Kia Carnival (2009+). Manual — part 249

Fuel System

Engine Control System - Engine Coolant

Temperature Sensor (ECTS)

Fuel System

2009 > G 2.7 DOHC >

INSPECTION

FUNCTION AND OPERATION PRICIPLE

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 5 V in the PCM is supplied to the ECTS via a resistor in the PCM.That is, the
resistor in the PCM 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 PCM increases the fuel injection duration and controls the ignition timing using the
information of engine coolant temperature to avoid engine stalling and improve drivability.

SPECIFICATION

Temperature

Resistance(k!)

°C

°F

-40

-40

48.14

-20

-4

14.13 ~ 16.83

0

32

5.79

20

68

2.31 ~ 2.59

40

104

1.15

60

140

0.59

80

176

0.32

CIRCUIT DIAGRAM

COMPONENT INSPECTION

1. Turn ignition switch OFF.

2. Disconnect ECTS connector.

3. Remove the ECTS.

4. After immersing the thermistor of the sensor into engine coolant, measure resistance between ECTS terminals 1

and 3.

5. Check that the resistance is within the specification.

Specification: Refer to SPECIFICATION.

Fuel System

Engine Control System - Accelerator Position

Sensor (APS)

Fuel System