Overheating when sitting and idling, code P0115

Good afternoon,

I attached the flow chart for the 115 below that gives you the values for the temperature sensor.

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

This is a TSB which means it was a very common issue for this vehicle with many complaining of this issue. The most common failure is the temp sensor itself.

The 116 is or has the same conditions for setting the code.

Roy

INSPECTION PROCEDURE

HINT:
If DTCs P0115 and P0116 are output simultaneously, engine coolant temperature sensor circuit may be open. Perform troubleshooting of DTC P0115 first.
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

INSPECTION PROCEDURE

HINT:
If DTCs P0110, P0115 and P0120 are output simultaneously, E2 (sensor ground) may be open.
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

It could be a bad thermostat not opening.

https://www.2carpros.com/articles/replace-thermostat

https://www.2carpros.com/articles/how-an-engine-thermostat-works

What temperature thermostat did you get when you replaced it?

Roy

3. REMOVE THERMOSTAT
a) Remove the 3 nuts, water inlet and thermostat with gasket from the water pump.
b) Remove the gasket from the thermostat.