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DTC P1126: Thermostat Function: Procedure

Remove ECT sensor. See Figure. Measure resistance between ECT sensor terminals, with sensor at specified temperatures. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE  table. If resistance is not as specified, replace ECT sensor. If resistance is as specified, test is complete.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature - °F (°C) (1) Ohms
68 (20) 2100-2900
122 (50) 680-1000
194 (90) 236-260
(1) Resistance should decrease as temperature increases. See Figure.