Circuit Description

WARNING: This page is about a different car, the 2003 Toyota Matrix and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

For circuit description, see DTC P0115: ENGINE COOLANT TEMPERATURE CIRCUIT MALFUNCTION . Detecting conditions of DTC are:

When engine starts, water temperature is 20°F (-7°C) or less. And 20 minutes or more after engine starts, engine coolant temperature sensor value is 68°F (20°C) or less (2 trip detection logic).
When engine starts, water temperature is between 20°F (-7°C) and 50°F (10°C). And 5 minutes or more after engine starts, engine coolant temperature sensor value is 68°F (20°C) or less (2 trip detection logic).