Question about Ford F-150
4 wheel drive not working when switched to 4x4
Posted by Anonymous on
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Posted on Jan 02, 2017
I have recently had this problem with a customer. It seems the 4x4 low will only engage in neutral with the brake applied. And also check fuse. Then select drive and you will feel it lock in. Don't "goose" the fuel when attempting this.
Posted on Jan 14, 2009
I have a 2002 chevy trailblazer 4x4 control light not working. when trying to switch from 2wd to 4wd nothing happens. no ligth no engaging of the drive
Posted on Jan 28, 2009
Encoder motor located on the transfer case is usually the problem. It is the motor that shifts the transfer case.
Posted on Sep 28, 2009
Testimonial: "Will look into this and report .Thanks so much"
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
Posted on Dec 20, 2009
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