Kia Optima: Engine Control System / Engine Coolant Temperature Sensor (ECTS)
Specifications
| 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 |
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. |
Components and components location
| Components Location |
| 1. Engine Coolant Temperature
Sensor (ECTS) |
Schematic diagrams
| Circuit Diagram |
Harness Connector
Repair procedures
| Inspection |
| 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.
|
| Components Inspection |
| 1. |
Turn ignition switch OFF. |
| 2. |
Disconnect the engine coolant temperature sensor connector. |
| 3. |
Remove the sensor. |
| 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.
|
||||||||||||||||||||||||||
| Removal |
| 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).
|
| Installation |
|
| 1. |
Install in the reverse order of removal. |
| 2. |
Refill the engine cooling system with engine coolant. (Refer to Engine Mechanical System - "Coolant") |
Manifold Absolute Pressure Sensor (MAPS) & Intake Air Temperature Sensor (IATS)
Specifications
Specification
Manifold Absolute Pressure Sensor (MAPS)
Pressure
Output Voltage (V)
kPa
kgf/cm²
...
Crankshaft Position Sensor (CKPS)
Description and operation
Description
•
Crankshaft Position Sensor (CKPS) detects the crankshaft position and
is one of the most important sensors of the engine cont ...
Other information:
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