Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

- 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
- replace thermoswitch

If an acceptable value is obtained
- check for open circuit using wiring diagram