DTC P0115: ECT Sensor Circuit
WARNING: This page is about a different car, the 2002 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
Engine coolant temperature is fixed at 104°F (40°C) when ignition is first turned on, then increases based on engine run time. After 4 minutes, ECT is fixed at 176°F (80°C).