Eclipse L4-1997cc 20L DOHC (1991) Engine Coolant Temperature Switch (A/C) Specs
Engine Coolant Temperature Switch (A/C): Description and Operation
Coolant Temperature Sensor
Coolant Temperature Sensor Circuit
The Coolant Temperature Sensor, located in the thermostat housing, is a thermistor type sensor. As engine temperature increases, sensor resistance
decreases. The ECU judges engine temperature by the sensor output Voltage and provides optimum fuel enrichment when the engine is cold.