Nissan_Armada_2004-2005

Coolant Temperature Sensor (CTS)/Engine Coolant Temperature (ECT) Sensor

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Operation



The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

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Fig. The engine coolant temperature sensor

Testing



The resistance of the engine coolant temperature sensor should be:



If the engine coolant temperature is 68°F, resistance should be 2.1-2.9 kohms.
 
If the engine coolant temperature is 122°F, resistance should be 0.68-1.00 kohms.
 
If the engine coolant temperature is 194°F, resistance should be 0.236-0.260 kohms.

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Fig. The engine coolant temperature sensor

 

 
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