Description and Operation: Description

• Engine Coolant Temperature Sensor (ECTS) detects the engine coolant temperature.
• The thermistor of ECTS has a characteristic of Negative Temperature Coefficient (NTC), which means temperature and resistance are inversely proportional to each other.
• The reference +5 V is supplied to the ECTS via a resistor in the Engine Control Module (ECM). That is, the resistor in the ECM and the thermistor in the ECTS are connected in series.
• To prevent the engine stop or hesitation during the cold start, the ECM calibrates the fuel injection amount and the injection timing based on the engine coolant temperature information.

Courtesy of KIA MOTORS AMERICA, INC.