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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van SPONSORED BY:

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Old 11-11-2009, 01:42 PM
c04678 c04678 is offline
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Pulse Vacuum Hub Solenoid Valve Testing

Does anyone know what voltage I should be getting to the PVHS? There are 3 wires going to it. With 4WD off I get 12v to the middle pin. When I turn on 4WD the voltage stays the same on the middle pin. I'm trying to decide if I need to replace it or not.
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Old 11-11-2009, 02:25 PM
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dchamberlain dchamberlain is offline
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There is always voltage to pin 2 with the key on. Pin 1 is grounded to lock the hubs, pin 3 is grounded to unlock the hubs. Vacuum is applied to the hub for only about 15 seconds. A stronger vacuum pulse is used to lock the hubs and a weaker one to unlock them.
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2002, 2004, 4wd, 4x4, f250, ford, hub, hublock, lock, pulse, replacement, solenoid, test, vacuum, valve

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