How to check ECTS (Engine coolant temperature sensor).

Hyundai coolant temperature sensor is also one of the most important in you car today, it control fuel and serve as switch for cooling system.

How to check ECTS( Engine coolant temperature sensor)

The engine coolant water temperature sensor is located in the engine coolant passage of the cylinder head. it detects the water temperature and relay signal to the ECU. it employs a thermistor, which i sensitive to changes in temperature. The electric resistance of a thermistor decreases in response to temperature  rise. The ECU judges engine coolant temperature by the sensor output voltage and provides optimum fuel enrichment when the engine is cold.

 Troubleshooting Hints

When idling speed is not appropriate or blacksmoke arises it is likely to be a defect of water temperature sensor.

Wiring harness inspection     

Refer to P0117, P0118

USING SCAN

Check item                   Data display            Check conditions            coolant temp.    set valve

water temperature       sensor temp.         ignition switch:on or        -20*c               -20*c
sensor                                                 engine running                   0*c                0*c
                                                                                              20*c                20*c
                                                                                              40*c                4o*c
                                                                                               80*c               80*c

Using multitester

1. Removed the water temperature from the engine coolant passage of the cylinder head.
2. With temperature sensing portion of the engine coolant temperature sensor immersed in the hot water check resistance.
   
   1) WTS Sensor.
   
   Temperature (*C)                                            Resistance (Kilo Ohms) 
          -40                                                        48.14
          -20                                                        14.13~16.83
            0                                                         5.790
           20                                                        2.31~2.59
           40                                                        1.148
           60                                                        0.5865
           80                                                        0.3222
          100                                                       0.1884
          110                                                 0.1451~0.1491
          120                                                      0.1163
   
   2) Gauge Unit
   
   Temperature (*C)                                          Resistance(ohms)
              60                                                       125
            85                                                   42.6~54.2
           110                                                  22.1~26.2
           125                                                      15.2
3. If the resistance deviates from the standard value greatly, replace the sensor.

Installation:

1. Apply sealant loctite 962T or equivalent to threaded portion.
2. Install water temperature sensor and tighten it to specified torque.
   Tightening torque : 3.0~4.0 kg.m
3. Connect the harness.

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