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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5 >> Diagnostic Tests >> DTC P0128: Thermostat Function >> Diagnostic Procedure

Diagnostic Procedure

Remove Engine Coolant Temperature (ECT) sensor, and place in heated water. See Figure. Measure resistance between ECT sensor terminals (component side), with water at specified temperatures. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE . If resistance is not as specified, replace ECT sensor and retest system. 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.
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