Check your iwe switch behind your battery cost about twenty bucks its got wires and vacuum hoses check your vacuum hoses on the back side of your rotors
The IWE is the cheapest part to start with. The next part could be the Transfer case shift motor. If you can retrieve codes (DTC's) Code p1687 will tell you to check TSB's and SSM"s. This is all on my Bob Moore Ford repair sheet. They found TSB 06-9-8 and performed a resistance check on Transfer case shift motor was ouf tolerance. Replaced motor assy 8L3Z 7G360 A.
On
these issue, there are few solved help links for troubleshooting the
issue easily.-------
Click
the link below: ---
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
-----------
http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html
-------------
http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
--------------
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
------------
http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html
----------
http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
----------
http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html
----------
Traction
control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html
-----------
4WD light
flashing and 4WD will engage after few minutes
http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html
------------
http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html
----------
http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html
-------
-------------
http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html
----------
http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html
-------------
These
details will help.
Thanks.
4X4
On
these issue, there are few solved help links for troubleshooting the
issue easily.-------
Click
the link below: ---
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
-----------
http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html
-------------
http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
--------------
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
------------
http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html
----------
http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
----------
http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html
----------
Traction
control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html
-----------
4WD light
flashing and 4WD will engage after few minutes
http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html
------------
http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html
----------
http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html
-------
-------------
http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html
----------
http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html
-------------
These
details will help.
Thanks.
4X4
On
these issue, there are few solved help links for troubleshooting the
issue easily.-------
Click
the link below: ---
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
-----------
http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html
-------------
http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
--------------
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
------------
http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html
----------
http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
----------
http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html
----------
Traction
control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html
-----------
4WD light
flashing and 4WD will engage after few minutes
http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html
------------
http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html
----------
http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html
-------
-------------
http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html
----------
http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html
-------------
These
details will help.
Thanks.
On
these issue,there are few solved help links for troubleshooting the
issue easily.-------
Click
the link below:---
No 4x4 light on dash?
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
-----------
4X4 Truck makes roaring
noise in the front end?
http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html
-------------
Car will not go into 4WD
high or 4WD low?
http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
--------------
No 4x4 light on dash?
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
------------
4 wheel drive system will not disengage?
http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html
----------
4WD light is flashing and
beeping? NO 4WD high?
http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
----------
2002 Jeep Wrangler: 4WD Idiot Light is ON?
http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html
----------
Traction
control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html
-----------
4WD light
flashing and 4WD will engage after few minutes
http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html
------------
2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?
http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html
----------
4x4 front differential will not engage the
axle on ford?
http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html
-------
4x4 will not engage on Ford F150?
http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html
-------------
Dodge Ram 4x4
light keeps flashing
4X4 LOW LIGHT
IS FLASHING ON DASH
http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html
----------
Ford 4x4 front wheels will not engage?
http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html
-------------
These
details will help.
Thanks.
On
these issue,there are few solved help links for troubleshooting the
issue easily.-------
Click
the link below:---
No 4x4 light on dash?
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
-----------
4X4 Truck makes roaring
noise in the front end?
http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html
-------------
Car will not go into 4WD
high or 4WD low?
http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
--------------
No 4x4 light on dash?
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
------------
4 wheel drive system will not disengage?
http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html
----------
4WD light is flashing and
beeping? NO 4WD high?
http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
----------
2002 Jeep Wrangler: 4WD Idiot Light is ON?
http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html
----------
Traction
control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html
-----------
4WD light
flashing and 4WD will engage after few minutes
http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html
------------
2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?
http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html
----------
4x4 front differential will not engage the
axle on ford?
http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html
-------
4x4 will not engage on Ford F150?
http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html
-------------
Dodge Ram 4x4
light keeps flashing
4X4 LOW LIGHT
IS FLASHING ON DASH
http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html
----------
Ford 4x4 front wheels will not engage?
http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html
-------------
These
details will help.
Thanks.
513 views
Usually answered in minutes!
Most of the time, when I turn the 4x4 selector, Nothing happens. No light, no shift into 4x4 hi or low. But, some times when truck hasn't ran after night it will switch once or twice. Then it wont work again.
Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ? 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.
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