Visctronic Drive Fan (VDF )

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Ronald Long
6 years ago
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1 Page 1 of 9 Year = 2006 Model = F-Super Duty Engine = VIN = IDS Version = t Available Visctronic Drive Fan (VDF ) WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation. Failure to follow these instructions may result in personal injury or death. Signal Functions The VDF is an electrically actuated viscous clutch that consists of 3 main elements: a working chamber a reservoir chamber an actuator (electromechanical valve and speed sensor) The actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. The valve is activated via a pulse width module ( PWM ) output signal from the powertrain control module ( PCM ). By opening and closing the fluid port valve, the PCM can control the fan speed. Fan speed is measured through a Hall effect sensor, and is monitored by the PCM during closed loop operation. The PCM optimizes the fan speed based on the engine coolant temperature ( ECT ), engine oil temperature ( EOT ), transmission fluid temperature ( TFT ), intake air temperature ( IAT ), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase. Detection/Management During the key on, engine running ( KOER ) self-test, the PCM commands a 100% duty cycle. A diagnostic trouble code ( DTC ) is set if the PCM detects the voltage on the valve control circuit is not within the expected range or if the fan speed is less than a calibrated value. DTC Descriptions P0480 = Fan 1 Control Circuit P0528 = Fan Speed Sensor Circuit Signal This pinpoint test is intended to diagnose the following: VDF fan speed sensor harness circuits PCM

2 Page 2 of 9 Visctronic Drive Fan (VDF) Connector Harness Side Circuit Pin VPWR (Vehicle Power) 5 VDF (Visctronic Drive Fan) 4 VBPWR (Vehicle Buffered Power) 6 FSS SIGRTN (Fan Speed Sensor Signal Return) 2 FSS (Fan Speed Sensor) 1 Powertrain Control Module (PCM) Connector Harness Side Circuit VDF (Visctronic Drive Fan) VBPWR (Vehicle Buffered Power) FSS SIGRTN (Fan Speed Sensor Signal Return) FSS (Fan Speed Sensor) Pin E14 E46 E22 E6

3 Page 3 of 9 For DTC P0480, Go to AH4. For DTC P0528, Go to AH3. For all others, REFER to Section 4 Diagnostic Trouble Code ( DTC) Descriptions. Go to AH2. AH2 : CHECK THE COOLING FAN FOR MECHANICAL BINDING NOTE: The VDF is a viscous coupling. The viscous drag should be smooth during fan rotation. The amount of resistance is dependant upon the final VDF operational state before engine shutdown. Manually rotate the cooling fan. Does the fan clutch rotation feel rough or binding? INSTALL a new VDF. REFER to the Workshop Manual Section , Engine Cooling. Go to AH3.

4 Page 4 of 9 Manual Section , Engine Cooling for diagnosis and testing. AH4 : CHECK THE VDF SOLENOID RESISTANCE Cooling Fan Clutch connector disconnected. VDF Connector, Component Side VDF Connector, Component Side VPWR - Pin 5 VDF - Pin 4 Is the resistance between 6 Ohm - 10 Ohm? Go to AH5. INSTALL a new VDF. REFER to the Workshop Manual Section , Engine Cooling. AH5 : CHECK THE VDF SOLENOID FOR A SHORT TO GROUND VDF Connector, Component Side VDF - Pin 4 Is the resistance greater than 10 kohm? Go to AH6. INSTALL a new VDF. REFER to the Workshop Manual Section , Engine Cooling.

5 Page 5 of 9 AH7 : CHECK THE VDF SOLENOID CONTROL CIRCUIT FOR AN OPEN PCM connector disconnected. VDF - Pin 4 PCM Connector, Harness Side VDF - Pin E14 Is the resistance less than 5 Ohm? Go to AH8. REPAIR the open circuit. AH8 : CHECK THE VDF SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND VDF - Pin 4 Is the resistance greater than 10 kohm? Go to AH9. AH9 : CHECK THE VDF CONTROL CIRCUIT FOR A SHORT TO POWER Ignition ON, engine OFF. VDF - Pin 4 Is any voltage present? Go to AH19.

6 Page 6 of 9 Ignition ON, engine OFF. VBPWR - Pin 6 FSS SIGRTN - Pin 2 Is the voltage greater than 10.5 V? Go to AH15. Go to AH11. AH11 : CHECK THE VBPWR CIRCUIT FOR VOLTAGE VBPWR - Pin 6 Is the voltage greater than 10.5 V? Go to AH14. Go to AH12. AH12 : CHECK THE VBPWR CIRCUIT FOR AN OPEN PCM connector disconnected. VBPWR - Pin 6 PCM Connector, Harness Side VBPWR - Pin E46 Is the resistance less than 5 Ohm? Go to AH13. REPAIR the open circuit.

7 Page 7 of 9 VBPWR - Pin 6 Is the resistance greater than 10 kohm? Go to AH19. AH14 : CHECK THE FAN SPEED SENSOR FSS SIGRTN CIRCUIT FOR AN OPEN PCM connector disconnected. FSS SIGRTN - Pin 2 PCM Connector, Harness Side FSS SIGRTN - Pin E22 Is the resistance less than 5 Ohm? Go to AH19. REPAIR the open circuit. AH15 : CHECK THE FAN SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN PCM connector disconnected. FSS - Pin 1 PCM Connector, Harness Side FSS - Pin E6 Is the resistance less than 5 Ohm? Go to AH16. REPAIR the open circuit.

8 Page 8 of 9 Go to AH17. AH17 : CHECK THE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Ignition ON, engine OFF. FSS - Pin 1 Is any voltage present? Go to AH18. AH18 : CHECK THE SIGNAL CIRCUIT FOR VOLTAGE PCM connector connected. Ignition ON, engine OFF. FSS - Pin 1 Is the voltage greater than 10 V? INSTALL a new VDF. REFER to the Workshop Manual Section , Engine Cooling. Go to AH19.

9 Page 9 of 9 INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

HV: Cooling Fan Clutch

2009 PCED Gasoline Engines SECTION 5: Pinpoint Tests Procedure revision date: 12/10/2008 HV: Cooling Fan Clutch HV: Introduction HV1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) Are DTCs P0480, P0483 or P0528