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Will not shift into 4 wheel drive.

I can move the shift lever to put truck into 4 wheel drive but it does not engage and the 4x4 light does not come on.

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  • 4 Answers

Could be your transfer case

Posted on Oct 31, 2012

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Posted on Jan 02, 2017

  • 507 Answers

SOURCE: 1990 GMC Sierra 4x4 1500

the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.

Posted on Sep 22, 2008

  • 2 Answers

SOURCE: 4 wheel drive won't work

There is a vacum powered actuator on the front differential housing on the passenger side. It gets it's vacum from two valves mounted on the firewall just behind the battery(to left). The white line feeds manifold vacum to the valves. Check for vacum at white line with engine running. If no vacum there is a break in line from manifold. If vacum check the pink and blue lines by applying vacum to each one. The vacum should hold. If not check lines from valves to vacum actuator. Most likely it will be the actuator. If both lines hold vacum check valves. Remove electrical connectors from both valves. Connect a wire from one of the terminals of the valve to ground. Touch a wire from the battery + to the other terminal of the valve. Listen for a clicking sound. If no sound valve is bad. Replace valves(s). If this doesn't lead you to the trouble it's probably a mechanical problem inside the differential. However most likely there would other noises.

Posted on Jan 08, 2009

jonbrown725
  • 73 Answers

SOURCE: 2000 F350 Super Duty Will not go into 4 wheel drive

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

  • 1 Answer

SOURCE: 05 f150 4x4. 4 wheel drive lights come on but it is not engaged?

change actuator in front hub water gets in there freezez and ruber seal rips part only 120.00 bucks not hard to change beat upper ball joint take of spindle nut think it was 5/8 3 bolts in back should fall out

Posted on Jan 21, 2009

  • 1 Answer

SOURCE: 2002 kia 4x4 wont go into 4 wheel drive

Hello
A VERY COMMON FAULT!
Kia us a dim design that works on air, so the light on the dash may light up green...mine does...but no 4x4.
Test one, look inside the engine bay,(2Litre petrol) on your left hand side, to the left of the actual engine is the solenoid device that "switches on" the vacuum to the front hubs. This is easier that you would think. If you look at the left side of the engine, there are two pipes coming out (left side) one is thick (break system. DONT touch) one is thinner and soft rubber. Follow this tube, it goes into a small black cannister which is a resvoir and one way valve...the tube then outputs into another device (solenoid) which has 2 wires on. The tube then splits under this in two. The test is simple, with the engine running, and 4 wheel drive engaged pull the tube apart after the solenoid. Put your finger there you should feel a nice strong ****. If it does **** put it back on. If it does not **** it needs to be removed and cleaned. This is simple to unbolt and all you do is pull the rubber bung of the bottom, and the two tubes and spray break cleaner inside. reassamble until you get to feel the vaccum.

test 2 Now look behind each wheel, you will see a thick hose wrapped in a spring, this is the break system, do not touch this. There is a thinner flexible hose attached behind the wheel, you will notice that these have no securing system just push fit. Remove each of the in turn and test for vacuum.

Leaks here are common and easy to fix.

The bad news if you have vacuum, and still no 4 wheel drive one or both front wheel hubs has a leak, and the bad news is, it needs a garage to fix it, and to replace the seal a £5 part you have to ruin a £100 part.

Test the vaccum, pray. Otherwise ask, doe you really need to spend £250 to sort this?

Good luck

Posted on Mar 17, 2009

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1 Answer

1997 f150 4x4,the problem is the truck does not shift into 4-wheel drive even though the light on the dash says I am in 4 wheel drive????the truck has a manual transmission.


Do you pull a lever to shift into 4x4 or do you press a button on the dash for the 4x4, if it's the button type then more than likely the motor to engage the 4x4 is stuck, you will have to climb under the truck, and unplug it and clean the connections or tap the motor with a hammer to unstick it. It's a common problem, usually because the 4x4 isn't engaged very often. it should be checked for engagement every month or so, usually on loose gravel roads in the summer time.

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My 1994 gmc will not engage in 4x4


replace switch under truck, light may need replaced also, when you put shifter into 4x4 h, place your trans lever into drive, then move forward, 4x4 will engage.

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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

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1 Answer

How do I set car to be on 4x4?


I believe that Mitsubishi has one of the best and easiest 4X4 selector systems on the Pajero/ Montero. Just below the gear shifter lever is the 4X4 mode selector. A lever like the gear shifter that works in a up, down movement. On your dash board you will notice a sort of axle, chassis diagram in green light. In normal 2WD or 2H mode the lever is set all the way back and on the dash only the rear wheels a lite up in green light on the axle, chassis diagram. This is for normal driving on the highway and smooth roads of dry dirt roads. Pushing the lever up wards while moving at crawling speed will engage the light 4X4 mode which is 4H for when the driving gets a little slippery. All 4 wheels on the axle/ chassis diagram will be lite green. Shifting the lever from the 4H position to the left and upwards will engage the 4HLc mode for 4X4 on sand and deep snow. This will also engage the central diff lock which will show on the axle/ chassis diagram on the dash board with the center box also lite up. Further up from the 4HLc mode and while pushing down on the 4X4 lever push it to the top most position, but only do this when at a stand still with your foot on the brake pedal. This will engage the 4LLc mode with 4X4 and central diff lock on for when driving gets sweaty on thick mud up and incline. To disengage this mode stop, foot on break put it in P and then pull down the lever to one of the lower settings.

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2 Answers

Transfer case wont engage


shift into 4wd and move truck a couple of feet.
if light is still off, park truck block the wheels set the park brake jack right front wheel and try to hand spin the wheel if wheel doesn't turn 4x4 is functioning properly but there is a wiring problem use an ohmmeter to check the 4x4 switch wiring fuse and bulb
if wheel turns freely the front axle or transfer case is not engaged
attempt to hand spin the front driveshft if the driveshaft will spin the transfer case is not engaged check the transfer case shift linkage, problem is in linkage or transfer case internals
if the driveshaft will not spin the transfer case is engaged properly
with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
if no vacuum measured look for vac leak or bad vac switch
if both lines have vac look for a bad vac swithc or ruptured cad actuator diaphragm
if one line has 20" +- VAC
move transfer case lever to 2wd measure vac again lines should have swapped vac signals
if no vac switch bad or 4wd shift likage needs adjusting
if yes vac motor bad or stuck or shift fork stuck
remove vac shift motor from the axle attach vac lines to shift motor engage disengage 4wd
does shift motor plunger move at least 1/2 inch
no shift motor bad
yes check axle shift fork and vac motor for binging

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