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11. PGM-FI. Входы термисторов (датчики ECT, IAT)

Фото в бортжурнале Honda Accord (4G)1979 Соичиро посещает один из недавно открытых мотоциклетных заводов в США.

Если Вы нанимаете только людей, которых вы понимаете, компания никогда не получит людей лучше, чем Вы. Всегда помните, что Вы часто можете найти выдающихся людей среди тех, кто Вам не особенно нравится.
— Соичиро Хонда

11 Входы термисторов

11.1 Общий обзор

Система впрыска топлива Honda PGM-FI использует несколько различных типов входов для определения ширины импульса инжектора PW, управления зажиганием и целым рядом других выходов. В этой главе рассматриваются два входа термисторов:
— датчик температуры всасываемого воздуха (IAT)
— датчик температуры охлаждающей жидкости двигателя (ЕСТ).

И датчик IAT и ECT используют термистор для контроля изменения температуры. Термистор представляет собой специальный резистор, который изменяет свое значение сопротивления при изменении температуры. В этом вы можете легко убедиться, посмотрев график отношения сопротивления/температура (таблица 1 в конце главы) на этих датчиках. Большинство сервис-мануалов Honda включают в себя этот график.

Оба этих датчика используют тот же самый термистор. Они имеют одинаковое температурное сопротивление, что означает, что они могут быть протестированы одним и тем же способом.

11.2 Как это работает?

Эти датчики имеют два провода, которые идут в блок управления двигателем (ECM). Блок ECM подает напряжение на датчики и измеряет падение напряжения на нем для определения его входного сигнала.

Фото в бортжурнале Honda Accord (4G)

Сопротивление термистора «стартует» с высокого значения (10K+ Ом) в холодном состоянии и падает до низкого (около 300 Ом) при достижении рабочей температуре. Так, когда машина холодная (сопротивление термистора высоко) все 5 вольт проходят через термистор. Когда температура достигла рабочего значения (сопротивление термистора низкое) большая часть напряжения отбрасывается. Эта зависимость температуры / напряжения показана в таблице 2 в конце модуля.

11.3 Примерное расположение

Датчик ЕСТ обычно вкручен в верхней части корпуса термостата или в задней части головки блока цилиндров (как правило, под распределителем зажигания). Датчик температуры воздуха на впуске расположен где-то во впускном тракте. Некоторые модели Acura использовали датчик массового расхода воздуха (MAF) для контроля воздушного потока. В этих моделях датчик IAT интегрирован в датчик массового расхода воздуха. Чаще всего датчик IAT располагается либо непосредственно на впускном коллекторе либо во впускной гофре, идущей от воздушного фильтра. Некоторые варианты расположения
этих датчиков показаны на рисунках 11-1,11-2 и 11-3.

Фото в бортжурнале Honda Accord (4G)

11.4 Как вы можете проверить их?

11.4.1 Тест на сопротивление

В заводских мануалах Honda процедура проверки датчика ЕСТ / IAT описывается только тестом на сопротивление. Сопротивление датчика изменяется пропорционально его температуре. В таблице 1 (в конце главы) приведены значения сопротивления при различных температурах. Недостаток этой процедуры заключается в том, что датчик не может быть проверен на "жизнеспособность". Вы должны отключить датчик, чтобы проверить его сопротивление, в результате чего установится код DTC, если двигатель работает. Кроме того, довольно трудно коснуться тестером 2-х клемм датчика, не замыкая их между собой.

Если вы тестируете этот датчик, в то время пока он установлен на двигателе, тест на напряжение намного проще и более эффективен.

11.4.2 Тест по напряжению

Теперь, когда мы знаем об этом явлении падения напряжения, мы можем проверить термисторы контролируя их напряжение, что гораздо проще и эффективнее, чем измерение их сопротивления. Вы можете проверить напряжение термистора "онлайн" на машине с работающим двигателем. При проверке этих датчиков так, как рекомендует сервис-мануал, вы должны остановить двигатель, отсоединить фишку от датчика и измерять сопротивление. Правда неудобно? Теперь мы можем просто контролировать напряжение на датчике с помощью стандартного DVOM (тестера) и делать это непрерывно, даже, в случае необходимости, при движении.

Просто подключите черный терминал (провод) DVOM к «массе» транспортного средства, а красный терминал (провод) DVOM подсоедините к сигнальному проводу на датчике. Не беспокойтесь к какому проводу подключаться. Если вы перепутаете сигнальный провод, то тестер просто покажет вам 0. Следовательно, нужный вам провод – второй.

Когда проверяется холодный двигатель, напряжение на сигнальном проводе датчика должно быть достаточно высоким (2,5-4,5 вольт) в зависимости от температуры окружающей среды (см. таблицу 2 — в конце главы). Во-вторых, пока двигатель холодный, вам надо убедиться что величины на обоих датчиках (ECT и IAT) одинаковые. Помните, два термистора имеют одинаковую кривую зависимости температура / сопротивление, поэтому пока двигатель холодный, на сигнальных проводах должен быть один и тот же сигнал.

По мере прогрева двигателя напряжение будет устойчиво падать, до достижения рабочей температуры. Напряжение на датчике ECT при достижении рабочей температуры упадет до 0.5-0,6 вольт. Это напряжение настолько чувствительно, что вы можете наблюдать колебания в несколько десятых вольта при включении вентиляторов системы охлаждения двигателя. Фактическое Значение стартового напряжение на датчике не так важно, как устойчивое снижение его от начального напряжения, до величины равной приблизительно 0,5-0,6 вольт при достижении нормальной рабочей температуры.

Для того, чтобы тщательно проверить эти датчики, вы можете настроить цифровой осциллограф (DSO) для контроля напряжения во время прогрева. Большинство таких приборов может отображать на экране 10-минутный интервал за одно измерение. Любое отклонение от плавного устойчивого падения напряжение указывает на неисправный ECT. Этот тип отказа характерен для датчика ECT, но не для датчика температуры воздуха на впуске IAT.

Фото в бортжурнале Honda Accord (4G) Фото в бортжурнале Honda Accord (4G)

11.4.3 Тест заменой сопротивления

Если вы подозреваете, что датчик температуры охлаждающей жидкости ECT неисправен, вы можете временно заменить его на резистор с сопротивлением 330 Ом (Radio Shack # 271-113). Вот лучший подход:

• Запустите двигатель и подождите, пока он достигнет рабочей температуры
• Остановите двигатель
• Отключите датчик температуры охлаждающей жидкости ECT и замените на резистор с сопротивлением 330 Ом. Это создаст условие, при котором в ECM будет поступать сигнал о полностью прогретом двигателе.
• Если проблема исчезла, у вас неисправный ECT.

11.5 Сервисные советы

11.5.1 Проблемы с холодным запуском

На любой Honda, если клиент жалуется на затрудненный запуск двигателя (особенно холодный запуск), то первым делом проверьте входное напряжение датчика температуры охлаждающей жидкости ECT по его параметрам (таблица 2 — в конце этой главы). Вы можете сделать это, даже не заводя автомобиль. Тем самым вы сможете исключить одну из самых распространенных причин проблем с холодным запуском, при этом не теряя много времени.

11.5.2 Автомобиль плохо заводиться на горячую?

Датчик ЕСТ может вызывать все виды проблем с запуском двигателя, но в основном он является причиной затрудненного запуска на горячую. Типичная неисправность этого датчика заключается в том, что его показания являются нормальными при запуске на холодную, затем напряжения плавно падает, но по мере приближения температуры двигателя к рабочей, показания снова «уплывают» вверх к «холодному» состоянию. Вы можете легко это увидеть, наблюдая за напряжением датчика с помощью DSO.

Фото в бортжурнале Honda Accord (4G)

Если ECT неисправен и сообщает ECM о холодном состоянии двигателя, то ECM думает, что машина снова остыла, когда она на самом деле находится при нормальной рабочей температуре. Это все не создаст больших проблем, когда автомобиль работает в режиме Closed Loop. Большинство Honda игнорирует входные показания датчика ECT после перехода в режим CL.

Проблема проявится в том, когда вы остановите двигатель и попытаетесь завестись снова. Когда ECM одновременно "увидит" стартовый сигнал и «холодный» сигнал от датчика ECT, он увеличит PW форсунки от нормальной величины в 2-3мс до 60-70мс (см. рис. выше). Прогретый двигатель обычно «заливает» таким количеством топлива, что затрудняет «горячий» перезапуск.

Вполне вероятно, что эта проблема с датчиком ECT вызовет меньше проблем на машинах, оборудованных OBD-II . Правила OBD-II требуют, чтобы входные датчики проверялись на рациональность информации в дополнение к простому тесту высокого / низкого значения. Данная ситуация является не рациональной, т.к. полностью прогретый двигатель не может остыть в течение миллисекунд, как это мы видели на графике. Поэтому, в OBD-II, скорее всего, установится ошибка DTC, чтобы предупредить вас о иррациональном поведении данного датчика.

Если вы находитесь в крайнем положении и нужно, чтобы двигатель запустился на «горячую», и вы подозреваете, что неисправен датчик ECT, просто отключите его. При отключении датчика температуры охлаждающей жидкости ЕСМ войдет в «аварийный» режим, проигнорирует входной сигнал от датчика температуры охлаждающей жидкости и начнет использовать внутренние данные. Обычно двигатель запустится таким образом без проблем. Конечно, будет установлен код неисправности (DTC), но вы сможете сбросить его позже.

DTC для датчика ECT — № 6. DTC для датчика IAT — № 10. Обратите внимание, что эти два датчика редко устанавливают код неисправности, даже если они достаточно далеки от нормального диапазона. Если у вас в руках Honda, у которой проблемы с «холодным» или «горячим» стартом, проверьте датчик температуры охлаждающей жидкости, даже если код неисправности не высвечивался!

What is ECT sensor? Types, Diagnosing and Replacing

The Engine Coolant Temperature (ECT) Sensor is a crucial component in modern day automobile engines. It plays an important role in monitoring and controlling the temperature of the engine to ensure optimal performance and fuel efficiency. The ECT sensor works by measuring the temperature of the engine coolant, which is then used by the Engine Control Module (ECM) to adjust various engine parameters.

The ECT sensor is typically located near or on the thermostat housing, where it can measure the temperature of the coolant as it exits from the engine block. It is usually made up of a thermistor, which changes its resistance based on changes in temperature, and a wiring harness that connects it to the ECM.

One of the primary functions of the ECT sensor is to provide information about coolant temperature to help regulate fuel injection. As engines warm up, they require less fuel for combustion due to increased efficiency at higher temperatures. By using data provided by an ECT sensor, an electronic control module can adjust fuel delivery accordingly.

Another key function of this sensor is helping manage emissions output from your vehicle’s exhaust system. Specifically, if your car’s computer detects that temperatures are running too high or too low compared with what’s typical for your make and model — especially when you’re not driving aggressively — it may trigger warning lights on your dashboard or even prevent certain systems from working until repairs are completed.

Overall, without proper functioning of an ECT Sensor can lead to decreased gas mileage and reduced power output while also putting additional stress on other parts of your vehicle such as spark plugs & injectors that rely on accurate temp readings from this vital piece equipment!

Overview of Engine Control System

The engine control system, also known as the powertrain control module (PCM), is responsible for managing and regulating various components of a vehicle’s engine. The PCM uses input signals from various sensors to determine the ideal air/fuel mixture, ignition timing, and other critical factors that affect engine performance.

The main components of an engine control system include the PCM, sensors such as the ECT sensor, throttle position sensor (TPS), oxygen sensor (O2), and camshaft position sensor (CMP). These sensors feed information to the PCM which then adjusts fuel delivery via injectors or carburetors.

Some common issues with an engine control system can include poor fuel economy, rough idling or stalling, difficulty starting your car in cold weather conditions. If you are experiencing any of these issues with your vehicle it may be necessary to have a professional mechanic take a closer look at your engine’s control system.

Regular maintenance such as changing air filters and spark plugs can help keep your engine running smoothly. Additionally, checking for codes related to problems with the ECT sensor or other parts of the PCM can help identify potential issues before they become bigger problems.

Overall, understanding how your vehicle’s engine control system works is important in order to maintain optimal performance and avoid costly repairs down the road.

Importance of Engine Temperature Monitoring

The engine is the heart of any vehicle, and like any other machine, it generates heat as it operates. The internal combustion process that powers an engine can generate temperatures upwards of 2000 degrees Fahrenheit. However, when a car overheats, it can cause significant damage to its components and lead to costly repairs or even total engine failure.

Engine temperature monitoring is critical in keeping your car operating efficiently and safely. An electronic coolant temperature (ECT) sensor helps regulate these high temperatures by monitoring the coolant’s temperature circulating through the engine block and cylinder head. This data allows the ECU (engine control unit) to adjust fuel injection timing, ignition timing, and other parameters necessary for optimal performance.

A malfunctioning ECT sensor can trigger a check engine light on your dashboard as well as affect how your car runs. When an ECT sensor fails or reads incorrectly due to age or damage from external elements such as rust or corrosion within its threads inside the engine block or cylinder head’s cooling system passages can lead to inaccurate readings causing issues with performance optimization.

It is crucial to have regular maintenance on this vital component because if left unchecked,it may become detrimental over time leading up too much higher expenses down-the-line than just replacing an ECT Sensor which should be done every 60k-100k miles depending upon manufacturer recommendations for safety reasons while simultaneously avoiding major problems with your vehicle in the future due to incorrect readings being transmitted by this important part.

In summary:

  • The importance of maintaining proper engine temperature cannot be understated when it comes to ensuring efficient vehicle operation.
  • An Electronic Coolant Temperature (ECT) Sensor monitors coolant temperatures circulating throughout engines.
  • Maintaining this vital component through regular maintenance ensures accurate readings are being transmitted from sensors preventing serious malfunctions and vehicle downtime.

Introduction to ECT Sensor

The Engine Coolant Temperature (ECT) sensor is an essential component of a vehicle’s engine management system. It measures the temperature of the engine coolant and sends this information to the computer that controls various aspects of the engine’s operation, such as fuel injection timing and cooling fan operation.

The ECT sensor is typically located on or near the thermostat housing in the engine block. It consists of a sensing element that changes resistance with temperature and a wiring harness that connects it to the engine control module (ECM). The ECM uses this information from the ECT sensor along with data from other sensors to determine how much fuel needs to be injected into each cylinder, when ignition should occur, and whether or not additional cooling is necessary through use of electric fans.

Most modern vehicles use a two-wire ECT sensor design which allows for more accurate readings than older single wire designs. The two wires allow for more precise voltage measurements across varying temperatures and provide greater accuracy even at extreme temperatures.

If there is any issue with your ECT sensor, you may notice symptoms such as decreased fuel economy, poor acceleration, rough idling or difficult starting. Additionally, if your check engine light comes on it may indicate an issue with your ECT sensor. If you experience any issues related to these symptoms then it’s always best to get them diagnosed by a certified mechanic who will be able diagnose whether or not there are problems related specifically with your car’s Engine Coolant Temperature Sensor.

Types of ECT Sensors

There are two main types of ECT sensors that are commonly used in various applications. These include:

1. Negative Temperature Coefficient (NTC) Sensors:

These sensors have a negative temperature coefficient, which means their resistance decreases as the temperature increases. NTC sensors are usually made up of ceramics or polymers, and they are designed to be highly sensitive to changes in temperature.

NTC sensors can be used for a wide range of applications, including monitoring the engine coolant temperature in cars and trucks, measuring air temperatures in HVAC systems, and monitoring body temperatures in medical applications.

2. Positive Temperature Coefficient (PTC) Sensors:

PTC sensors have a positive temperature coefficient, which means their resistance increases as the temperature increases. PTC thermistors are usually made up of ceramic materials with barium titanate being one such material that is commonly used.

PTC thermistors find application in overcurrent protection circuits where they act like circuit breakers by increasing their resistance when current passing through them exceeds safe levels thus limiting further flow preventing damage to sensitive components.

Both NTC and PTC sensors come with different accuracy levels depending on the design specifications set out by manufacturers; some may only give approximate values while others could provide accurate readings down to fractions of degrees Celsius.

In conclusion, understanding what type of sensor is best suited for your application requires careful consideration based on factors such as cost-effectiveness, accuracy needed, size constraints among other considerations relevant to your specific use case scenario.

How ECT Sensor Works

The Engine Coolant Temperature (ECT) sensor is an essential part of a car’s engine control system. It is responsible for monitoring the temperature of the engine coolant and transmitting that information to the Engine Control Unit (ECU). The ECU uses this data to adjust fuel injection timing, ignition timing, and other critical parameters.

The ECT sensor works by measuring the resistance of a thermistor located inside it. A thermistor is a type of resistor whose resistance changes with temperature. The higher the temperature, the lower its resistance becomes. Conversely, as temperature decreases, its resistance increases.

When voltage is applied across the thermistor inside the ECT sensor and current flows through it, it generates an output voltage that varies depending on its resistance value. This output voltage signal is then sent to the ECU where it’s interpreted as engine coolant temperature data.

Most modern cars use either one or two ECT sensors; one located near or in contact with the thermostat housing and another at or near cylinder head(s). These sensors work together to provide accurate readings for overall engine operation.

If there are issues with your vehicle’s cooling system such as low coolant levels or faulty radiator fans that cause overheating, this could affect how well your car’s Engine Coolant Temperature (ECT) sensor works. Any leaks found around these components should be addressed immediately before they damage other parts like hoses or water pump seals which may lead to further problems down-the-line if not repaired promptly.

In conclusion, knowing how your car’s Engine Coolant Temperature (ECT) sensor works can help you diagnose any issues you might have with your car’s cooling system early enough before major damages occur which could result in costly repairs down-the-road if not addressed timely.

Location of ECT Sensor in Different Vehicles

The location of the Engine Coolant Temperature (ECT) sensor varies depending on the make and model of the vehicle. The ECT sensor is used to monitor the temperature of the engine coolant, which helps in regulating fuel injection and ignition timing.

  • Ford: In most Ford vehicles, including F-150, Mustang, and Taurus models, the ECT sensor is located near or at the thermostat housing.
  • Chevrolet: For Chevrolet vehicles such as Silverado and Camaro models, the ECT sensor can be found near or at the water outlet.
  • Dodge: Dodge Ram trucks usually have their ECT sensors placed close to where coolant flows into and out of their engines. It may be found by following upper radiator hose from radiator to engine block.
  • Honda: Honda Civic’s ECT sensor is situated on top of its engine below intake manifold. Other Honda models may have it located near its thermostat like some Ford cars do.

Other car manufacturers also place their ECT sensors differently. Some may locate them near or at cylinder heads while others put them above exhaust manifolds. It’s important for a mechanic or technician to know where an ECT sensor is positioned so that they can replace it easily when necessary.

In summary, there are various places where an ECT sensor might be installed in different vehicles from different automobile makers. Knowing what type you have will help you find its specific location easier if ever you need it checked or replaced by your local auto repair shop or dealer service center.

Symptoms of a Faulty ECT Sensor

The Engine Coolant Temperature (ECT) sensor is an essential component in the engine’s cooling system. It measures the temperature of the coolant and sends signals to the engine control unit (ECU) to adjust fuel delivery, ignition timing, and other parameters that affect engine performance. A faulty ECT sensor can cause several problems with your vehicle’s operation.

1. Poor Fuel Economy

A malfunctioning ECT sensor can send false information to the ECU regarding coolant temperature, causing it to inject more fuel than necessary into the combustion chamber. This results in poor fuel economy as well as increased emissions from your vehicle.

2. Overheating or Underheating

If your car’s thermostat is working correctly, but you notice that it overheats or underheats frequently, this could be due to a faulty ECT sensor sending incorrect readings to the thermostat, causing it not to open/close accordingly.

3. Hard Starting or Stalling

The ECT sensor also provides critical information for starting and idling your car smoothly by communicating with its computer about how much air/fuel mixture is needed during these phases of operation. If this data is skewed due to a bad connection between sensors/ECUs or inaccurate readings coming from sensors themselves; hard starts/stalls might happen often!

4. Ignition Timing Issues

Inaccurate measurements taken by an unreliable ECT Sensor can lead engines running at improper temperatures resulting in incorrect ignition timing being used which leads rough idle & acceleration problems while driving.

In summary,

The symptoms outlined above are just some of what you may experience if there are issues with your car’s Engine Cooling Temperature (ECT) sensor. It is important to replace the faulty ECT Sensor as soon as possible to avoid more serious problems that could arise in the future.

Diagnosis and Replacement of ECT Sensor

The Engine Coolant Temperature (ECT) sensor is an important component in a vehicle’s engine management system. It measures the temperature of the engine coolant and sends this information to the onboard computer, which uses it to control various aspects of the engine’s operation. If the ECT sensor fails, it can cause a variety of problems with your car’s performance, including reduced fuel efficiency and increased emissions. Therefore, it is essential to diagnose and replace a faulty ECT sensor as soon as possible.

Diagnosing a Faulty ECT Sensor

There are several symptoms that may indicate a problem with your car’s ECT sensor:

  • Your car may experience poor fuel economy or have trouble starting.
  • You may notice irregularities in your vehicle’s idle speed or hesitation during acceleration.
  • Your dashboard warning light might come on due to high coolant temperatures even when there’s no reason for overheating.

If you suspect that your car has an issue related to its ECT sensor, you should take it to an auto repair shop such as Autozone or O Reillys Auto Parts where mechanics will use diagnostic equipment like multimeter along with scanner tools specifically designed for identifying faults in sensors.

Replacing an ECT Sensor

If diagnostics reveal that you need to replace your vehicle’s faulty ECT sensor then follow these steps:

    1. Gather necessary tools: A socket wrench set and pliers will be required for removing old sensors from their mounting location if needed.
    2. Locate the ECT sensor: The location of the ECT sensor may vary depending on your vehicle’s make and model. The most common locations include near the thermostat housing or in the engine block itself.
    3. Remove old sensor: Once you locate it, use a socket wrench set to remove any bolts holding your current ECT sensor in place. Be careful not to damage any other components while doing so.
    4. Clean up residual debris: To ensure that there are no debris left behind, clean up any remaining gasket material or corrosion from around where its mounted before installing new sensors.
    5. Install new sensor: Carefully insert new sensors into their mounting location without applying too much force as they can easily break because they’re made of plastic. Tighten all bolts until snug but not too tight using a torque wrench if necessary.
    6. Connect wiring harness: Plug in the wiring harness for the new ECT sensor and secure it into place using any clips or ties provided with purchase.
    7. Test function: Crank up your engine to make sure your replacement of ECT sensor has worked properly by running diagnostic tests on the vehicle’s onboard computer system.

    If you have any doubts about how to replace an ECT sensor, it is always recommended that you consult a professional auto mechanic. They can provide expert guidance on diagnosing and replacing faulty sensors, ensuring that your car runs smoothly and efficiently.

    Conclusion

    In conclusion, the Engine Coolant Temperature (ECT) Sensor is a vital component of a vehicle’s engine management system. It measures the temperature of the coolant and sends this information to the vehicle’s Engine Control Module (ECM). The ECM then uses this data to adjust fuel injection timing, ignition timing, and other parameters that affect engine performance.

    A faulty ECT sensor can cause several issues with your vehicle’s operation. These include poor fuel economy, difficulty starting or stalling when idling, or an illuminated Check Engine Light. Therefore it is important to ensure that your ECT sensor is functioning correctly and replace it if necessary.

    To diagnose a problem with an ECT sensor, you can use an OBD-II scanner to read any trouble codes stored by the ECM related to coolant temperature. A multimeter can also be used to test for proper voltage output from the ECT sensor.

    Replacing an ECT sensor is typically a straightforward process depending on its location within the engine bay. However, it may require draining some coolant before removal and reinstallation.

    Overall, understanding how your car’s cooling system works along with its different components such as sensors like the ECT Sensor will help you in taking better care of your vehicle’s engine health and increase its longevity while improving performance at all times

    ECT Sensor – What Is It And How Does It Work?

    ECT Sensor

    Your ECT sensor is an important part of your vehicle that can help you with the inner workings of your car’s engine. In a car with an internal combustion engine, the cooling system is in charge of maintaining the temperature. This is done in order to prevent the engine from overheating.

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    The engine coolant temperature sensor, also known as the ECT sensor, is a negative temperature coefficient thermistor – meaning, the electrical resistance goes down, while the temperature rises. When a signal from the ECT sensor is missing or it is outside of the expected range, the powertrain control module turns on the check engine light. The ECT can be known as a thermistor that changes resistance depending on the temperature.

    What Is The ECT Sensor?

    Since we know that the temperature sensor is a negative temperature coefficient thermistor, we know that the electrical resistance decreases when the temperature increases. The end of the ECT sensor enters into one of the cooling system passages, where it is covered in coolant.

    Many cars contain more than one coolant temperature sensor. If there is an issue with the coolant temperature sensor, the coolant temperature light might turn on . In most vehicles, the main ECT sensor is called the primary ECT sensor, or ECT sensor one. This is installed near the thermostat within the cylinder head or block. The cylinder head sits above the cylinders on top of the cylinder block in an internal combustion engine. The cylinder head is in charge of closing the top of the cylinder to form the combustion chamber.

    A second coolant temperature sensor is generally installed in another part of the engine or in the radiator. It is important to keep the radiator in working condition, since this is the most common source of antifreeze leaks. This ECT sensor works together with the ECT sensor one.

    Some cars use a cylinder head temperature or a CHT sensor in addition to the ECT sensor. The CHT sensor works similar to the ECt sensor, but it measures the cylinder head metal temperature. This allows the CHT sensor to measure the engine temperature correctly, even if the coolant is leaking.

    The ECT sensor is connected to the main computer, also known as the powertrain control module. The PCM provides a reference voltage and monitors the ECT sensor signal. Depending on this signa, the PCM changes the engine performance and radiator fans when the temperature hits a certain level.

    If the ECT sensor is missing, or is not in the proper range, the PCM turns on the check engine light and can store the trouble code for later problems.

    ECT Sensor Problems

    With any part of the car, the ECT sensor can have problems that need repairing and fixing. Keeping your parts in working order can ensure that you gain top dollar for them if you decide to sell your car later on. First, one of the most common ECT sensor problems is when the sensor contains a poor connection, or has a problem with the wiring harness. A wiring problem can cause the engine to stall. A disruption in the ECT sensor connection can interrupt the signal to the PCM, causing the PCM to set a fault. In some vehicles, the signs of this issue will show themselves as strange and erratic readings in the temperature gauge. This may cause the engine to run in fail-safe mode, causing the fans to run constantly and the air conditioner to shut off.

    In addition to the connection issues, corrosion at sensor terminals can cause ECT sensor problems. Depending on the severity of the situation, the corrosion may have done extreme damage to the connector and CHT sensor. This may cause the connector and CHT sensor to be replaced.

    The last ECT sensor problem that is quite common is that the ECT sensor could be reading a bad thermostat or dealing with cooling system issues. The leaking head gasket could be a sign of ECT sensor problems. Since the ECT sensor is not an expensive part, a replacement is the best solution.

    Ways To Test The ECT Sensor

    Now that we know what an ECT sensor is and the important function that it performs, we need to know how to test the ECT sensor if we think that it is faulty. Since the tip of the sensor has to be placed in coolant, the low coolant level inside the system can cause the ECT sensor signal to be faulty. The ECT sensor connector should be checked for damaged pins or corrosion. We will go over a few ways to test the ECT sensor.

    Method 1 – Measure Resistance

    One way to measure the ECT sensor resistance is to test the sensor at different temperatures and compare the readings to the base-line levels set forth in the service manual. The resistance of the sensor can only be measured when the sensor is properly removed from the circuit. If you measure the resistance of any component still within the electrical circuit, then the measurement won’t be correct.

    Method 2 – Checking the ECT sensor Voltage

    A second way to test the ECT sensor is to measure the voltage across the sensor terminals while the ignition is turned on. The ECT sensor is connected to the powertrain control module. The PCM can supply the reference voltage, while another wire is the sensor ground. The reference voltage and the ground wire must be checked. When the resistance of the ECT lowers as the engine warms, the voltage drops as well. Comparing the ECT sensor resistance to the voltage is a way to determine if the ECT sensor is working correctly.

    Method 3 – Compare The ECT Sensor Readings

    Another way to measure the ECT sensor and see if it is working correctly is to measure the readings against other temperature sensors. You can use the intake air temperature sensor to perform the calculation and reading. If You perform this reading on a car that has been parked somewhere overnight, the temperature of hte engine, by utilizing the ECT sensor, and the temperature of the IAT sensor should be very similar. However, if the difference is much greater, then it would mean that one of the ECT sensors is faulty and incorrect.

    Method 4 – Diagnose Temperature Sensor Problems

    If you have found that there is an intermittent problem with the ECT sensor, then you will need to use a scanning tool to diagnose the issue. Mechanics usually have this at their shop, and will know how to properly use the tool. With the scan tool connected, a mechanic can monitor the ECT sensor voltage while moving the harness connector. If there is a change in voltage, then this indicates a problem area.

    A second way to do this is with the ECT temperature. You could monitor the coolant temperature, and take note of hte temperature level. You can simulate an intermittent poor connection by disconnecting and quickly reconnecting the ECT sensor. If the temperature comes back up, this is a good sign regarding the accuracy of the ECT sensor.

    Another portion to notice with the temperature reading of the ECT sensor is that when it is disconnected, the temperature reading might not read correctly. This can show trouble codes relating to the ECT sensor. If the PCM sets a trouble code, it then stores a snapshot of parameters at the time the issue arose. This could show a problem with the ECT sensor or the wiring harness, which could cause your engine to stall .

    ECT Sensor Replacement

    In many cars, replacing the ECT sensor is a harmless and pain-free task. The sensor is generally held by a clip. In some cars, a deep socket might be needed, although this is rare. Replacing the ECT sensor in a repair shop generally runs from $59-$129 for an average car. The ECT part itself is not very expensive, so you can use a refurbished part if you choose.

    After the ECT sensor is replaced, the cooling system will need to be checked to ensure that there are no air pockets within the system, affecting the coolant inside. When you are replacing the ECT sensor, it is imperative to change the new sensor to the personalized specifications.

    How To Avoid Problems With The ECT Sensor

    Although this part of the vehicle was designed to last forever, there are many instances when this is not the case. As with all cars, problems can occur if you do not properly maintain the parts. Some owners get lazy, and others don’t want to think about the financial strain that it may cost to pay for some repairs. However, repairing and maintaining the ECT sensors so they work at an optimal level is crucial to the lifespan of your car.

    Here we will go over how to avoid some problems with the ECT sensor. By following these steps, you will hopefully avoid running into any issues that spring up from not maintaining the ECT sensor and the coolant system.

    Never Use Tap Water

    First, you should never use tap water to refill the radiator. Also, avoid using tap water to fill the coolant reservoir. Filling the reservoir with tap water can cause a coolant leak. Most tap water contains particles of rust and other detrimental minerals that can be harmful in the long run and the lifespan of your car. This can become especially prevalent if the water boils, since this will cause it to evaporate within the radiator. A leaking radiator is a very common car problem.

    If you use proper coolant, this prevents the water from boiling, and does a better job at lubricating. The coolant can lubricate the engine block and the radiator, which doesn’t allow rust to form on the inner parts of the car. Using the correct ratio and mix of water and coolant in your vehicle can prevent rust from forming and increase the longevity of your car.

    Fix Oil Leaks As Soon As Possible

    Second, you should try to fix oil leaks and gasket leaks as soon as they occur. The majority of oil leaks are due to damaged engine gaskets, oil pan leaks, or poor connections. If oil enters the engine block, the coolant will then be contaminated with the oil. If the coolant is damaged, then this will reduce the service life of the temperature sensor. The mixture of coolant and oil will harm the ECT sensor and change the lifespan. In addition to the oil leak, high oil consumption can be a sign of a serious problem and corrosion in your engine.

    Fix Coolant Leaks As Soon As Possible

    Third, you need to fix the coolant leaks immediately and quickly. The cooling system in your car is a sealed-type system, which means it is rare that you need to constantly fill the reservoir with water. If antifreeze is leaking, this can occur at your reservoir along with the coolant. If there isn’t enough coolant in the system, the ECT sensor might obtain false readings, which can negatively affect engine performance and the engine lifespan.

    Cost Of Fixing The ECT Sensor

    If you have found that your ECT sensor is providing bad readings and you care concerned about the lifespan of this mechanism, then you will need to get it fixed. The average cost for an engine coolant temperature sensor replacement generally runs between $203-$255. Labor costs are typically between $146 and $185 on average. The parts themselves are usually only $57-$70.

    What If My ECT Sensor Isn’t Working Properly and I Don’t Want To Fix It?

    If you found that you need to fix your ECT sensor and you are worried about the funds for paying for hte repair, then you might want to look into other options. It is important to check on the other parts of your vehicle to see if they are in working order. If your car isn’t running well and it is old, you might consider selling your car for junk at a proper location.

    Head to CashCarsBuyer for a fair quote , reputable service, and some money towards your new vehicle. By trading in your junk car, you can make some quick cash at a trustworthy spot. Remove all non-metal components from your car and sell them before bringing your car to CashCars. After you are done with the entire process, you will have plenty of money to save for your new, safe, and working vehicle!

    ECT (Engine coolant temperature) — датчик температуры двигателя. Показания.

    ECT (Engine Coolant Temperature или Датчик температуры охлаждающей жидкости) – датчик, который ввернут в блок цилиндров, в ГБЦ или в блок с термостатом, использующийся для определения температуры охлаждающей жидкости в моторе.

    Датчик температуры (ECT-датчик) в основном представляет из себя термистор (терморезистор), который меняет свое сопротивление с изменением температуры.

    Когда температура мотора высокая сопротивления датчика низкое, а когда низная, наоборот высокое.

    Эти показания сопротивления отправляются в блоки управления автомобиля, и эта информаия может быть использована для активации контроля выхлопом, ЕГР, включением вентилятора охлаждения и пр.

    Датчик температуры обычно двухпроводной, использующий 5В опорный входной сигнал от ЭБУ мотора с сигналом «земли» обратнов ЭБУ.

    В основном если мотор холодный показания датчика составляют менее 0.5В, а когда мотор горячий могут быть в районе 4В. Однако вам необходимо уточнять интервал выходных значений по мануалу вашего автомобиля.

    Обратите внимание, что датчик ECT это не то же самое, что датчик температуры, который посылает сигнал на вашу приборную панель. (Тот обычно однопроводной и по сути аналоговый).

    ECT температурный датчик выглядит вот так:

    Если с датчиком температуры что-то не так, то вы можете увидеть следующие ошибки: P0115 — P0116 — P0117 — P0118 — P0119 — P0125 — P0126 — P0127 — P0128

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