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ECT Sensor
Scan tool range
-40°C to +151°C, -40°F to +304°F. The Engine Coolant Temperature
(ECT) sensor is mounted in the coolant stream. The
PCM applies
5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.