Question about 2002 Ford F-150

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There is no clicking when I turn the knob on the selector switch on my 2002 f150 fx4. It's running in 4 hi and will not shift into 2 or 4 lo. I've replaced the selector switch. What do I do next?

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  • Ford Master
  • 10,028 Answers

Look at the motor on the transfer case to see if there is voltage getting to it.. If there is, then the motor is bad.

Posted on Dec 13, 2016

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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autodr
  • 260 Answers

SOURCE: 1998 jimmy 4 wheel drive problem

are any of the lites on the switch flashing? you may have a sticking 4x4 shift motor on the transfer case. with a helper, key on someone under vehicle at shift motor, one operating the 2wd button, give shift motor a rap with small hammer on metal portion of shift motor to see if you hear it trying to work. to access control module, remove plastic right kick panel and its right there. remove connector and inspect for corrosion or bad connection. also try park and neutral, may even have to be rolling a bit to disengage. let me know how you make out and will help further if i can. do you know what transfer case system you have? np1 or np4?

Posted on Nov 23, 2008

cortez_marco
  • 58 Answers

SOURCE: in my 2004 F150 FX4, i replaced the idler pulley

check ur fuse relay box it might be out also check ur hot wires make shure they dont have touching the ground

Posted on Feb 18, 2009

flacooo1
  • 172 Answers

SOURCE: 4 lo working, 4 hi stopped working , A4WD never worked

Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer

Posted on Mar 30, 2009

sscullys
  • 984 Answers

SOURCE: 2002 f150 5.4 triton 160000 miles fx4 supercab

Sounds like the transfer case is signaling the GEM OK, but best to check it.
Jack up and support the front of the truck with jack stands ( and chock the wheels, normal safety precautions )
Turn the key to the on position ( do not start ).
Turn the switch to 4H, after the clicks are done and the cluster indicates 4x4, check the front drive shaft.

If the front drive shaft will not turn, it could be a problem with the vacuum motor or the vac solenoids, or the mechanics in the front axle.

If the front shaft will still turn, the problem is in the transfer case.

I am leaning towards the vac motor on the front, the vac lines, or the vac solenoids.

After the test above, lower the truck, start the truck ( wheels chocked, person have the parking brake on, and foot on the brake, safety precautions ) , and have someone turn the ESOF switch to 4H. The vac motor is the disc on the front axle. This should move when 4H is selected.
45e590e.jpg

You can check vac on the pink and blue lines.
Pink is 4WD vac on the hose.
Blue is 2WD vac on the hose.
Should be able to draw vac on the line, and have it hold with a mighty vac or other vacuum pump & gauge.

Posted on Dec 07, 2009

sscullys
  • 984 Answers

SOURCE: i have a 2002 ford

For the 2002 MY ( this is in the 2006 Section, just want to call it out to others that might find the solution, this does not apply to the 2006 MY )

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.

- 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.
{ picture of shift motor }
-- 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.
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_148.jpg

- If the front drive shaft turns:
For MSOF systems
-- Check that the shift linkage on the transfer case is moving when the lever is moved from 2W to 4H and 4L.

I am going to take a SWAG that it is 1 of 2 places, both cases the front drive shaft is locking into place.

1. The front vacuum shift motor is not moving ( vacuum or vacuum line issue ).
2. The contact plates for the shift motor are not making contact and are not signalling the GEM that the transfer case state has been changed.

I'd start with the front axle off the ground test, and see which way to go, before you start repalcing items.

Posted on Mar 28, 2011

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