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 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.

P0116
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Drive the vehicle so that the vehicle accelerates by 30 km/h (19 mph) or higher 10 times repeatedly.

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

  • Open or short in engine coolant temperature sensor circuit

  • ECM

  • Thermostat

If the engine coolant temperature was more than 60°C (140°F) at engine start, and conditions (a) and (b) are met (6 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 ON.

    4. Turn the tester on.

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

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC P0116 is output A
      DTC 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. 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 Click here

    OK

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


    1. Disconnect the engine coolant temperature sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      W7-1 - E35-9 (THW) Always Below 1 Ω
      W7-2 - E36-14 (E2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      W7-1 or E35-9 (THW) - Body ground Always 10 kΩ or higher
      W7-2 or E36-14 (E2) - 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

    OK

  4. INSPECT ENGINE COOLANT TEMPERATURE SENSOR


    1. Inspect the engine coolant temperature sensor Click here.


    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

    REPLACE ECM