Circuit/System Description
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The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT sensor signal circuit and a ground for the low reference circuit.
The following table illustrates the difference between temperature, resistance, and voltage:
| ECT | ECT Resistance | ECT Signal Voltage |
|---|---|---|
| Cold | High | High |
| Warm | Low | Low |