Question about 1993 Ford Bronco

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4wd won't work axles turn electronic box engages front tires won't lock in

4wd won't engage electronic box is on and functioning all axles turn. Everything seems fine except front tires won't turn.

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  • crackerswamp May 23, 2009

    front shafts do turn when truck is on a lift but the tires do not,everything says and indicates it's in 4wd front tires simply do not rotate.thank you so much for your help.

  • Anonymous Mar 26, 2014

    when turning the tires the front tires are grabbing

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Have you checked to ensure that the actuator is working? if the actuator isn't working then the ring gear wont engage and won't turn the front shafts. try turning your key to accessory and put the truck in 4wd

Posted on May 23, 2009

  • xtouchxofxre May 23, 2009

    listen for the buzzing sound

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Posted on Jan 02, 2017

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On my 01 grand vitara i changed the 4wd pump behind the bumper the indicator light for 4wd now comes on but 4wd still does not engage


what does engage mean.? it fails on ICE or DIRT

engaged, means, (mechanically) one tire front and rear have traction

with LSD front and rear all 4 have traction and spin on ice

does it?

part time 4wd dont work on dry pavement so that is my 1st question

why not state, what you are driving on, and what does engage means

by what means did you check engaged.????



this car is not AWD, do you know the difference from AWD and

Part time 4wd? the diff, is there is center differential. on part time

so must be (true test) tested on ice, or dirt.



see the videos here, or a demo.

or on ice. ice you will see front and rear both working,

on dry plave ment all you get is windup... very very bad to do

in traffic, causing you to wreck and other to get , hurt.

if you understand all that, then do say what you mean

ENGAGED.

if you know what windup is and it dont, then you are correct

its not engaged. (jack left front tire up, engage it and feel it? by turning the the tire, it must fight you)

front up, rear down. in 4wd.

here it it is again.

http://www.fixkick.com/part-time-test.html



if it dont engage for real,. may i introduce you to the FSM

its in my hand now.

page 3B-3 . see it?

switch closes in xfr case

ECU sees that and powers up the air pump.

if pressure is good the Ecu is told that, if wrong you get scanned DTC code saying just that (obd2 scan too)

the pump has 2 shut off modes, good pressure. and fails to hold for 10seconds. (prevents pump from running all time)

if all the above works the Lamp glow by PCM command.

if you have full pressure , the lock in the front axle is now locked

no pressure, no lock yes full pressure it must lock or the axle

actuator is bad.

the page 3B6 says pressure is 4.25 to 6.40

page 3b10 is the acutator test. and the TRUE ENGAGE TEST

front wheels off ground.

apply 4.2psi with shop air and reg.at the acutator nipple

1: you spin one tire, the other spins backwards (GOOD test)

kill the 4.2 psi supply air

2: you spin one tire.

and the other tire, does nothing, (remains stationary)

pass. test 2.



test one is locked

test 2 is 2wd.



the other tests are on ice or dirt.

does that help?

Jan 05, 2014 | 2001 Suzuki Grand Vitara

1 Answer

Four wheel drive actuator


I would try taking the right tire and cv axle off there next to the oil pan is a part that the axle slides through.it has a connector that engages the axle or 4x4 but if it is dry it will need to be replaced or checked out.it is kind of hard to take all of that off but check it out

Dec 09, 2013 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

2003 gmc envoy 4x4 problems. 4200 vortec engine. my front diff doesnt seem to be working


Look under there and see, but I think they (the hub locks) are engaged by vacuum motors.

May 18, 2017 | 2003 GMC Envoy

1 Answer

I have a 2000 yukon xl, 4wd won't engage, rebuilt transmission and transfer case. the vehicle is on hoist, put in drive and engage 4wd, cannot turn front drive shaft by hand, seems in gear, new...


Check the 4x4 wiring ground (directly behind the left front tire, mounted to the body). If the front axle actuator is still good, this is usually the source of frustration. Put some RTV Gasket sealer on the nut and bolt after you replace them to help keep it from corroding as fast.

Sep 25, 2017 | Cars & Trucks

2 Answers

Got. A 2003 f150 4x4 got problems with 4 wheel drive locking in and stay in drive shaft turning front wheels not


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).

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 ( this is what you seem to have, the transfer case is engaged and will drive the front shaft mine was a key on engine off test ).

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
sscullys_185.jpg
-- If the vacuum shift motor does not move:
1.Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
2.Check the fuses for the 4WD system and the solenoids.
3.Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
sscullys_187.jpg
4.Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
5.Check the vacuum reservoir box for cracks.
6.Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
7.Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_186.jpg

Usually the case is cracked vacuum lines from the solenoids, the next common is a cracked vacuum reservoir box, and 1 time I have seen the mount for the vacuum disconnect motor broken ( motor floating free so it could not push against the axle )
sscullys_188.jpg

Aug 28, 2011 | 2003 Ford F150 Regular Cab

1 Answer

2005 Trailblazer XT won\'t go into 4WD. Front hubs don\'t engage with switch in cab. It will gear down to 4wd Lo but front wheels won\'t engage. Please help. Can\'t afford the dealer!


i've been told it was the 4wd actuator located on the passenger side near were the cv joint goes in to the front axle a good test is to floor jack it up so both wheels are off the ground and have someone on the other side , put in nutrual turn both wheels one way at same time and the 4wd drive shaft should turn if not its your actuator, costs about $86 for anew actuator and takes about 5 mins to change once you have the tire off

Feb 11, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

1997 GMC Suburban electric 4WD will not engage 4WD


Check the actuator cable that activates the front axle disconnect. It is bolted to the inner fender and the cable runs down to the axle. If you apply vacuum it should pull in and shift the interlock. To see if it is working, jack up the right front so the tire clears. The tire should rotate pretty free. Now engage the interlock. The tire should become harder to turn and the front drive shaft should turn. Now engage the 4X4 (with the trans in park) and see if you can still turn the tire. You shouldn't be able to turn it with the interlock activated.

Keep us upodated (remember to rate this answer).

Dec 22, 2010 | 1997 GMC Suburban

1 Answer

1997 Ford F-150 4x4: Electronic four wheel drive will not engage. Was working then wouldn't engage when it was below 32 degress. But once warmed up would engage. But now it will NOT engage at all. The...


Lift and support the front of the truck so the front wheels are off the ground.
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.

There are the two lines that operate the diaphragm on the axle. Facing the truck, the right solenoid (pink & black lines) is activated to disconnect the axle and go back into 2WD. The left solenoid (blue & white lines) lock the axle into 4WD

you'll have to get a vacuum source like a Mighty-Vac hand pump and apply vacuum to the pink and blue lines, one at a time. If one leaks down you'll have to check the line, including the diaphragm, to locate the leak. If vacuum was held, reconnect the bottom half of the line "connector" (black & white lines) to the solenoids and crank the truck. Switching from 2WD to 4WD and back verify each time that there is vacuum on the top nipple of the activated solenoid. If you're in 2WD the right solenoid (pink/black) should be sucking, in 4WD the left (blue/white) should be. If these operate as described then you axle shift fork may be bad. If you're not getting vacuum when you should be, replace the solenoid.

The Vacuum shift motor ( item #10 in the diagram )
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Close up :
1e0f2ad.jpg\

Vacuum shift solenoids

2eae686.jpg

The other source of the vacuum leak ( if the lines to the solenoid test good ) is the vacuum box behind the battery.

Oct 17, 2010 | 1997 Ford F150 Regular Cab

1 Answer

2003 f150 crew 4wd Lost 4WD tranfer case locks


Lift and support the front of the truck so the front wheels are off the ground.
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.

Nov 30, 2009 | 2005 Ford F-150

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