 90°C (158 to 194°F) with warm engine
      Table 6. Result
      Result Proceed to
      -40°C (-40°F) A
      140°C (284°F) or higher B
      70 to 90°C (158 to 194°F) C
      Tip:

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

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


  2. Click here

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


    1. A01DT8DE02

      Disconnect the engine coolant temperature sensor connector.

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

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG) and turn the tester on.

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

    6. Read the value.

      OK
      140°C (284°F) or higher
      Table 7. Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM
      *a

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

    7. Reconnect the engine coolant temperature sensor connector.


  3. Click here

    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
      C24-2 - C90-5 (THW) Always Below 1 Ω
      C24-1 - C90-11 (ETHW) Always Below 1 Ω

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


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


    1. A01DQ92E06

      Disconnect the engine coolant temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and turn the tester on.

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

    5. Read the value.

      OK
      -40°C (-40°F)
      Table 8. Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2 ECM

    6. Reconnect the engine coolant temperature sensor connector.


  5. Click here

    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
      C24-2 or C90-5 (THW) - Body ground Always 10 kΩ or higher

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


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    REPLACE ECM


    1. Replace the ECM (Click here).


  7. Click here

    CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR.


    1. Replace the engine coolant temperature sensor (Click here).


  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


  9. Click here

    CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM.


    1. Replace the ECM (Click here).


  10. Click here

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR


    1. Replace the engine coolant temperature sensor (Click here).


  11. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the engine switch on (IG) for 1 second.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Confirm that the DTC is not output again.


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    END