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Differential problem cardan rotating but no traction

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2 Answers

What does trac light mean?


destroying the transmission.possibly

Aug 09, 2015 | 2004 Buick Century

1 Answer

Why does my 4 wheel drive not work all the time?


Elaine,

not work, do tell what makes you think it dont work (a lamp) or tires slipping or dead tires. (by tires mean that and traction)??????????

what mode fails, of the many, and where.???????



first off, we dont know what your tires are touching.

on road, or off road. pavement or ICE or snow.

that matters big time . (you read manual and match MODE to Road)

your lost operators guide explains all that, right?

eg: how and when to use, 4wd, its all there. I promise.

ControlTrac 4-wheel-drive system



here are the mode. which one , gives you problems.



quote ford with comments.



What are the modes, and how do they differ?

(note this is the operational behavior of a 2008 Ford Expedition. Newer and older Expeditions will vary only slightly)



2H 2-wheel-drive with high range gearing (1.00:1) Rear-wheel-drive capability,

2-wheel electronic traction control system is enabled



4A 4-wheel-drive Auto with high range gearing (1.00:1) Full-time all-wheel-drive capability, ((best on pavement or any time)

Electronically adjusted torque split to front & rear wheels, Electronically variable center differential,

Front driveshaft & rear primary driveshaft allowed rotational speed difference,

4-wheel electronic traction control system is enabled



4H 4-wheel-drive with high range gearing (1.00:1) Part-time 4-wheel-drive capability, (not for dry pavement EVER)

Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,

Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,

4-wheel electronic traction control system is enabled



4L 4-wheel-drive with low range gearing (2.64:1) Part-time 4-wheel-drive capability, (off road usage, mostly)

Continuous 50/50 torque split to front & rear wheels, Electronically locked center differential,

Front driveshaft & rear primary driveshaft mechanically locked with no rotational speed difference,

4-wheel electronic traction control system is enabled, ESC and RSC are disabled



In 4A mode the center differential is electronically-controlled and rear drive wheel bias. The on-board computer monitors for any sign of rear drive wheel slip (loss of traction)

If loss of traction is detected, the center differential is told to send a share of the engine\'s torque to the front drive wheels. It will not let the front driveshaft turn at the same speed as the rear driveshaft.



What about traction management?

1997-2002 model Ford Expeditions offered an optional limited-slip rear differential (LSD). A conventional open rear differential was standard along with the conventional open front differential and the electronic locking center differential.

comment with out LSD, one tire can spin, on say ice.

but the other 3 tires dont, in full time.

Jul 04, 2014 | 2003 Ford Expedition

1 Answer

Traction control light is on d car is making loud noice wont move


The traction control will signal when there is a difference in speed of wheel rotation from one side to the other. Sometimes an Emergency brake can come apart inside the drum and jam a wheel.

A worse case condition would be a stripped differential gear on the axle shaft. The wheel sensors may pick up the difference in rotation of the remaining shattered parts.

Only a few things to do to see how bad stuff is. Elevate both rear wheels, put transmission in neutral and try to move rear wheels. If 1 does not move, it is either jammed inside the differential or jammed
out in the brake drum.

Try getting jammed side brake drum off. If still jammed, the differential cover needs to come off.

Feb 17, 2014 | 2008 Mercury Mountaineer

1 Answer

Ford 2005 freestyle traction control light on, no issue with exhilaration code on diagnostic was p1889. car is operating in 2wd not AWD. was told code is for oil pressure sensor but traction control is not...


  • This code is for tractiion control. Possible causes include:
  • (could be other actuator, sensors,ect.in traction control)
  • Failed Active On-Demand Coupling Oil Pump
  • Failed Differential Electronic Module (DEM)
  • Low Differential Fluid
  • Oct 29, 2013 | 2003 Ford Focus

    1 Answer

    The all wheel drive doesnt work only the front tires spin in the snow


    The 08 Vues AWD system is very different than from previous models. The new Vues system is more like the technology on the Outlook. I' don't know detail on the hardware, but from a function standpoint there are two big differences:

    1)The system is PREDICTIVE, not reactive. It does not wait for wheel-slip to make it engage. The system monitors throttle position, steering angle ect. and re-directs torque before wheel spin occurs.

    2) The old system sent extra torque to the wheels that were slipping to boost traction. The new system sends power to the wheels that are gripping.

    The result is a better, smoother system that will do a better job of keeping the Vue from getting stuck.

    The old system was a single gerotor type AWD system. Essentially, a gerotor AWD system uses differences in rotating speed to spin a pump and apply pressure to clutchs. The single gerotor system used in the Vue essentially engaged and disengaged the rear axle when a differences in rotating speed occurred between the drive shaft and rear differential (indicating the front wheels were spinning faster the rears). From here on out, power goes into an open differential and was distributed accordingly (i.e. not very well).

    GM also uses a twin gerotor system in the form of Versatrak. This operation in much the same manner, using a difference in rotating speed to spin up a pump and apply pressure to clutches, except the Versatrak system has a pump for each output axle. This allows the rear differential to act of each rear axle much in the way a limited slip differential does, better managing torque distribution.

    The new system used in the Vue (as well as the Outlook, Acadia, and Enclave) is controlled by a microprocessor and operates by means of an electromagnetic clutch. It is very similar to the Haldex system marketed by Haldex Traction AB. The main difference being that Haldex still uses hydraulic pressure to apply the clutches, while the electromagnetic system used by GM (which I believe is developed by Borg Warner) uses electromagnetic force to apply the clutches. The operating principles are the same though. The new GM system is well integrated with stability control, traction control, and ABS. The system actively monitors vehicle dynamics and driver input to determine when to being engaging AWD before it is actually needed. With the ability to manipulate power delivery using AWD and stability control (by selectively applying brakes at each individual corner), the new Vue is very robust in terms of torque management. For all you folks in the snow belt, it should be dynamite in slippery conditions!

    Hope this helps answer your question. Good luck and be safe on the snow.

    Dec 12, 2009 | 2003 Saturn VUE

    1 Answer

    What fluid do I put in the rear differential for my 01 Ford Explorer Sport?


    If you can read the tag on your rear differential cover it will tell you there.
    But just in case it's rusted beyond visibility here is what you need.
    A traction lock (limited slip) differential takes the synthetic 75w140. You may need some of Fords limited slip additive to prevent the clutch plates from grabbing as well.
    Conventional differential takes 80w90 no additive required.
    If you are not sure what yours is jack up the rear end, support it properly and block the wheels to keep it from rolling..
    If yours is 4 wheel drive make sure it is disengaged and put it in neutral.
    Do not start engine. Grab one rear wheel and rotate it. If the wheel on the opposite side rotates the same direction it is traction lock

    Nov 02, 2009 | 2003 Ford Explorer

    1 Answer

    My traction control on my 99 Merc Grand Marquis intermittently activates, typically on right hand curves, even though I am easy on the gas and it is dry. This means the car will not speed up and will only...


    Some differentials have a speed sensor in the Differential casing. You may want to go to Autozone for exact info.

    Most likely it is debris from the Emergency brake pads on the rear drums. The back rotors have a drum built into the reverse side.

    The traction control sensors work with the ABS and when the rotation of the wheel is different from side to side, the system activates the Traction control. This applies the rear brake to a single wheel and can wear out the disc pad. The Trac control also can throttle down the engine by choking off the air intake.

    Most likely all the debris is spinning at different RPMs and is simulating wheelspin. The sensors can be manually cleaned as well as the large hub "star" which the sensors get their reading from. You will see when you get it apart.

    Oct 09, 2009 | 1999 Mercury Grand Marquis

    1 Answer

    What is lockup


    Most vehicles are two wheel drive (2WD) and some are four wheel drive (4WD). All have differential gearing this means that each wheel can turn at it's own speed and this is essential when cornering as the inner wheels traverse a shorter path than the outer wheels. Without it the outside tyres would all tend to skid to some extent as they try to rotate on a surface which is moving faster or slower than the tyre's rotation speed. This is known as lock up and it causes excessive tyre wear, fuel consumption, steerring and suspension component wear and an unpleasant snatchy ride.

    On off-road surfaces, lock up (differential lock) is a good thing as any tyre which loses traction does not cause the others to do so. As the surface is slippery or unstable the other tyres can easily skid against the surface without excessive wear whilst cornering.

    Jul 09, 2009 | 1995 Toyota 4Runner

    2 Answers

    Part names


    cardan centering bearing
    point bolts needed to be removed that connects D.S.to transfercase

    May 22, 2009 | 2001 Ford Excursion

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