Question about Ford F-150

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1997 f 150 4.6 4x4 four wheel stuck in 4x4 high want shift out. replaced switch checked fuses pulled harness apart clean ?? maybe solenoid?

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So the truck has on the fly 4X4? Switch on the dash? If not and you have the leveler on the floor that you pull it into 4WD then the solenoid located on the front axle is sticking its located behind a black plastic cover remove the two 10mm bolts and spray the it down with WD 40 you might have to tap it and have someone pull it in to 4WD or you could replace it. Depends on how much you want to spend.

Posted on Jul 31, 2010


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Lights come on the dashboard but the four wheel drive will not engage in high or low

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vacuum 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 vacuum lines from the IWE. The spring should push the gears in, without the vacuum 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 vacuum 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.

- If the front drive shaft turns:
•Check the fuses for the 4WD system ( If ESOF system ) . These are #11, #29, #30 and #111. Use a meter to check the fuses while plugged in, there are pins on the back of the fuse for this. Use a known good ground and check each side of the fuse with the other meter probe, with the meter set to V-DC ( check the scale if a setting that it will read at least 13 V DC ).
•With the key on, if the ESOF system have someone turn the mode selector from 2WD to 4WD while hitting the transfer case with a dead blow hammer ( do not use a metal hammer, it can damage the transfer case ). Some times the shift motor will get stuck ( lack of use ? ) and the dead blown hammer will free it up.
•There are 2 relays ( in the small engine compartment fuse / relay panel - ESOF only ) for the 4WD system, one is the CW ( **** Wise ) one is the CCW ( Counter Clock Wise ). These are full size relays, that can be bench tested, or a quick remove and replace test with the high beam relay in the cab fuse panel ( Relays R03 ). 1 at a time, remove the CW & CCW relays and install them in the position for the high beam relay, and test the high beams by pulling back on the MFS ( MultiFunction Switch ). If the high beams work with both relays, the CW & CCW relays are not the issue ).
•Check the connector on the transfer case for the shift motor, to make sure it is not corroded.

Block diagram of the IWE system

Feb 10, 2011 | 2004 Ford F150

1 Answer

Wont shift into 4 wheel high

check four wheel drive fuse transfer case switch stuck(common problem) or transfer case encoder module

Jan 01, 2011 | 2001 GMC Jimmy

1 Answer

96 Chevy Blazer will not shift into 4 wheel high. Had it on a lift and it will shift into 4 wheel high low but nothing on the dash or at solenoid on 4wd high. I removed harness and saw no corrosion. ...

on the top side by where the front drive shaft comes out of the transfer case there is a vacuum switch with 3 vacuum lines going to it that needs replaced if im thinking right ..... replace switch and ur fixed........hope it helps

Nov 22, 2010 | Chevrolet Blazer Cars & Trucks

1 Answer

1999 Chevy Suburban 1500 stuck in 4 wheel drive.

Check the wire harness on the transfer case to make sure it's still plugged in. Check the selector switch in the dash. Check the hub sensor wire harnesses on the front wheels.
Check for error codes through OBD-II connector under the dash.
Good luck.

Feb 14, 2010 | 1999 Chevrolet Suburban

1 Answer

No rear parking lights

Do the rear turn signals work ?

Does the CHMSL ( Center High Mount Stop Lamp ) work ?

Did you check the fuse ? ( cab fuse panel Fuse #13 )

Could be 1 of 2 things.

1. If the CHMSL works Time to check the connector at the base of the steering wheel column. Try tilting the steering wheel all the way up, and see if it changes. If so, the connector at the base of the steering wheel column is starting to pull apart. Remove the knee panel ( bottom of panel has 3 (?) screws, by the base, look for a large connector 16 pin black connector ( some were white ). Press the connector tab, and pull the connector apart, and check the pins for discoloration. Clean if required ( type writer eraser works some times ), reassemble the connector ( if pulled apart, tab could be broken, might need to zip tie it together. zip tie the harness towards the truck ( not up the steering wheel column ) to the bracket for the knee panel, so it cannot pull back again.

2. If the turn signals work, but CHMSL does not and fuse is good, time to check the brake switch on the brake pedal. This should also have a problem with getting the truck out of park after starting, as this is also the shift interlock. You do not list this, so I imagine this is not the case.

Oct 30, 2009 | 2003 Ford F150 Regular Cab

2 Answers

I have 1997 gmc jimmy sl5 it will not shift out of 4 hi

sounds like you have an issue with the motor on the transfer case. these do go bad quite often

May 21, 2009 | 1997 GMC Jimmy

2 Answers

4x4 wont engage

the motor on the back of the transfer case may be stuck knock on the motor lightly with a hammer when switching the the switch May need a motor

Mar 03, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

1999 chev sivlerado 1500 pickup stuck in four wheel high mode

Had the same problem. Easy fix. Grasp the plastic dashboard piece that goes around the instrument cluster and 4 wheel drive switch and pull off. Remove the 4 wheel drive switch. Unplug wiring harness from back of switch. use small screwdriver and carefully bend all metal tabs in back of switch slightly to one side. Re-install harness and switch back into dash. Should work fine, it just was not getting a connection. Worked great for me.

Jan 18, 2009 | 2000 Chevrolet Silverado 1500

4 Answers

2001 Chevy Blazer 4 wheel drive

The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.

Jun 02, 2008 | 2001 Chevrolet Blazer

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