ECD SYSTEM, Diagnostic DTC:P0116

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

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
P0116

If the engine coolant temperature was between -40°C (-40°F) and 60°C (140°F) at engine start, and conditions (a) and (b) are met:

(2-trip detection logic)

(a) Vehicle is driven at varying speeds (accelerating and decelerating)

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

 Engine coolant temperature sensor

If the engine coolant temperature was more than 60°C (140°F) at engine start, and conditions (a) and (b) are met:

(2-trip detection logic)

(a) Vehicle is driven at varying speeds (accelerating and decelerating)

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

INSPECTION PROCEDURE

Tech Tips

If DTCs P0115, P0116, P0117, and P0118 are output simultaneously, the engine coolant temperature sensor circuit may be open or shorted. Perform troubleshooting for those DTCs first.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to the ON position.

    4. Turn the tester on.

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

    6. Read the DTCs.

      Result
      Display (DTC output) Proceed to
      P0116 A
      P0116 and other DTCs B

    B

    GO TO DTC CHART

    A

  2. INSPECT THERMOSTAT


    1. Remove the thermostat Click here.

    2. Check the valve opening temperature of the thermostat Click here.

      Standard
      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.


    NG

    REPLACE THERMOSTAT

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR