ECD SYSTEM (w/ EGR Cooler), 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 (ECT) 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 the intake air temperature sensor.

DTC No. DTC Detection Condition Trouble Area
P0115

Open or short in ECT sensor circuit for 0.5 seconds

(1 trip detection logic)

  • Open or short in ECT sensor circuit

  • ECT sensor

  • ECM
P0117

Short in ECT sensor circuit for 0.5 seconds

(sensor resistance value less than 79 Ω)

(1 trip detection logic)

  • Open or short in ECT sensor circuit

  • ECT sensor

  • ECM
P0118

Open in ECT sensor circuit for 0.5 seconds

(sensor resistance value more than 156 kΩ)

(1 trip detection logic)

  • Open or short in ECT sensor circuit

  • ECT sensor

  • ECM

Tech Tips

When DTC P0115, P0117 and/or P0118 is detected, check the engine coolant temperature by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Coolant Temp.

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

WIRING DIAGRAM

A01E2Z1E26

INSPECTION PROCEDURE

Note

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

Tech Tips


  • If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

  • 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.

PROCEDURE


  1. READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the tester ON.

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

    4. Read the value.

      OK
      75 to 95°C (167 to 203°F) after warming up the engine.
      Result
      Temperature Displayed Proceed to
      -40°C (-40°F) A
      140°C (284°F) or more B
      OK (Same as actual engine coolant temperature) 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 more.


    B

    CHECK HARNESS AND CONNECTOR (SHORT IN WIRE HARNESS) Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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


    1. A01E1JAE18

      Disconnect the W1 ECT sensor connector.

    2. Connect terminals 1 and 2 of the ECT sensor wire harness side connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the tester ON.

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

    6. Read the value.

      Standard
      140°C (284°F)

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

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


    1. A01DWEXE44

      Disconnect the W1 ECT sensor connector.

    2. Connect terminals THW and E2 of the E8 ECM connector.

      Tech Tips

      Before checking, perform a visual and contact pressure check on the ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the tester ON.

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

    6. Read the value.

      Standard
      140°C (284°F)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM Click here

  4. CHECK HARNESS AND CONNECTOR (SHORT IN WIRE HARNESS)


    1. A01E1WWE43

      Disconnect the W1 ECT sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch ON and turn the tester ON.

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

    5. Read the value.

      Standard
      -40°C (-40°F)

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

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


    1. A01DZBDE32

      Disconnect the W1 ECT sensor connector.

    2. Disconnect the E8 ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch ON and turn the tester ON.

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

    6. Read the value.

      Standard
      -40°C (-40°F)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE ECM Click here