Question about 2001 Ford F150 Styleside SuperCrew
Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.
If the front axle does not turn, the cause generally has to do with the Vacuum disconnect motor on the axle ( Item #10 in this picture ) :
Close Up :
The vacuum disconnect motor is operated by the vacuum axle disconnemy 2001 ford supercrew wont engage into 4 wheel - sscullys_12.jpg the firewall
You can test from here with a vacuum pump ( i.e. mightvac ) to see if the vacuum lines to the vacuum disconnect motor are good.
The pink vacuum line is 2WD operation, the Light Blue vacuum line is 4WD operation.
If the vacuum lines test good from here to the disconnect motor, and applying vacuum locks the front axle, it is either the vacuum solenoids, or the vacuum reservoir behind the battery, or the vacuum lines to the solenoids.
The solenoids have + VDC all the time, and the GEM applies ground to the correct solenoid to engage or disengage the front axle.
Posted on Nov 12, 2010
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Posted on Jan 02, 2017
Start the car
put in " N"
turn the 4X4 switch on
Then put in gear..
What do you see now?
Do the same in reverse when you take out of 4X4
Posted on Jan 19, 2009
Could be a problem with the vac lines to the IWE ( Integrated Wheel Ends ), or a problem with the IWE solenoid, or a problem with the vent from the IWE.
Start with checking the vac lines, to make sure they are not cracked.
The vac res & IWE solenoid are behind the battery. Here is a diagram of the parts in the IWE vac system
There was a TSB for the 2004-2006 MYs with a bad design IWE solenoid, but this usually was coupled with noise in 2WD.
Start with checking the VAC lines and the vent, next would be to check the IWE solenoid.
Here is the PDF of the TSB on IWE solenoid
Posted on Nov 28, 2009
There is a special sequence for that. Let me see if I can remember... Pull to a level surface, put the parking barake on, put the truck in neutral, shift to four-wheel drive, release the brake, shift to drive.
The computer waits for this sequence. It has been many years since I did this. If it doesnt work, call your dealer shop and they will tell you the correct sequence.
Posted on Dec 21, 2009
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