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.

P0116
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
With the engine coolant temperature below 60°C (140°F), start the engine and idle it for 5 minutes. Then drive the vehicle at a speed of 40 km/h (25 mph) or more for a total of 5 minutes or more and check that the engine coolant temperature changes by 1°C (1.8°F) or more.	When engine is started cold and warmed up, the engine coolant temperature sensor value does not change (2 trip detection logic).	Thermostat Engine coolant temperature sensor
	After the warmed up engine is stopped and the next cold engine start is performed, the engine coolant temperature sensor value does not change (2 trip detection logic)	Thermostat Engine coolant temperature sensor

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

MONITOR DESCRIPTION

Engine coolant temperature sensor cold start monitor
When a cold engine start is performed and then the engine is warmed up, if the engine coolant temperature sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.

Engine coolant temperature sensor soak monitor
If the engine coolant temperature sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.

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

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

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

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.
NG
REPLACE THERMOSTAT Click here

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
REPLACE THERMOSTAT
1. Replace the thermostat Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
1. Connect the GTS to the DLC3.
2. Turn the engine switch on (IG) and turn the GTS on.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
4. Start the engine.
5. Run the engine at 2500 rpm with no load.
6. Check that "Coolant Temp" changes by 1°C (1.8°F) or more within 10 minutes while idling the engine.
NEXT
END

ECD SYSTEM, Diagnostic DTC:P0116