Often asked: What Does The Engine Coolant Temperature Sensor Do?

What happens when coolant temperature sensor goes bad?

If the coolant temperature sensor goes bad it can send a false signal to the computer and throw off the fuel and timing calculations. It is not uncommon for the coolant temperature sensor to fail and send a permanently cold signal to the computer. This will reduce fuel economy, and may hinder engine performance.

What are the symptoms of a bad temperature sensor?

What Signs May Signal Your Coolant Temperature Sensor May Be Failing?

  • Poor Fuel Economy.
  • Irregular Temperature Readings.
  • Black Smoke from Your Exhaust.
  • Your Engine is Overheating.
  • Your Check Engine Light is On.

Can I drive my car with a bad coolant temperature sensor?

Faulty readings from the coolant temperature sensor can cause your car’s engine to miscalculate the fuel to air mixture within the engine. If the amount of black smoke emitting from your car is excessive, then you should not drive your car and you should tow your vehicle to a mechanic.

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What is the function of coolant temperature sensor?

Coolant temperature sensors are used by the fuel management system to detect the engine’s operating temperature. Depending on the sensor information, the control unit adapts the injection time and firing angle to the operating conditions. The sensor is a temperature sensor with a negative temperature coefficient.

How do you know if your coolant temp sensor is bad?

Coolant Temperature Sensor Test

  1. Unplug the sensor electrical connector.
  2. Get the engine surface temperature using an infrared thermometer or suitable cooking thermometer.
  3. Take a note of the temperature reading.

How much does it cost to replace a coolant temperature sensor?

The average cost for engine coolant temperature sensor replacement is between $123 and $158. Labor costs are estimated between $82 and $104 while parts are priced between $41 and $54.

Does the coolant temp sensor control the fan?

The sensor works by measuring the temperature that’s being given off by the thermostat and/or the coolant itself. The temperature is then sent to the on-board control system. As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on.

How do you check a temperature sensor?

Connect the black lead of the meter to the body of the cold sensor and the red to the terminal. You should have a reading of approximately 2000 ohms. Check the warm sensor in your engine. You should see a much lower reading on the ohm meter.

What problems can a bad ECT sensor cause?

So, a faulty (ECT) sensor that always reads cold may; cause the fuel control system to run rich pollute and waste fuel. Also, a (ECT) sensor that always reads hot may; cause cold driveability problems such as stalling, hesitation and rough idle.

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Can a bad coolant temp sensor cause rough idle?

A faulty coolant sensor that always reads cold may cause the fuel control system to run rich, pollute and waste fuel. A coolant sensor that always reads hot may cause cold driveability problems such as stalling, hesitation and rough idle. This also affects engine performance and fuel economy.

How long does it take to replace a coolant temperature sensor?

The actual process of replacing the coolant temperature sensor is extremely simple. However, the difficult work comes in the preparation of the cooling system – both before and after. Tip: This job should only be completed when the engine is cold and has not been running for a minimum of one hour.

Can you run a car without a temperature sensor?

You may think your engine would overheat without a thermostat in place, but actually, the opposite is true. A car without a thermostat would never even warm to operating temperature, much less overheat. This will allow your engine to reach optimal operating temperature, improving gas mileage and performance.

When should a radiator fan turn on?

Your radiator fan should kick in at about 200 degrees Fahrenheit. If you notice your vehicle is overheating or at the very least running hotter than it normally does, listen for the fan to see if you can hear it.

How do you fix coolant temperature?

How to Replace a Coolant Temperature Sensor

  1. A video of this job being done is at the bottom of this guide.
  2. Release the Cooling System Pressure.
  3. Locate the Coolant Sensor.
  4. Remove the Electrical Connector.
  5. Remove the Coolant Sensor.
  6. Install the New Coolant Temperature Sensor.
  7. Refill the Cooling System.
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Can a temp sensor affect engine starting?

Bad coolant temperature sensor causes cold starting problems

But the owner had to pump the pedal to keep the engine running. That’s why pumping the gas pedal keeps your engine running. You can have a bad sensor even without a “check engine” light or trouble code.

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