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To test the Engine Coolant Temperature (ECT) sensor on a 2.2L Ecotec engine, first, locate the sensor, which is usually found near the thermostat housing. Use a multimeter to check the resistance of the sensor at various temperatures, comparing your readings to the manufacturer's specifications. Additionally, you can monitor the ECT sensor's output voltage using a scan tool or multimeter while the engine runs to ensure it changes appropriately with temperature. If the readings are outside the specified range, the sensor may need replacement.

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1w ago

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