Hyundai Santa Fe: Engine Control System / 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 whose resistance changes 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...

Engine Coolant Temperature Sensor (ECTS). Specifications

Specification Temperature [°C (°F)] Resistance (kΩ) -40 (-40) 41.74 - 54.54 -30 (-22) 23...

Other information:

Hyundai Santa Fe (TM) 2019-2025 Service Manual: Auto Defogging Sensor. Repair procedures

Inspection To inspect and diagnose the sensor, refer to Self-Diagnosis procedure and DTC guide. Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the rain sensor inner cover (A) and rain sensor cover (B)...

Hyundai Santa Fe (TM) 2019-2025 Service Manual: General safety information and caution

General Safety Information and Caution 1. Be careful when driving the vehicle using the smart cruise control system as follows. (1) On curves or inclines/declines • The smart cruise control system may have limits to detect distance to the vehicle ahead due to road and traffic conditions...