Engine Coolant Temperature (ECT) Sensor - What You Need To Know
Engine Coolant Temperature (ECT) Sensor – What You Need To Know

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Engine Coolant Temperature (ECT) Sensor – Function – Failure And Testing

Engine Coolant Temperature Sensor (ECT) Replacement – How To Do It


So, An engine coolant temperature (ECT) sensor, is used to measure the temperature of the coolant. Consequently, Giving an indication of how much heat the engine is giving off. Furthermore, The sensor works with the vehicle’s (ECU), continually monitoring the temperature of the coolant. Finally, Making sure the engine is running at the optimum temperature.

So, To get an accurate reading of the current engine temperature, the (ECU) sends a regulated voltage to the (ECT). Consequently, The resistance of the sensor varies with temperature. So, This is how the (ECU) can monitor temperature changes.

Finally, The (ECU) uses this reading to:

  • Calculate the temperature of the coolant
  • Adjust the fuel injection
  • Control fuel mixture
  • Adjust ignition timing
  • Controls when the electric cooling fan is switched on and off
  • Send an accurate reading of the engine temperature to a gauge on the dashboard

But, Like any component under the hood, (ECT) sensors can develop faults over time. A faulty sensor can lead to a range of problems developing, including overheating and poor engine performance. That’s why it’s important to know how to spot the signs of a faulty or failing temperature sensor. Before, It can cause further problems which could prove more expensive to fix.

Start by having a look at the unit itself to check its condition. Because, As sensors/gaskets/connectors can develop cracks with extended use and continual temperature cycling. While a visual check can help to diagnose some faults, not all problems with a (ECT) show visible symptoms.

Finally, If your vehicle has starting problems and the “check engine” light doesn’t come on; you may have a bad engine coolant temperature sensor (ECT).

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