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4-wheel drive electronics are not working HELP

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Start with fuses and relays, and move on to wiring harnesses and plugs. Check in the power distribution box, under the hood, around the tranny and especially around the transfer case. Look for broken wires and corroded plugs. If the problem persists, your better off w/ dealer diagnostic versus your buddies screwing around doing more damage.

Posted on Aug 05, 2008

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2005 4.6 f150 4WD drive is not engaging.the front pass.wheel makes a grinding noise while in 2WD.when i shift to 4WD the noise goes away but 4WD does not engage. solenoid? actuator? or something more?


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1 Answer

How do I repair all wheel drive in 2004 chevrolet astro van. hit a big bump and lost all power. later retrieved power, but lost all wheel drive. thanks for any help.


its electronic solenoid inside the transmission you have to pull the transmission apart to get to it. starting with the transmission pan.you might want to use a transmission shop for this one.

Oct 14, 2014 | 2004 Chevrolet Astro

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

3 Answers

Rear cluch not working


Depends on what model and components you have:

{ ...
ENGINE TORQUE DISTRIBUTION – DIRECTING THE FLOW OF POWER
In an all-wheel-drive vehicle, engine power can be directed to all four wheels. Subaru Symmetrical AWD differs slightly from model to model in how it directs power to the wheels, depending on its transmission.

MODELS WITH FIVE-SPEED MANUAL TRANSMISSION – CONTINUOUS ALL-WHEEL DRIVE: A viscous-type locking center differential and limited-slip rear differential help distribute torque – normally configured at a 50/50 split front to rear. If wheel speed differs between front and rear axles, the center and/or rear differentials lock up to help distribute power to the wheels with the most traction.

MODELS WITH FOUR-SPEED AUTOMATIC TRANSMISSIONS – ACTIVE ALL-WHEEL DRIVE: An electronically controlled variable transfer clutch and limited-slip rear differential distribute power to where traction is needed. Sensors monitor parameters such as wheel slippage, throttle position, and braking to help determine torque distribution and direct it to the wheels with optimum traction.

MODELS WITH FIVE-SPEED AUTOMATIC TRANSMISSION – VARIABLE TORQUE DISTRIBUTION ALL-WHEEL DRIVE: As with Active All-Wheel Drive, an electronically controlled variable transfer clutch distributes power, but through a planetary-type center differential and a viscous-type limited-slip rear differential. Torque distribution is normally configured at a performance-oriented rear-wheel-biased 45/55 split front to rear. Sensors monitor the same parameters as for Active All-Wheel Drive.

WRX STI, WITH SIX-SPEED MANUAL TRANSMISSION – DRIVER CONTROLLED CENTER DIFFERENTIAL (DCCD) ALL-WHEEL DRIVE: The STI uses an electronically managed multi-plate transfer clutch and a mechanical limited-slip differential in conjunction with a planetary-gear-type center differential to control power distribution between the front and rear wheels. Featuring manual and three automatic modes, DCCD is normally configured at a 41/59 split front to rear. Sensors monitor parameters such as wheel slippage, steering angle, throttle position, and braking to help determine torque distribution and direct it to the wheels with optimum traction. DCCD also features a limited-slip helical front and Torsen® rear differential. ... }

And what are the symptoms? How do you know the coupling to the rear is not working?

Jun 05, 2010 | 1995 Subaru Legacy

1 Answer

Won't shift out of 4 wheel drive low


modulator stuck or damaged located at transfer case take a rubber mallet and hit around where modulator and case connect than try to shift again if nothing than un bolt and lube and move actuator rod, with out try to move electronically w/switch back to 2 wheel drive -if moves should work can replace but look for replacement as back up if happens again just change over

Oct 05, 2009 | 2001 GMC Yukon XL

2 Answers

I have GMC yukon xl 2005 and I got problem on 4 wheel drive.


if i am not mistaking these have the vacuum module on the front differential check it it is probably bad common problem on these trucks from 96 and up if it is the electronic type it could be one of three things the switch on the dash, motor on transfer case, or the electronic module for the 4 wheel drive.

Aug 25, 2009 | 2005 GMC Yukon Xl Denali

1 Answer

I have a 1996 Z71 Floor shift n four wheel drive but now it won't kick n four wheel drive can anyone help


check to see if the front drive shaft is turning if it is there is a electronic solenoid that engages the front diff its located in center of the diff make sure its pluged in

Jul 12, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

1993 Jeep Grand Cherokee Laredo wont drive when put into gear


No, not with out a lot of work. Electronics are most likely different on the 2 also.

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1 Answer

1999 Chevy Suburban wont kick into four wheel drive


if it is electronic there is probably something wrong with the wiring..

but if it is manual...it might be the actuator........



Feb 11, 2009 | Chevrolet Suburban 1500 Cars & Trucks

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