No 4 Wheel Drive
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Laughing Gas
Joined: Aug 2017
Posts: 905
Likes: 37
No 4 Wheel Drive
When i turn the switch to 4h or whatever nothing happens no lights or anything. When i turn the key to on the light for 4x4 comes on but nothing with the switch happens, i swapped the switch out with a known good one and still nothing happens.
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
Looking at the owners manual for 2003 f350 fuse 111 is 30 amp 4wd shift on the fly. Have you checked this fuse yet?
http://www.fordservicecontent.com/Fo.../03f23og5e.pdf
http://www.fordservicecontent.com/Fo.../03f23og5e.pdf
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,106
Likes: 4,714
From: Henderson, NV
I'm using my phone so I can't see sigs. I'm assuming you have ESOF since you said "turn the switch". Can you hear the actuator motor on the transfer case moving when you turn the switch? Check the connector to the motor. Is it fully inserted? Any chafed wires? If the wiring is okay, try taking the motor off the transfer case so the motor is not loaded when turning. If the motor turns okay off the TF, try turning the shaft on the TF with channel locks. If it takes a lot of force, you have a jammed TF. When was the last time your 4x4 worked?
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,350
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From: Lake Hartwell, GA
Check the plug/connector on the transfer case to see if has come unplugged.
Check to listen for the motor on the transfer case to try and engage 4x4.
Turn the switch to 4x4 and roll the truck forward 10 feet or so slowly and see if it engages.
Do you have manual or automatic hubs?
Does your vacuum pump work and if so, does it shut off after a short amount of time and building vacuum?
Taken from page 128 of the manual.
To prevent damage, the
electronic shift 4WD system is
designed to engage 4x4 HIGH
(4WD high) when the vehicle
is moving. If the 4x4 indicator
light does not illuminate when
shifting a vehicle that is
stationary, start the vehicle
moving. Once the vehicle is moving, 4x4 HIGH (4WD high) will
engage and the 4x4 indicator will illuminate.
Do not shift into 4x4 HIGH with the rear wheels slipping.
Check to listen for the motor on the transfer case to try and engage 4x4.
Turn the switch to 4x4 and roll the truck forward 10 feet or so slowly and see if it engages.
Do you have manual or automatic hubs?
Does your vacuum pump work and if so, does it shut off after a short amount of time and building vacuum?
Taken from page 128 of the manual.
To prevent damage, the
electronic shift 4WD system is
designed to engage 4x4 HIGH
(4WD high) when the vehicle
is moving. If the 4x4 indicator
light does not illuminate when
shifting a vehicle that is
stationary, start the vehicle
moving. Once the vehicle is moving, 4x4 HIGH (4WD high) will
engage and the 4x4 indicator will illuminate.
Do not shift into 4x4 HIGH with the rear wheels slipping.
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Papa Smurf
Joined: Nov 2009
Posts: 1,080
Likes: 204
From: Woodstock, GA
Reminds me I need to check to see if mine is working before I go out in the snowy mountains. Wasn't there something about being in NEUTRAL when you turn switch..... or was that for low range 4x4?
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Thread Starter
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Laughing Gas
Joined: Aug 2017
Posts: 905
Likes: 37
I'm using my phone so I can't see sigs. I'm assuming you have ESOF since you said "turn the switch". Can you hear the actuator motor on the transfer case moving when you turn the switch? Check the connector to the motor. Is it fully inserted? Any chafed wires? If the wiring is okay, try taking the motor off the transfer case so the motor is not loaded when turning. If the motor turns okay off the TF, try turning the shaft on the TF with channel locks. If it takes a lot of force, you have a jammed TF. When was the last time your 4x4 worked?
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,106
Likes: 4,714
From: Henderson, NV
Originally Posted by MoBill122
Reminds me I need to check to see if mine is working before I go out in the snowy mountains. Wasn't there something about being in NEUTRAL when you turn switch..... or was that for low range 4x4?
Originally Posted by Lockholder
Yeah 2wd 4hi 4lo on a dial switch no noise or anything. i checked the switches and all connections before and no issues. i haven't taken the motor out or checked the TF before. 4x4 been out since i had the truck. manual hubs
You will notice the shift motor has slotted holes that the bolts holding it onto the TFC pass through. Those are so you can adjust the shift position. The shaft on the TF doesn't turn very much to shift into one of the three modes. Bear that in mind when you put the motor back on so you don't accidentally shift the TFC into a position the system is not expecting, TFC in 4-Hi with shift motor in 2-Hi for example.
I'll dig up the relevant picture from the shop manual when I am in front of the PC again.
Lead Driver
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
looking at the shaft, full clockwise is 2wd , rotating counterclockwise the first detent is 4hi and the next is 4lo, these detents are where the tcase needs to be in each gear, Even if you use a 15mm open end wrench to shift the tcase you have to align the gearmotor back with the slot, The range indicator will adjust with the motor, ford used no tamper torx bolts for a reason, the range indicator is calibrated using an ohm meter so unless you have a factory service manual I suggest not adjusting the black plastic range indicator that the wires plug into.
Once you have the shift motor off you can test it by supplying 12v + and - to each terminal,
you might want to use a sharpie to index the slot to the case so you can get it back into position. A 3/8 ratchet extension fits in the slot and you can align it back up.
There are several inputs that go to making the ESOF function and a scan tool to pull ford codes is useful, it could be anything from your ignition switch, MSS, ABS, VSS, TRS, Brake pedal switch or the GEM itself.
Honestly I think the ESOF has more Vodoo then an automatic transmission
Once you have the shift motor off you can test it by supplying 12v + and - to each terminal,
you might want to use a sharpie to index the slot to the case so you can get it back into position. A 3/8 ratchet extension fits in the slot and you can align it back up.
There are several inputs that go to making the ESOF function and a scan tool to pull ford codes is useful, it could be anything from your ignition switch, MSS, ABS, VSS, TRS, Brake pedal switch or the GEM itself.
Honestly I think the ESOF has more Vodoo then an automatic transmission
Lead Driver
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
he has manual hubs, no vacuum needed for the transfer case operation only the hubs and climate control panel.
The vacuum pump and PVH part of the system is a output from the GEM not an input so even if it were bad it wouldn’t stop the tcase from shifting.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Those instructions crack me up. If I could get the damn thing into 4X4 HIGH, I wouldn't be reading the manual on the transfer case motor in the first place. Do they specify how this is done manually? I ask, because mine failed - and I'm getting ready to replace it this week.