Emission Control Engine Coolant Temperature Sensor

The Emission Control Engine Coolant Temperature Sensor, also known as the ECT sensor, is a component of the vehicle's engine management system. It is responsible for monitoring the temperature of the engine coolant and providing this information to the engine control unit (ECU).

The ECT sensor is typically located near the engine coolant outlet or in the cylinder head. It consists of a temperature-sensitive resistor or thermistor that changes its resistance based on the temperature of the coolant. As the coolant temperature increases, the resistance of the ECT sensor decreases, and vice versa.

The ECU uses the information from the ECT sensor to make adjustments to the fuel injection timing, air-fuel mixture, and ignition timing. This helps optimize the engine's performance, fuel efficiency, and emissions control.

In addition to its role in engine management, the ECT sensor is also used by the vehicle's onboard diagnostics system to detect and diagnose potential issues related to the engine coolant temperature. For example, if the coolant temperature is too high or too low, it may indicate a problem with the cooling system or thermostat.

Overall, the Emission Control Engine Coolant Temperature Sensor plays a crucial role in maintaining the proper operation and efficiency of the engine, as well as ensuring compliance with emissions regulations.