ECD SYSTEM, Diagnostic DTC:P0115/22, P0117/22, P0118/22

DTC Code DTC Name
P0115/22 Engine Coolant Temperature Circuit
P0117/22 Engine Coolant Temperature Circuit Low Input
P0118/22 Engine Coolant Temperature Circuit High Input

DESCRIPTION

A thermistor is built in the Engine Coolant Temperature (ECT) sensor and changes the resistance value according to the engine coolant temperature.

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

Tech Tips

If the ECM detects the DTC P0115/22, P0117/22 or P0118/22, it operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).

DTC No. DTC Detection Condition Trouble Area
P0115/22

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

P0117/22

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

P0118/22

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 P0115/22, P0117/22 and/or P0118/22 is detected, check the engine coolant temperature by entering the following menus on the intelligent tester : Powertrain / Engine / Data List / Coolant Temp.

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

WIRING DIAGRAM

A01BB6IE50

INSPECTION PROCEDURE

Note

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

Tech Tips


  • If 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. 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 running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

When using intelligent tester:

PROCEDURE


  1. READ VALUE USING ENGINE COOLANT TEMPERATURE SENSOR


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Read the values.

      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
    C
    A
  2. CHECK HARNESS AND CONNECTOR (OPEN IN WIRE HARNESS)


    1. A01BG0OE01

      Disconnect the D32 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 intelligent tester ON.

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

    6. Read the values.

      Standard
      140°C (284°F) or more

    OK
    NG
  3. CHECK ECM (OPEN IN ECM)


    1. A01BAXIE04

      Disconnect the D32 ECT sensor connector.

    2. Connect terminals THW and E2 of the D1 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 intelligent tester ON.

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

    6. Read the values.

      Standard
      140°C (284°F) or more

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


    1. A01BHSEE01

      Disconnect the D32 ECT sensor connector.

    2. Connect the intelligent tester to the DLC3.

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

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

    5. Read the values.

      Standard
      -40°C (-40°F)

    OK
    NG
  5. CHECK ECM (SHORT IN ECM)


    1. A01BF0TE02

      Disconnect the D32 ECT sensor connector.

    2. Disconnect the D1 ECM connector.

    3. Connect the intelligent tester to the DLC3.

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

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

    6. Read the values.

      Standard
      -40°C (-40°F)

    OK
    NG

When not using intelligent tester:

PROCEDURE


  1. CHECK ECM TERMINAL VOLTAGE (THW TERMINAL)


    1. A01BF68E05

      Start the engine.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      D1-19 (THW) - D1-28 (E2) Idling, Engine coolant temperature between 60°C and 120°C (140°F and 248°F) 0.2 to 1.0 V

    OK
    NG
  2. INSPECT ENGINE COOLANT TEMPERATURE SENSOR


    1. A01BEDVE07

      Remove the sensor.

    2. Measure the resistance of the sensor.

      Standard resistance
      Connection Specified Condition
      20°C (68°F) 2.32 to 2.59 kΩ
      80°C (176°F) 0.310 to 0.326 kΩ

      Note

      When checking the ECT sensor in water, keep the terminals dry. After the check, wipe the sensor dry.

      Tech Tips

      Alternative procedure: Connect an ohmmeter to the installed ECT sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values against the resistance/ temperature graph. Change the engine temperature (warm up or cool down) and repeat the test.


    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR)


    1. A01BAYFE01

      Disconnect the D1 ECM connector.

    2. Disconnect the D32 sensor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      D1-19 (THW) - D32-2 Below 1 Ω
      D1-28 (E2) - D32-1 Below 1 Ω
      D1-19 (THW) or D32-2 - Body ground 10 kΩ or higher
      D1-28 (E2) or D32-1 - Body ground 10 kΩ or higher

    NG
    OK