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Starter Switch Signal <--> [Cranking Signal] > < Coolant Temperature Sensor/Switch (For Computer)|Specifications|Page 1672

Civic Hatchback L4-1493cc 1.5L SOHC (D15B1) TBI (1990)

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Coolant Temperature Sensor/Switch (For Computer): Description and Operation

Fig. 34 Coolant Temperature (TW) Sensor And Characteristics Chart

The coolant temperature (TW) sensor, located in the cylinder head just below the distributor, 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.

Starter Switch Signal <--> [Cranking Signal] > < Coolant Temperature Sensor/Switch (For Computer)|Specifications|Page 1672