ECD SYSTEM, Diagnostic DTC:P0117, P0118

DTC Code DTC Name
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.

Tech Tips


  • When the engine coolant temperature sensor output is outside the normal range, the ECM determines that this is a malfunction.

  • If DTC P0117 or P0118 is detected, the ECM performs engine control using an estimated engine coolant temperature calculated from the intake air temperature and the intake air volume at the time of engine start.

P0117
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine idles for approximately 15 seconds

Engine coolant temperature sensor output is more than 120°C (248°F).

(1 trip detection logic.)

  • Short in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM
P0118
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine idles for approximately 15 seconds

Engine coolant temperature sensor output is less than -30°C (-22°F).

(1 trip detection logic.)

  • Open in engine coolant temperature sensor circuit

  • Engine coolant temperature sensor

  • ECM
Related Data List
DTC No. Data List
P0117

  • Coolant Temp
P0118

Tech Tips


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


    • Misfire

    • Combustion noise

    • Black smoke

    • White smoke

    • Lack of power

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

Reference
Temperature Displayed Malfunction
-30°C (-22°F) Open circuit
120°C (248°F) Short circuit

WIRING DIAGRAM

A011AA7E02

INSPECTION PROCEDURE

Note


  • When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • 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 USING INTELLIGENT TESTER (COOLANT TEMP)


    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.

      Standard
      80 to 100°C (176 to 212°F) with warm engine.
      Result
      Result Proceed to
      -30°C (-22°F) A
      120°C (248°F) or higher B
      Between 80 to 100°C (176 to 212°F) C

      Tech Tips


      • If there is an open circuit, the intelligent tester indicates -30°C (-22°F).

      • If there is a short circuit, the intelligent tester indicates 120°C (248°F) or higher.


    B

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

    C

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

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


    1. Disconnect the engine coolant temperature sensor connector.

    2. A0117T8E01
      Text in Illustration
      *1 Engine Coolant Temperature Sensor
      *2

      Front view of wire harness connector

      (to Engine Coolant Temperature Sensor)

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

    3. Connect the intelligent tester to the DLC3.

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

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

    6. Read the value.

      Standard
      120°C (248°F) or higher

    7. Reconnect the engine coolant temperature sensor connector.


    OK

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

    NG

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

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


    1. Disconnect the engine coolant temperature sensor connector.

    2. A0117A1E01
      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 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B38-2 - B9-40 (THW) Always Below 1 Ω
      B38-1 - B9-39 (ETHW) Always Below 1 Ω

    4. Reconnect the engine coolant temperature sensor connector.

    5. Reconnect the ECM connector.


    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

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


    1. Disconnect the engine coolant temperature sensor connector.

    2. A011BN0E02
      Text in Illustration
      *1 Engine Coolant Temperature Sensor

      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.

      Standard
      -30°C (-22°F)

    6. Reconnect the engine coolant temperature sensor connector.


    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

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

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


    1. Disconnect the engine coolant temperature sensor connector.

    2. A0117A1E02
      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 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B38-2 or B9-40 (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 Click here

    OK

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. Replace the engine coolant temperature sensor Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPLACE ENGINE COOLANT TEMPERATURE SENSOR


    1. Replace the engine coolant temperature sensor Click here.


    NEXT

  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Allow the engine to idle for 15 seconds or more.

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

    6. Confirm that the DTC is not output again.


    NEXT

    END