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What do they mean of 4 wheel drive-rear? - 1999 Nissan Pathfinder

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Rear wheels not engaging what can I do to troubleshoot the awd?


awd drive cars have a differential action between front and rear wheels and there should be a switch that allows you to lock up that action for adverse conditions
if the rear wheels are not working , it is because there is no drive action to the front wheels ( front wheels spinning or broken drive shaft to the front)
all wheel drive means that in normal driving when there is traction on all 4 wheels that the power is transmitted evenly to all 4 wheels
It is not 4 wheel drive where power is applied to both axles or in the event of one axle loosing traction the other axle still drives

Dec 15, 2015 | 2007 Lincoln MKZ AWD

1 Answer

If 4 wheel drive won't kick in do that mean awd won't work ?


AWD is 4 wheel drive with a diff in the transfer case to allow for uneven running between front and rear axles
If you have a 4wd drive button then that simply locks the centre diff so that there is no equalization of differences in the front and rear axles

Mar 05, 2015 | Cars & Trucks

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

Ok so my 2009 Toyota rav 4 is always in 4 wheel drive so to speak so then what is the 4 wheel lock button on the dash for?


Rav 4 is an all wheel drive vehicle not a 4 wheel drive as in jeep or Landrover. When you press the 4 wheel lock it activates a lock dog in the transfer case that means both front and back axles now drive as long as you have traction on at least 1 axle set. There is no means of allowing the front axle to speed up and slow down in relation to the rear axle ( as in going over a speed bump) and you get axle wind up which puts a load on all the drive train . The faster you go the bigger the load and so it kicks out over 25mph as obviously there is no need to have both front and back locked together at speed . It also makes steering harder to turn

Dec 07, 2013 | 2009 Toyota RAV4

1 Answer

2002 Chevy 4wd


maby im wrong but if you rev up and only rear wheels spin that means that it might be 4 wheel drive but not constant 4 wheel drive or diff lock system ,,,, ,, in 4 wheel drive all wheells will turn together but if pressure of slip is bad enough or torque high enough only 2 wheels will drive ,,, thats why diff lock locks wheels together in each axle to over come this ,,, all wheel drive like in landrover locks all 4 wheels together to ensure all wheels rotate to give best grip

Feb 13, 2012 | 2002 Chevrolet Suburban

1 Answer

I have 2001 Merc 430ML what is the Low Range botton mean?


low range means you are in 'low range 4 wheel drive' push the button while the engines running and the gear shift levers in neutral to switch to high range [or 2x4] low range,cannot drive over 15 miles per hour,high range can drive up to 65 miles per hour. see the difference? you need to shift the transmission to neutral,while the engines running,and your foot on the brake pedal, push the button on the 4x4 to light up to the two wheel or rear wheel diagram. then when it lights up the 2 rear wheels, it's in rear wheel drive. if this does'nt describe your problem! please do not attempt anything and call toll free# for mercedes roadside assistance for free at 1-877-815-9962 these people have been a great asset to my buisness. thank you for choosing fixya.com

Mar 08, 2011 | 2006 Mercedes-Benz ML-Class

1 Answer

1987 dokota appears to go in four wheel drive but all wheels do not pull or move when stuck in snow or mud.


Technically you do not have 4 wheel drive, you have two wheel drive (possibly three-wheel drive). When you engage 4WD you direct power to the front and rear differentials. The front differential is an open style which means that only one wheel will drive, and the rear differential is likely the same type which means that you will only have two wheels driving the vehicle (one front, one rear). If the rear differential is a "posi-trac" or "limited-slip", then both axles should lock and drive the vehicle (hence, three-wheel drive), but this style differential is not as common as it once was.

Feb 07, 2011 | 1987 Dodge Dakota

1 Answer

EXPLAIN THE DIFERENCE BETWEEN THE FRONT WHEEL DRIVE AND THE REAR WHEEL DRIVE


FRONT WHEEL DRIVE IS THAT THE FRONT WHEELS ARE WHAT DRIVES THE CAR AND THE TRANSMISSION IS IN THE FRONT REAR WHEEL DRIVE MEANS THAT THE REAR WHEEL DRIVE THE CAR ALLWHEEL MEANS THE THE FRONT AND REAR WHEELS DRIVES THE CAR FOUR WHEEL DRIVE MEANS THAT YOU CAN HAVE ONLY TWO WHEELS DRIVE THE CAR OR AL FOUR WHATEVER YOU PUT IT IN

Oct 19, 2010 | 2002 Toyota Celica

4 Answers

What is auto 4 wheel drive?


Auto 4 wd is when the Silverado's PCM takes readings from the front and rear driver shaft and when there is any detection that the speeds are different. The Auto 4WD will activate the transfer case to lock it self to 4wd until the front and rear drive shaft are running at the same given speed of rotation.

Thank you for using fixya

Aug 24, 2010 | 2000 Chevrolet Silverado

2 Answers

I have a partime light on, I dont have the owner manual, can you please tell me what does it mean


Part time is for rear wheel drive is engaged only. When it is off you are in 4 wheel drive

Apr 18, 2010 | 2007 Jeep Liberty Sport

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