Astro Van L AWD V6-262 4.3L VIN Z (1994)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Engine Coolant Temperature (ECT) Sensor Circuit
NOTE: Because different models and engine applications vary in wire colors, circuit numbers, and pin numbers, the above image is a typical example.
Refer to COMPUTERS AND CONTROL SYSTEMS/SCHEMATIC AND ROUTING DIAGRAMS for specific schematic applications.
PURPOSE:
The Engine Coolant Temperature (ECT) sensor is a thermistor that is located in the engine coolant flow. When the coolant temperature is low, the sensor
produces a high resistance. When the coolant temperature is high, the sensor produces a low resistance.
The control module sends a 5 volt signal to the ECT through a resistor in the computer and measures the voltage. The voltage will be high or low
depending on coolant temperature. By varying the voltage the computer can determine engine coolant temperature.
