Engine Coolant Temperature Sensors: Notes

Courtesy of JAGUAR CARS, INC.

The engine coolant temperature (ECT) sensors are negative temperature coefficient (NTC) thermistors that allow the engine control module (ECM) to monitor the engine coolant temperature.

There are two identical engine coolant temperature (ECT) sensors installed, which are identified as ECT 1 and ECT 2. Each sensor is secured with a twist-lock and latch mechanism, and is sealed with an O-ring. A two pin electrical connector provides the interface between the sensor and the engine harness.