Hyundai Genesis (DH): 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.ion duration and controls the ignition timing using the
information of engine coolant temperature to avoid engine stalling and
improve drivability.
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.

Inspection
1.
Connect the GDS on the Data Link Connector (DLC).
2.
Measure the output voltage of the MAPS at idle and with ignition ON.
ConditionOutput Voltage (V)IG ONApprox.
Specification
TemperatureResistance (k?)
Other information:
D
Component Location
Components
1. Seal2. Intake Duct Case3. Intake Door4. Intake Actuator5. Intake Duct Case (A)6. Climate Control Air Filter7. Climate Control Air Filter Cover8. Cluster Ionizer9. Blower Upper Case10. Blower Lower Case11. Power Mosfet12.