CTS - what is it? Check the coolant sensor

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2018-04-03 13:00:28

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In modern cars the engine management system carries out the electronic unit, which receives information about the health status of its systems with appropriate sensors. Cooling system, designed to ensure optimum temperature of the motor, includes several such alarm devices. One of them is the sensor coolant temperature (CTS). What is this device and what are its functions, we will discuss in this article. In addition, we consider possible failure of this element of the cooling system, and how to diagnose and resolve them.CTS that it

The CTS: what is this sensor and why is it needed?

The temperature Sensor coolant is designed to obtain information about the temperature of the antifreeze or antifreeze in the system and subsequent transfer to an electronic control unit. Based on these data, the controller auto adjust:

  • Idle speed when the engine warms up;
  • Concentration of fuel in the combustible mixture;
  • Turn on and off the cooling fan cooling.

The working principle of the sensor is quite simple. It is based on the properties of semiconductors to change their electrical resistance under the influence of temperature.

What is the temperature sensor? The CTS consists of the following elements:

  • (container);
  • Solid-state thermistor (resistor that changes resistance with temperature change);
  • Conductive spring;
  • Electrical connector.Sensor CTS

How does the CTS?

Temperature Sensor coolant has two electrical terminals, one of which – body, closes to ground, and the second – “+” coming to the electronic unit. The controller sends to the CTS voltage of 5 V, which is transmitted to the working element by a conductive spring. The semi-conductor thermistor has a negative temperature coefficient, and when heated, the coolant in which it is immersed, its resistance begins to decline. Reduced the voltage. It for change electronic control unit calculates the temperature of the coolant in the system.

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Temperature Sensor, with its simple design, goes down very rarely, but if it happens, it is replaced with a new device. Sensor failure are easy to identify. Its failure is often accompanied by certain symptoms, peculiar only to the outside the CTS. What are those signs, read on.

Symptoms outside CTS

To Determine the sensor malfunction coolant temperature is possible by the following symptoms:

  • The appearance of the error message in the engine instrument panel;
  • Hard start cold engine;
  • High engine revs at idle speed;
  • Increased fuel consumption;
  • Engine overheating due to failure of the radiator fan.Replacing the CTS

The Last problem may be caused not only by the CTS. When failure of the radiator fan cooling first of all we should check its electric drive and the continuity of the wiring. Just make sure their health, it can be concluded that the engine overheating is to blame for the temperature sensor. The CTS may prove to be as hours and probation work.

The CTS: fault

For sensor fault coolant temperature are:

  • Violation of the calibration of the work element (thermistor), so that its resistance does not match specified temperature parameters;
  • Circuit positive contact to ground;
  • The tightness of the sensor housing;
  • No electrical contact on the connector.

As you can see, Troubleshooting the CTS not so much. In the first case, the sensor simply starts lying, deceiving electronic unit. Using false information will be forced to make bad decisions. Hence the hard starting of the engine, and excess fuel consumption, and delayed the inclusion of the radiator fan.coolant sensor where is located

Circuit in the sensor occurs when the deformation or the destruction of his body. This phenomenon is easily determined by the controller, as he delivers a corresponding signal to the instrument panel.

The tightness of the body most often also due to the mechanical damage of the sensor, at least – due to long operation.

In the absence of contact on the connectors CTS controller usually supports the operation of the engine in emergency mode, and the radiator fan just in case it works continuously.

The First three malfunction cannot be repaired. Here to rectify the situation can only replace the CTS. In the latter case the contact can be restored, that is not difficult. Then you definitely need to recheck the performance of the cooling system.

Where in the car to look for the CTS?

To Verify the fault or sensor error is possible by simple inspection. But first we have to know something about the location of the CTS. Where is the sensor coolant temperature in a specific car,better to learn from the leadership manual. The fact that different models may have different location. Most often the coolant sensor is installed on the inlet pipe of the cooling jackets of the cylinder head or on the thermostat housing.coolant sensor fault

It is Important not to confuse the temperature sensor coolant sensor temperature gauge (coolant DUTOI). The latter is also used to determine the temperature of the coolant, but its data are exclusively used to inform the driver.

Removal of the sensor

Check the CTS provides for removal of the sensor. For this you need to disconnect the negative terminal from the battery and partially drain the coolant. Then disconnected the connector on the body of the CTS. The sensor itself gets out of the housing with open-end wrench. Technological hole at the time of inspection is closed with a clean rag to prevent the ingress into the refrigeration system moisture or debris.

How to check the CTS?

To test the sensor you need:

  • Automotive tester (multimeter);
  • Electric kettle or other appliances for heating water;
  • Thermometer for liquids.Check CTS

Sensor Test is to determine the correctness of the calibration of the work item CTS. What does it mean? This means that the test is necessary to establish how well changes the thermistor resistance depending on temperature.

First switch is connected to the probes of the multimeter in the correct orientation. The device include in a mode of an ohmmeter. After that, the coolant sensor with a thermometer dipped in cold water and read their testimony. Next, the water is heated, while continuing to make measurements.

Below is a table for calibration of sensors coolant temperature.

Temperature 0

Resistance work item Ohm

0

7300-7500

+20

2600-2800

+40

1000-1200

+60

500-600

+80

300-350

+100

160-180

If the resistance value of a work item the CTS differ from those shown in the table, the sensor is defective.

How to replace?

The process of replacing the sensor will not cause any difficulties even for a person who never was engaged in repair of car, especially if the device has already been dismantled for inspection. The only thing to do is to buy a new CTS. The price of temperature sensors coolant depending on the brand of machine can vary in the range of 300-800 rubles.CTS price

Buying a CTS, all you need to do is to pre-test it the way described above (for greater certainty it is working), and then install it in place of the old and connect the appropriate connector. Then topped up the coolant and connect the ground wire to the battery. Next, start the engine, warm it up and observe the operation of the cooling system: whether the problem is resolved on the dashboard in a timely manner turns on the radiator fan, uniformly running motor, etc.

Helpful tips

  1. Before starting to replace the outside temperature sensor coolant, make sure the reason for it.
  2. Buy and install the CTS, only the modification which is provided by the manufacturer of the car.
  3. Regularly check the condition of the cooling system and the efficiency of its individual elements.
  4. Pay attention to the temperature of the coolant. The error on the instrument panel associated with the performance of the cooling system, immediately take action to eliminate the cause of the failure.
  5. Never put in the engine coolant or low quality water. Do not mix the antifreeze and antifreeze in the same system.


Article in other languages:

AR: https://tostpost.com/ar/cars/14328-cts.html

BE: https://tostpost.com/be/a-tamab-l/25592-dtozh---shto-geta-praverka-dtozh.html

DE: https://tostpost.com/de/autos/25609-dtozh---was-ist-das-umsatzsteuer-dtozh.html

ES: https://tostpost.com/es/coches/25629-dtozh---qu-es-esto-comprobaci-n-de-la-dtozh.html

HI: https://tostpost.com/hi/cars/14345-cts.html

JA: https://tostpost.com/ja/cars/14348-cts.html

KK: https://tostpost.com/kk/avtomobil-der/25568-dtozh---b-l-ne-tekseru-dtozh.html

PL: https://tostpost.com/pl/samochody/25501-dtozh---co-to-jest-sprawdzanie-dtozh.html

PT: https://tostpost.com/pt/carros/25509-dtozh---o-que-isso-verifica-o-de-dtozh.html

TR: https://tostpost.com/tr/arabalar/25574-dtozh---bu-nedir-kontrol-dtozh.html

UK: https://tostpost.com/uk/avtomob-l/25551-dtozh---scho-ce-perev-rka-dtozh.html

ZH: https://tostpost.com/zh/cars/15008-cts.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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