Question about 2006 Ford F-150

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Stuck in 4h and won't go into 2h - 2006 Ford F-150

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  • ChuckAndOdie Jun 04, 2010

    It may be wound up. Try putting it in neutral and then 4H. You may need to drive in reverse for several feet and then neutral before the solenoid can pull it out of 4L

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  • Master
  • 984 Answers

Sound like the vacuum line is off the IWE solenoid ( on the firewall ) or there is a problem with the vacuum reservoir ( behind the battery box ).

The IWE solenoid controls vacuum to the IWE ( Integrated Wheel Ends ) to pull the hubs out ( spring loaded to push in without vacuum ).

You can pull one of the IWE vacuum lines ( the other line is a vent that leads into the engine compartment and is open ) and test with a vacuum gauge when the switch is in the 2H position, you should have vacuum on the line.

If not, you will need to trace back the vacuum lines to find where the leak is at ( if it is what I think it is ).

This is a block diagram of the vacuum system to work from ( not the physical routing ).
stuck in 4h and won't go into 2h - 52db775.jpg

This is starting point, the other problems get into the IWE itself.

Posted on Jun 05, 2010

  • Steve S
    Steve S Jun 08, 2010

    Just thought of this, do you have a ESOF ( Electronic Shift on the Fly ) or MSOF ( Mechanical Shift on the Fly ) 4x4 system ?
    If it is ESOF, did you check the fuses, could be a blow fuse for the transfer shift motor.
    If you Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc ), apply vacuum to both front IWEs ( use vacuum pump where the T is for the vacuum line to both IWEs ), turn the key on, Disengage 4x4 and try to turn the front drive shaft.
    The wheels should not be engaged ( should turn freely with the vacuum pump, make sure it is holding the vacuum you apply with the pump ). I am suspecting that the symptom is the 4H indicator on the switch stays illuminated, and it is a case of the transfer case shift motor is not moving. If the fuse checks good with a meter on both pins on the back of the fuse while installed, next is to check the connector on the transfer case, the last is to slightly tap on the back of the transfer case with a dead blow hammer, to try to free up the motor.
    I think I went the wrong way with the 1st solution posting, as this would be a locked front axle, no symptom of this in the cab of the truck


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My problem was a failure in the 2H solenoid, it was not producing enough vacuum. The problem was intermitent at the begining and then was permanent.

I checked the solenoids in this way:
1) The solenoid that receives the vacuum in the botton is for 2H
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4) The default position when you disconnect the electronics is 4WD
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4WD should disengage if your 4H solenoid is OK, the ligths should now flash when you change from 2H to 4H because 4WD cannot engage because the pipes are switched. You can also check the vacuum of each solenoid with your finger on each one.

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Also check this address: http://4wd.blogeasy.com/article.view.run?articleID=318776

Good luck.

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