ECD SYSTEM, Diagnostic DTC:P0116

DTC Code DTC Name
P0116 Engine Coolant Temperature Circuit Range / Performance

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.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0116 Engine Coolant Temperature Circuit Range / Performance

Condition 1:


  • The engine coolant temperature is between -40°C (-40°F) and 60°C (140°F) at engine start, and conditions (a) and (b) are met (2 trip detection logic):


    1. Vehicle is driven at varying speeds (accelerating and decelerating) for 600 seconds.

    2. Engine coolant temperature remains within 3°C (5.4°F) of the engine starting temperature.

Condition 2:


  • The engine coolant temperature is higher than 60°C (140°F) at engine start, and conditions (a) and (b) are met (6 trip detection logic):


    1. Vehicle is driven at varying speeds (accelerating and decelerating) for 600 seconds.

    2. Engine coolant temperature remains within 1°C (1.8°F) of the engine starting temperature.

  • Thermostat

  • Engine coolant temperature sensor

 Comes on DTC stored
Related Data List
DTC No. Data List
P0116 Coolant Temp

Tech Tips


  • If DTC P0116 is stored, the following symptoms may appear:


    • Misfire

    • Combustion noise

    • Black smoke

    • White smoke

    • Lack of power

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P0116

Condition 1:

City driving for 10 minutes or more after engine start with engine coolant temperature between -40°C (-40°F) and 60°C (140°F)

Condition 2:

City driving for 10 minutes or more after engine start with engine coolant temperature higher than 60°C (140°F)

MONITOR DESCRIPTION

The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor that varies its resistance depending on the temperature of the engine coolant. When the coolant temperature is low, the resistance of the thermistor increases.

When the sensor voltage output varies slightly, the ECM interprets this as afault in the engine coolant temperature sensor and sets a DTC.

Examples:


  1. Upon starting the engine, the engine coolant temperature is between -40°C (-40°F) and 60°C (140°F). If, after driving for a few minutes, the engine coolant temperature still remains within 3°C (5.4°F) of the starting temperature, a DTC is stored (2 trip detection logic).

  2. Upon starting the engine, the engine coolant temperature is more than 60°C (140°F). If, after driving for a few minutes, the engine coolant temperature still remains within 1°C (1.8°F) of the starting temperature, a DTC is stored (6 trip detection logic).

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. 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. CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    4. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      P0116 is output A
      P0116 and other DTCs are output B

    B

    GO TO DTC CHART Click here

    A

  2. INSPECT THERMOSTAT


    1. Remove the thermostat.

      Click here

    2. Measure the valve opening temperature of the thermostat.

      Standard opening temperature
      80 to 84°C (176 to 183°F)

      Tech Tips

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

    3. Reinstall the thermostat.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE THERMOSTAT Click here

    OK

  3. REPLACE ENGINE COOLANT TEMPERATURE SENSOR


    1. Replace the engine coolant temperature sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

    4. Check that the engine coolant temperature is 60°C (140°F) or less.

    5. Start the engine.

    6. Drive the vehicle for a total of 10 minutes or more.

    7. Check that the engine coolant temperature changes by 1°C (1.8°F) or more.

      Result
      Proceed to
      NEXT

    NEXT

    END

  5. REPLACE THERMOSTAT


    1. Replace the thermostat.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 4 Click here