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The coolant temperature sensor is used to measure the temperature of the engine coolant of an internal combustion engine. The readings from this sensor are then fed back to the Engine control unit (ECU), which uses this data to adjust the fuel injection and ignition timing. On some vehicles the sensor may also be used to switch on the electric cooling fan. The data may also be used to provide readings for a coolant temperature gauge on the dashboard. == Types of sensor == As the sensor's temperature changes, its resistance changes accordingly. Depending on the type of sensor, the resistance will either increase or decrease. * In negative temperature coefficient (NTC) sensors, the internal resistance will ''decrease'' as the temperature ''rises'' (and vice versa). * In a positive temperature coefficient (PTC) sensor, the opposite is true. Its resistance will ''increase'' with ''rising'' temperature. Most automotive coolant temperature sensors are NTC sensors. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Engine coolant temperature sensor」の詳細全文を読む スポンサード リンク
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