Tercel Sedan 2-Door L4-1456cc 1.5L SOHC (3E-E) (1991)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Water Temperature Sensor (THW)
The Coolant Temperature Sensor, located on the rear of the engine, monitors coolant temperature with a thermistor whose resistance varies according to
engine temperature. The ECU uses this signal to control open/closed loop operation of the fuel injection system, overdrive on electronic transaxles,
spark advance (ESA), idle speed control system and EGR system. The THW inputs the ECU through terminal THW.