Hyundai Sonata LF Quiz
Engine Control System/Fuel System

Engine Coolant Temperature (ECT) Sensor Description and Operation

In this manual: Engine Control System/Fuel System
General Information — 9Engine Mechanical System — 90Engine Electrical System — 58Emission Control System — 24Engine Control System/Fuel System — 114Drive Shaft and Axle — 15Suspension System — 35Steering — 19Restraints — 50Brake System — 54Body (Interior and Exterior) — 213Body Electrical System — 241Heating, Ventilation, and Air Conditioning — 56DCT (Dual Clutch Transmission) System — 52
~1min read

Description

The Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage in the cylinder head to detect engine coolant temperature. The ECTS uses a thermistor whose electrical resistance changes with temperature. The resistance of the ECTS decreases as temperature increases, and increases as temperature decreases. A reference +5V is supplied to the ECTS through a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the resistance of the thermistor in the ECTS changes according to engine coolant temperature, the output voltage also changes. When the engine is cold, the ECM increases fuel injection duration and adjusts ignition timing using engine coolant temperature information to prevent engine stalling and improve drivability.

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