Hyundai Veloster: Engine Coolant Temperature Sensor (ECTS). Description and Operation

Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage of the cylinder head for detecting the engine coolant temperature. The ECTS uses a thermistor that changes resistance with the temperature.

The electrical resistance of the ECTS decreases as the temperature increases, and increases as the temperature decreases. The reference +5V is supplied to the ECTS via 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 value of the thermistor in the ECTS changes according to the engine coolant temperature, the output voltage also changes.

During cold engine operation, the ECM increases the fuel injection duration and controls the ignition timing using the information of engine coolant temperature to avoid engine stalling and improve drivability.

Intake Air Temperature Sensor (IATS). Repair procedures

Inspection 1. Turn the ignition switch OFF. 2. Disconnect the IATS connector. 3. Measure resistance between th ...

Engine Coolant Temperature Sensor (ECTS). Specifications

Specification Temperature Resistance (kΩ) °C °F -40 -40 48.14 -20 -4 ...

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Repair procedures
Troubleshooting Starter Circuit The battery must be in good condition and fully charged. 1. Remove ...

Schematic Diagrams
Circuit Diagram (1) Circuit Diagram (2) SRSCM Connector terminal Pin Function (Connector A) Pin Function (Connector B) ...

Warnings and indicators
All warning lights are checked by turning the ignition switch ON (do not start the engine). Any light that does not illuminate should be checked by an authorized HYUNDAI dealer. After starting th ...