Avalon XL V6-3.0L (1MZ-FE) (1997)
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Radiator Cooling Fan Temperature Sensor / Switch: Testing and Inspection
1. Drain engine coolant.
2. Remove Engine Coolant Temperature (ECT) switches.
3. Inspect No. 1 ECT switch.
(a) Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is above 98° C (208° F).
If there is continuity, replace the switch.
(b) Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is below 88° C (190° F).
If there is no continuity, replace the switch.
4. Inspect No. 2 ECT switch.
(a) Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is above 93° C (199° F).
If there is continuity, replace the switch.
(b) Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is below 83° C (181° F).
If there is no continuity, replace the switch.
5. Reinstall ECT switches.
6. Refill with engine coolant.
