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Coolant Temperature Switch (GS300 & LS400)

Using a DVOM, check for continuity between coolant temperature switch terminals. See COOLANT TEMPERATURE SWITCH CONTINUITY  table. If coolant temperature switch continuity is not as shown, replace switch.

COOLANT TEMPERATURE SWITCH CONTINUITY

Temperature Continuity
GS300 
Less Than 190°F (88°C) Yes
Greater Than 207°F (97°C) No
LS400 
Less Than 181°F (83°C) Yes
Greater Than 199°F (93°C) No