The engine coolant temperature sensor resistance changes in response to engine coolant temperature. The sensor resistance decreases as the surrounding temperature increases. This provides a reference signal to the PCM, which indicates engine coolant temperature.
The ECT sensor is mounted on the lower intake manifold near the water outlet/thermostat housing, except on 2.3L and 2.5L engines. On the 2.3L and 2.5L engine the ECT is mounted on the water outlet/thermostat housing.
| Fig. 1: Typical Engine Coolant Temperature (ECT) sensor
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