DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem: Description

A thermistor is built into the Engine Coolant Temperature (ECT) sensor, of which the resistance value varies according to the ECT.

The structure of the sensor and its connection to the ECM (Included in HV control ECU) are the same as those of the Intake Air Temperature (IAT) sensor.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0116	When either of following conditions is met (2 trip detection logic): When cold engine is started and engine is warmed up, Engine Coolant Temperature (ECT) sensor value does not change. After engine is warmed up, ECT sensor value does not change when engine stopped and then next cold engine start is performed.	Thermostat ECT sensor