F 550 4WD Super Duty V8-7.3L DSL Turbo VIN F (2001)
Engine Temperature Sensor: Description and Operation
Engine Coolant Temperature Sensor (ECT)
The Engine Coolant Temperature (ECT) sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a
thermistor decreases as the temperature increases, and increases as the temperature decreases. The varying resistance affects the voltage drop across
the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
The Engine Coolant Sensor is used as the primary input to the Electronic Control System to enable adaptive cooling. This provides a means of
providing adequate cooling in severe engine temperature conditions. When ECT is greater than 107°C (225°F), the fueling rate of the engine is
modified to provide cooling protection and prevent engine damage due to overheating.
