Kia Optima: Engine Control System / Engine Coolant Temperature Sensor (ECTS)
Specifications
Temperature
|
Resistance (kΩ)
|
°C
|
°F
|
45
|
113
|
244.8 - 281.4
|
55
|
131
|
162.5 - 186.5
|
60
|
140
|
133.5 - 153.5
|
71
|
159.8
|
88.93 - 102.13
|
85
|
185
|
55.16 - 63.36
|
110
|
230
|
26.02 - 29.82
|
125
|
257
|
17.5 - 19.7
|
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.
|
Components and components location
1. Engine Coolant Temperature
Sensor (ECTS)
|
|
Schematic diagrams
Harness Connector
Repair procedures
| 1. |
The engine control system can be more quickly diagnosed for troubles
by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")
KDS provides the following information.
| (1) |
Self diagnosis : Inspects and displays diagnostic trouble code
(DTC)
|
| (2) |
Sensor data : Checks the system input/output value status
|
| (3) |
Forced operation : Checks the system operating status
|
| (4) |
Additional function : Controls system options, zero point adjustment
and other functions
|
|
| 1. |
Turn ignition switch OFF.
|
| 2. |
Disconnect the engine coolant temperature sensor connector.
|
| 4. |
After immersing the thermistor of the sensor into engine coolant, measure
resistance between ECTS signal terminal and ground terminal.
|
| 5. |
Check that the resistance is within the specification.
Temperature
|
Resistance (kΩ)
|
°C
|
°F
|
45
|
113
|
244.8 - 281.4
|
55
|
131
|
162.5 - 186.5
|
60
|
140
|
133.5 - 153.5
|
71
|
159.8
|
88.93 - 102.13
|
85
|
185
|
55.16 - 63.36
|
110
|
230
|
26.02 - 29.82
|
125
|
257
|
17.5 - 19.7
|
|
| 1. |
Disconnect the negative battery terminal.
|
| 2. |
Remove the battery.
(Refer to Engine Electrical System - "Battery")
|
| 3. |
Disconnect the engine coolant temperature sensor connector (A).
|
| 4. |
Remove the ECTS (A).
|
Tightening torque :
29.4 - 39.2 N·m (3.0 - 4.0 kgf·m, 21.7 - 28.9 lb·ft)
|
|
Note that engine coolant may be flow out from the engine coolant
temperature control assembly when removing the sensor.
|
|
| • |
Install the component with the specified torque.
|
| • |
Note that internal damage may occur when the component is dropped.
If the component has been dropped, inspect before installing.
|
| • |
Apply the engine coolant to the O-ring.
|
|
| 1. |
Install in the reverse order of removal.
|
| 2. |
Refill the engine cooling system with engine coolant.
(Refer to Engine Mechanical System - "Coolant")
|
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