Prelude L4-1958cc DOHC (1989)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Fig. 34 Coolant Temperature (TW) Sensor And Characteristics Chart
The coolant temperature (TW) sensor is a temperature sensitive resistor (thermistor). The resistance of the thermistor decreases as the coolant
temperature increases. Engine temperature is used by the ECU to determine ignition timing, fuel injector duration, purge control, idle speed, and
EGR activation.
