F 450 2WD Super Duty V8-6.0L DSL Turbo VIN P (2006)
Radiator Cooling Fan Speed Sensor: Description and Operation
FAN SPEED SENSOR (FSS)
The FSS is a Hall effect sensor integral to the visctronic drive fan (VDF). The PCM monitors the sensor input and controls the VDF speed based upon
the engine coolant temperature (ECT), the transmission fluid temperature (TFT), and the intake air temperature (IAT) requirements. When an increase in
fan speed for vehicle cooling is requested, the PCM monitors the FSS signal and outputs the required pulse width modulated (PWM) signal to a fluid
port valve within the VDF.
