Engine Coolant Temperature Sensor
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota RAV4, 2002 Toyota Highlander, 2002 Toyota Camry, 2002 Lexus RX 300, and 2001 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
Engine coolant temperature sensor delivers input signal to ECM, indicating engine coolant temperature. ECT sensor is located at right rear corner of engine, near upper radiator hose.