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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 124 (Engine Controls - Description And Operation -- 6.0L Diesel (99P F450/550)) >> Diesel Powertrain Control Module (PCM) Inputs >> Fan Speed Sensor (FSS)

Fan Speed Sensor (FSS)

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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.

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