Engine Coolant Temperature (ECT) Sensor
The ECT sensor monitors and signals the ECA of engine coolant temperature. This information is interpreted by the ECA as either cold or normal operating temperature. This information particularly influences ECA control of fuel mixture enrichment and EGR operation.
It is located in engine coolant heater supply tube at rear of 1.6L engine. See Fig 1 . On 2.3L Turbo engines, it is mounted on the top center of the fuel charging manifold assembly.