5000S Wagon L5-2309cc 2.3L SOHC (NF) (1988)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
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disconnect thermoswitch harness connector from thermoswitch and measure resistance between terminals of switch
Checking specification if switch temperature is:
below 20°C (68°F) = Zero ohms (continuity)
over 40°C (104°F) = Infinite ohms (open)
If an acceptable value is NOT obtained
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replace thermoswitch
If an acceptable value is obtained
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check for open circuit using wiring diagram