Will Engine Coolant Temperature Sensor Keep Car from Starting?

What is an Engine Coolant Temperature Sensor?

An engine coolant temperature sensor (ECT sensor) is a device that measures the temperature of the engine coolant. This information is then sent to the engine’s computer (ECU), which uses it to adjust the engine’s operation. The ECT sensor is a critical part of the engine’s cooling system, and it helps to ensure that the engine runs at the correct temperature.

Can a Faulty ECT Sensor Keep a Car from Starting?

In most cases, a faulty ECT sensor will not prevent a car from starting. However, there are some exceptions to this rule. For example, if the ECT sensor is completely disconnected or if it is sending a false reading to the ECU, it can cause the engine to run too rich or too lean. This can make it difficult for the engine to start, and it can also damage the engine.

Symptoms of a Faulty ECT Sensor

There are a number of symptoms that can indicate a faulty ECT sensor. These symptoms include:

Difficulty starting the engine
Engine running too rich or too lean
Engine overheating
Check engine light illuminated

Diagnosing a Faulty ECT Sensor

If you suspect that your ECT sensor is faulty, you can diagnose the problem by using a multimeter. To do this, you will need to disconnect the ECT sensor from the engine harness and then measure the resistance between the two terminals. The resistance should be within the range specified by the manufacturer. If the resistance is not within the specified range, the ECT sensor is faulty and should be replaced.

Replacing an ECT Sensor

Replacing an ECT sensor is a relatively easy task that can be completed in about 30 minutes. To replace the ECT sensor, you will need to:

Disconnect the negative battery terminal.
Locate the ECT sensor. The ECT sensor is usually located on the engine block or cylinder head.
Disconnect the ECT sensor from the engine harness.
Remove the ECT sensor from the engine.
Install the new ECT sensor.
Connect the ECT sensor to the engine harness.
Reconnect the negative battery terminal.

Conclusion

A faulty ECT sensor can cause a number of problems, including difficulty starting the engine, engine running too rich or too lean, and engine overheating. If you suspect that your ECT sensor is faulty, you can diagnose the problem by using a multimeter. If the ECT sensor is faulty, it should be replaced.