Kia Optima Hybrid: Engine Control System / Engine Coolant Temperature Sensor (ECTS) Description and Operation

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Engine Control/Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS) Description and Operation

Description

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. Measure resistance between the IATS terminals 3 and 4. 4. Check that the resistance is within the specification. Temperature ...

Engine Coolant Temperature Sensor (ECTS) Specifications

Specification TemperatureResistance (k?)°C°F-40-4048.14-20-414.13 ~ 16.830325.7920682.31 ~ 2.59401041.15601400.59801760.32 ...

Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Canister Close Valve (CCV) Specifications

Specification ItemSpecificationCoil Resistance (?)19.8 ~ 21.8 [20°C(68°F) ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Engine Control Module (ECM) Schematic Diagrams

ECM Terminal And Input/Output signal ECM Terminal Function Connector [C100-K] PinNo.DescriptionConnected to1Power groundChassis Ground2Battery power (B+)Ignition Switch3Power groundChassis Ground4Battery power (B+)Main Relay5Power groundChassis Ground6Battery power (B+)Battery 7-8-?9Fuel Level Sender ...