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COOLANT TEMPERATURE SENSOR

Description

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.

 

Typical Wire Diagram

Component Inspection:

Check resistance between engine coolant temperature sensor terminals 1 and 2, as the temperature increase the resistance should decrease.
  
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