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1. Remove the sensor from the engine.
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2. Heating up a vessel with water and the sensor located in it, check its resistance.
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Temperature
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Resistance
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0 ° C
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5,9 kiloohms
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20 ° C
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2,5 kiloohms
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40 ° C
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1,1 kiloohms
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80 ° C
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0,3 kiloohms
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3. If resistance of the sensor differs from demanded, replace the sensor.
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If it is not enough increase in frequency of rotation of idling of the cold engine or at engine warming up the fulfilled gases have dark color, the sensor of temperature of cooling liquid can be the reason of it.
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