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The CTS is usually located in the lower intake somewhat close to the thermostat. Since the coolant temp is usually the same or higher then then temp of the lower intake the sensor is fairly accurate. on most body platforms there is seperate CTS sensor that runs the dash coolant temp guage.
The sensor is a thermosistor, as the coolant temp gets higher the resistance drops. The ECM supplies the sensor +5V and measures the voltage drop through the thermosistor to determine temperature. Some resistance vs temperature values follow:
*F--------Ohms
210----------177
158----------467
104----------1459
68------------3520
32------------9420
-4-------------28680
-40-----------100,700
The sensor is used for open/closed loop operation and is used in the calculation for fuel and ignition.
The sensor is a thermosistor, as the coolant temp gets higher the resistance drops. The ECM supplies the sensor +5V and measures the voltage drop through the thermosistor to determine temperature. Some resistance vs temperature values follow:
*F--------Ohms
210----------177
158----------467
104----------1459
68------------3520
32------------9420
-4-------------28680
-40-----------100,700
The sensor is used for open/closed loop operation and is used in the calculation for fuel and ignition.