Question about 2003 Ford F250 Super Duty Crew Cab

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03 f250 w/6.0 4x4

It has manual and locking hubs with electronic 4x4 selector switch on dash, when I select 4x4 and have my air cond. on, my air starts blowing from the defrost vents and the 4x4 doesn't enguage(that was at first) now the other day when backing my trailer up hill something made a loud poping noise(from underneath,like something metal broke) no 4x4 motion, then I manually locked the hubs, switched into 4x4 and it worked fine but was hard to get it to disenguage, I kept switching 4x4 selector on and off but stayed stuck in 4x4 low, after backing up and going foward several times it finally unlocked.??any clues??

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The 4x4 low will not disengage without placing transmission into neutral and stepping on brakes hard. Not sure about the rest of the issues

Posted on Sep 27, 2014

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Sounds like a problem with the elctronics to me?

Posted on Oct 03, 2008

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2003 ford f250 superduty 4x4 don't work no indicator light on dash changed4x4 switch module what next?


Check for codes. Usually part stores do it for free. here is how it works.
Principles of Operation

Electronic Shift on the Fly (ESOF) System

The electronic shift on the fly (ESOF) system is an electronic shift system that allows the operator to choose between 2 different 4x4 modes as well as 2-wheel drive. The operator can switch between 2H and 4H mode at speeds up to 88 km/h (55 mph). To engage or disengage 4L, the 4x4 generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal depressed and the transmission in NEUTRAL (or clutch pedal applied on manual transmission vehicles). This system contains pulse vacuum hublocks (PVH). The selector on the hublock, when turned fully counterclockwise to the AUTO position, engages/disengages the hub depending on the driver-selected 4x4 mode of operation. The hublocks also contain a manual override. When the selector is rotated fully clockwise to the LOCK position, the 4x4 vacuum and electronic system used for coupling the front axle to the wheel is bypassed.

The transfer case is equipped with a dual-cone synchronous clutch. This clutch is used to synchronize the front driveline to the rear. All other internals operate in the same manner as the manual shift system. When the mode select switch (MSS) on the instrument panel is turned, the 4x4 module powers the transfer case motor, which activates a shift fork and engages the clutch. When the shift motor reaches the desired position, as determined by the encoder position inputs to the 4x4 module, power to the shift motor is removed. When the transfer case front and rear output shafts are synchronized, the lockup collar mechanically engages the mainshaft hub to the drive sprocket. At this point, the front axle PVHs are engaged. Instrument cluster "4x4" and "Low Range" indicator operation is controlled via hardwired outputs from the 4x4 module.

Electronic Shift Transfer Case

The New Venture Gear NV 273 electronic shift transfer case is a 3-piece aluminium design. The unit transfers engine power from the transmission to the front and rear axles. Under normal driving conditions the unit is in 2-wheel drive high (2H), but when desired, the operator may shift into 4-wheel drive high (4H) or 4-wheel drive low (4L). The transfer case is shifted electronically. The unit is lubricated by a positive displacement fluid pump that channels fluid flow through holes in the mainshaft.

The encoder assembly used for mode indication is of a Hall-Effect type. The system uses a total of 4 independent transistors for mode recognition. Each transistor is associated with a specific range of motor movement. When the circuit to each transistor is closed, a ground path to any of the A, B, C or D encoder pins is accomplished. When the circuit to each transistor is open, the connection to any of the A, B, C, or D encoder pins is pulled to voltage. Mode indication is "decoded" by the 4x4 module based on the varying combinations of signals coming from the transistors.

Hublock Operation

With the hublocks in the Auto position, the 4x4 ESOP system uses timed vacuum sequences to lock and unlock the wheel ends when switching the instrument panel MSS between 2WD and 4x4 modes. A high vacuum level (222 mm or 8.75 in. Hg and greater) is applied to the hublocks to lock the internal spring mechanism that engages (locks) the hublocks for 4x4 mode, and a lower vacuum level (114 to 184 mm or 5.9 to 7.1 in. Hg) is applied to unlock the spring mechanism that disengages (unlocks) the hublocks for 2WD mode. The vacuum signals are supplied to the hublocks by system components, including the 4WD control module or GEM, wiring harness, solenoid, vacuum harness and vacuum seals. As a first step in service, eliminate obvious items such as loose wiring connections, loose vacuum connections or damaged vacuum lines.

Dec 12, 2014 | 2003 Ford F250

1 Answer

What to do when air conditioning vents on 2005 chevrolet silverado1500/v6 ?


It is all electronic these days an electric motor is controled by the selector on the dash. Remove the dash surround: gear selector in 1st engine off, tile steering wheel down, push down FIRMLY on the top of surround and pull towards you and off it comes. Remove the two screws that hold the heater/air cond. control in, there are 4 plastic clips as backup release them and gently remove the control, inspect for loose connectors (there are 2) it helps to run the blower to see if you have found the problem- I did.

Jul 27, 2012 | 2005 Chevrolet Silverado

2 Answers

Last season my 4x4 was working now this year I went to put it in 4x4 and it did not light up or engage. What should i do first? 96 z71


does this trk have the push type or dial selector switch, or is it a manual floor shift like my 90 gmc? If its elec i would look for a fuse source first then i would go down below and check for power on the selector selonoid actuator then i would check for power at switch selectors, maybe they are just sticky or stuck from not being used. the light works off the lower switch sensors not the dash switches so untill it engages the ligh will not light. get them to engage first the worry about light if needed. And ALWAYS put trk 4x4 on through out the summer season on a dirt road or a grassy field just so they keep working. I even run my air cond once a month in winter so it keeps fresh and working, and knock on wood i never have had problems

Jan 10, 2011 | 1996 Chevrolet K1500

1 Answer

03 fx4 supercab transfer case engages, but no front wheel pull


Sounds like the front wheel hubs are not locking in.

Sep 11, 2009 | 1999 Ford Ranger SuperCab

1 Answer

Air cond dash light works, compressor doesn't go on.


AC's have a low freon switch that shuts off the system to protect the compressor in the advent that you have a freon leak have the system checked for a leak

May 28, 2009 | 1996 Toyota Camry

1 Answer

My 4 wheel drive will not disengage


You might want to check the gear selector switch that is located on the driver side of the tranny, if the 4x4 is electric and not manual for engagement, selector must read neutral to disengage 4 wheel drive. by experience if you drove it through deep water gear selector switch can get damaged.
Your hubs may be locked as well. Try reversing for 30 or more feet to try manually unlocking your hubs. Make sure 4WD is turned off when trying.

May 25, 2009 | 2003 Chevrolet Suburban 1500

3 Answers

Ford f250 four wheel drive electric selector problem. Will not shift out of four wheel low.


i have 2006 f250 4x4 will not engage unless i lock in hubs. once hubs locked in i can engage 4x4 by using electronic selector. why will it not engage when hubs are in auto and electronic selector is on 4high

Dec 21, 2008 | 2006 Ford F-250 Super Duty

2 Answers

Warn manual hub install 2000 f-250


THE KNOB ON THE DASH ENGAGES THE TRANSFER CASE, WHICH TURN THE AXLES. THE MANUAL HUBS LOCK THE WHEELS TO THE AXLES.


DCL

Nov 29, 2008 | 1995 Ford F250

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