Mirage L4-1795cc 1.8L SOHC 16 Valve (1995)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
DESCRIPTION
The engine coolant temperature sensor converts the coolant temperature into a voltage and inputs it to the engine control module, which then
controls the fuel injection rate and fast idle speed when the engine is cold, based on the input signal.
OPERATION
The 5V power in the engine control module is supplied via a resistor in the module to the engine coolant temperature sensor. Via the sensor which
is a kind of resistor, it is then grounded in the engine control module. The engine coolant temperature sensor resistor has such characteristic that its
resistance decreases as the coolant temperature rises.
The engine coolant temperature sensor terminal voltage increases or decreases as the sensor resistance increases or decreases. Therefore, the
engine coolant temperature sensor terminal voltage changes with the coolant temperature, decreasing as the temperature rises.
