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 are the same as those of the Intake Air Temperature (IAT) sensor.

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