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

(ECT) Coolant Temperature Sensor – What Can Go Wrong


So, An Engine Coolant Temperature 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; 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. 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 (ECT) sensor.

Thank You !