Galant L4-2.0L SOHC (1989)
Engine Coolant Temperature Switch (A/C): Description and Operation
Temperature Sensor
The Coolant Temperature Sensor installed in the engine coolant passage of the intake manifold, is a resistor-based sensor. The ECU judges engine
temperature by the resistance change in the sensor. As the coolant temperature rises, the sensor resistance is lowered. With this input the ECU can
control fuel mixture when the engine is cold and determine if the engine is in closed or open loop.