Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1991SUPRA L6-3.0L DOHC TURBO (7M-GTE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1991 Toyota Supra L6-3.0L DOHC Turbo (7M-GTE)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1991 Toyota Supra L6-3.0L DOHC Turbo (7M-GTE)SECTION Description and Operation
Water Temperature Sensor (THW):
The Coolant Temperature Sensor, located on 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.