Kia Forte BD Quiz
Engine Control System/Fuel System

Engine Coolant Temperature Sensor (ECTS)

In this manual: Engine Control System/Fuel System
General Information — 8Maintenance — 32Engine Mechanical System — 47Engine Electrical System — 17Emission Control System — 10Engine Control System/Fuel System — 32Clutch System — 11Manual Transmission — 11DCT (Dual Clutch Transmission) System — 16Drive Shaft and Axle — 8Suspension System — 26Steering — 9Restraints — 11Brake System — 27Body (Interior and Exterior) — 119Body Electrical System — 98Heating, Ventilation, and Air Conditioning — 27
11steps
~66min
3/5difficulty
02040608010039.229N·mlb·ft
Tightening torque found on this page
Done 0 of 11

Specifications

Specification

Temperature Resistance (kOhm)
°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

Description and Operation

Description

The Engine Coolant Temperature Sensor (ECTS) is located in the cylinder head coolant passage to detect the engine coolant temperature. The ECTS uses a thermistor that changes resistance depending on temperature.

The electrical resistance of the ECTS decreases as the temperature increases, and increases as the temperature decreases. A reference +5V is supplied to the ECTS through a resistor in the ECM. In other words, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the resistance of the thermistor in the ECTS changes according to the engine coolant temperature, the output voltage also changes.

When the engine is cold, the ECM increases the fuel injection duration and controls ignition timing using the engine coolant temperature information to prevent engine stalling and improve drivability.

Circuit Diagrams

Wiring Diagram

Harness Connector

Repair Procedures

Inspection

  1. Turn the ignition off.

  2. Remove the ECTS (Refer to Removal).

  3. After immersing the sensor thermistor in engine coolant, measure the resistance between ECTS terminals 1 and 3.

  4. Make sure the resistance is within specification.

    Temperature Resistance (kOhm)
    °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

Removal and Installation

  1. Turn the ignition switch OFF and disconnect the negative (-) battery terminal.

  2. Remove the air cleaner assembly and the air intake hose.

    (Refer to Engine Mechanical System - "Air Cleaner")

  3. Remove the battery.

    (Refer to Engine Electrical System - Battery)

  4. Disconnect the engine coolant temperature sensor connector (A).

  5. Remove the Engine Coolant Temperature Sensor (B).

    Engine Coolant Temperature Sensor:

    29,4–39 N·m

  6. Install in the reverse order of removal.

  7. Fill the engine coolant.

    (Refer to Engine Mechanical System - Engine Coolant)

Test yourself

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