Previa Van 4WD L4-148.8 2438cc 2.4L DOHC (2TZ-FE) (1991)
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Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Water Temperature Sensor (THW)
The Coolant Temperature Sensor, mounted in the water outlet at the front 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.