Question about 2006 Ford F-150
What can I check
Sounds like a 4wd actuator relay.
Posted on Dec 26, 2008
My truck did the same, it was the seleniod and the motor that changes it to 4x4 that was bad. I could tap on the seleniod underneath the truck and it would work.
Posted on Jan 31, 2009
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Posted on Jan 02, 2017
SOURCE: 2005 f-150 4x4 not engaging
First of all, the problem was caused by lack of use of the 4x4. The fix was to have someone sit in the seat & turn the switch while 2nd person tapped on 4x4 solenoid underneath the truck (next to the gearbox (seen from rear of truck) about directly below middle-rear-seat). It must have become stuck (or rusted) together? Little taps while engaging switch 'unfroze' it. My 2 fuses that were blown were probably caused by overloading when I first tried to use the 4x4 while it was frozen out. Since fixing, just be sure to turn it on (and off) frequently, even if you don't need it. You don't actually need to drive with it, just engage it temporarily.
Posted on Jan 01, 2009
SOURCE: Dash selector does not engage
Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.
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 drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.
Here is a block diagram of the IWE system
If the front drive shaft turns, it is either the connector to the transfer case or the transfer shift motor not functioning correctly.
Check the connector for corrosion on both the male and female pins.
Turn key to run ( do not start ) and have someone turn from 2WD to 4H and back again while hitting the transfer case with a dead blow hammer ( not a steel hammer ) to see if the shift motor is hanging up.
Not sure if selector does not engage 4x4 hi or 4x4 low means the lights on the mode selector switch do not change, or if the switch selects 4H, but the front wheels do not function, so hard to provide a true direction on where the problem could be.
Posted on Dec 13, 2010
THE 4X4 LOW IS A VACCUME SYSTEM. PLACE GEARSHIFT IN NEUTRAL. TURN TO 4LOW AND PUT FOOT ON BRAKE. GIVE IT ABOUT 5 SECONDS. SHOULD ENGAGE.
Posted on Sep 15, 2009
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