Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
Remove ECT sensor, and place in heated water. For location, see Figure . Measure resistance between sensor terminals, with water at specified temperatures. See ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE table under DIAGNOSTIC PROCEDURE under DTC P0117 OR DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR. If resistance is as specified, test is complete. If resistance is not as specified, replace ECT sensor.