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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > can you pull a fuse to disable DTC? my xi is suddenly useless in the snow



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      12-16-2010, 07:41 PM   #1
blacksail337
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can you pull a fuse to disable DTC? my xi is suddenly useless in the snow

so i've got some stability control and transfer case codes being thrown right now that i havn't been able to figure out and while they're active i can't disable stability control with the button on the dash

so i can't even make it up my BARELY steep driveway in todays 2 inches of snow, because every time i start to make some progress the moronic traction control cuts my throttle basically to idle

anyone know if there's a DTC fuse i can yank or other way around this in the meantime?
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      12-16-2010, 08:36 PM   #2
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try disconnecting the battery for five minutes then reconnecting it. It may reset the DTC
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      12-16-2010, 09:05 PM   #3
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no it's nothing that simple, i have a bt tool, the codes won't clear

i've eitehr gotta bad transfer case servo motor or some stability control module thats fried

most likely whichever is the most expensive with the way my lucks been with this car
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      12-16-2010, 10:14 PM   #4
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Quote:
Originally Posted by blacksail337 View Post
no it's nothing that simple, i have a bt tool, the codes won't clear

i've eitehr gotta bad transfer case servo motor or some stability control module thats fried

most likely whichever is the most expensive with the way my lucks been with this car
What kind of wheel/tire setup are you running?
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      12-16-2010, 10:26 PM   #5
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You can pull fuse #26 to disable the whole AWD system. However it also disables your speedo, ABS, EBD, wheel angle sensor, DTC, DSC, and few other systems.

Your turn signals don't automatically turn off when coming out of a turn. Also the wipers don't stop moving. And your instrumnet cluter will act weird....gas gauge will fluctuate, and tons of lights will come up.

Also tons of hidden faults are stored but you have a BT tool so no worries there.

Basically you have a 2wd car that, when driving in a straight line, you can burn both wheels. Our open diff will act like a LSD but when turning, the wheels will turn at a different speed.

EDIT: If you don't have snows mounted, I don't think this will help either. My wheels break traction on dry pavement super easy. I would imagine with a 335, it would be even easier. On snow.....
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      12-17-2010, 06:46 AM   #6
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haha yea doesn't sound like that will do me much good, i was hoping there was one that would just cut DTC/DSC off since it insists on being on right now. . . i hate this car

and hajduk i'm running 18" wheels, 8.5 fronts 9.5 rears with 235/40 fronts and 255/40 rears
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      12-17-2010, 08:44 AM   #7
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Quote:
Originally Posted by blacksail337 View Post
haha yea doesn't sound like that will do me much good, i was hoping there was one that would just cut DTC/DSC off since it insists on being on right now. . . i hate this car

and hajduk i'm running 18" wheels, 8.5 fronts 9.5 rears with 235/40 fronts and 255/40 rears
He meant . summer, 4 seasons or winters
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      12-17-2010, 08:48 AM   #8
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ahh sorry i'm running nitto 555's up front and fuzion 512's out back, both just general all season performance radials

same tires i had last year in the worst snow we've had in like 15 years, and when all these stupid codes weren't on i could just turn DTC and DSC off and had zero problems
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      12-17-2010, 10:02 AM   #9
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If you push the button, it will disable DTC, but because of your fault code, it wont engage. But did you try holding the button for 4 seconds to totally disable DTC / DSC?
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      12-17-2010, 10:04 AM   #10
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yea i've tried holding it, the button does nothing while the codes are up
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      12-17-2010, 10:04 AM   #11
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Well those tires are not made for snow bro. I know they can stand the snow while being new, but as they worn off; I'm pretty sure thats a big part of the problem.
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      12-17-2010, 10:06 AM   #12
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the tires are fine, they are new and the car was unstoppable with the same setup last year in really really bad snow and ice

my cars just screwed up
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      12-17-2010, 01:35 PM   #13
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What code are you getting on the BT? I've got the same issue (DSC, 4x4, ABS, etc. errors). I can't recall the code I got off my BT, but my local shops (not BMW, I don't have a dealer near me) have no clue what it is. Error is something like "Transfer case, clutch position unknown" or something like that. I suspect the motor in the transfer case, as I put a multimeter on my wheel spped sensors and all were good. Your issue could be wheel speed sensors, if one is bad, it will throw the whole 4x4, DSC, ABS off.

Also, the DSC comuter is the same computer/controller that controls the ABS (or so I've ben told). It is located under the hood, on the driver's side, under the cover near the windshield (not the cabin filter cover, it's the small cover near the fender). If you take that cover off, you will see a "thing" that has all the brake lines going in it. There is also an electrical connector that attaches to a black part. The part that the electrical connector attaches to is the ABS computer/controller (not the silver part that the brake lines attach to). IIRC, it's made out of black plastic. You can remove the electrical connector (it's kind of odd, but there is this piece you pull up on the connector and then the connector will slide out toward the passenger side, I think). However, on my car (2007 328xi), it's almost impossible to remove the ABS controller without removing the brake lines as there isn't enough room to get a wrench/socket/etc. in there to remove the bottom 2 screws that hold the ABS controller onto the silver part that the brake lines go into.

If you are so inclined, you can remove the ABS controller and send it in to a place to get it checked out/repaired. There is a place in Idaho called module masters who will rebuild the unit for $300. They also check the units before repair and don't charge you, except shipping, if the unit tests good. I have done this on my A4 before with great results. I had mine in my A4 repaired about 3 years ago for $150 and it still works perfect.

However, in my case, with that BT error saying transfer case clutch position unknown, I'm not sure repairing the ABS controller will fix my problem. It's too cold out right now for me to try to remove the ABS controller, so I may wait until spring to check it out.
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      12-17-2010, 01:44 PM   #14
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i forget the exact codes, but it's something like you said, transfer case internal malfunction or something

i took it to an indy shop and they told me the trasfer case seems fine and it was most likely just a software issue and wanted me to do a $450 update. that seemed odd so i didn't do it.

one other guy here on the boards had that transfer case servo motor fail, but his car was actually rear wheel drive, and made a loud grinding noise on startup. he was still under warranty so wasn't an issue, but that little motor is $600 so i'm hesistant to start there as far as trouble shooting goes.

my car actually did exactly what his was for about a week, and also had the abs and other lights on as well, but then they went off, awd was restored and the grinding noise went away, it's really wierd

thanks for the all the detailed info about the wheel speed sensors and abs controller unit, i had no idea about all that. the indy shop told me they figured it was a problem with whatever unit controlled stability control that was just causing the transfer case code. cause it should be pretty obvious if somethings wrong with a transfer case, there'd be obvious driveability problems, grinding or whining noises ect.

how exactly do you test your wheel speed sesnors?

i'll hook my BT tool up again this weekend and pull the exact codes i'm getting

thanks for all the input!
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      12-18-2010, 10:38 AM   #15
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your tire sizes are definitely of concern at 235/40 and 255/40...mathematically their diameters are off by about 2.5%....previous posts with mismatched diameter wheels have pointed to issues with the transfer case. The rumor is to stick with diameters (probably more importantly revs per mile) that are within 1%. get matching tires immediately!
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      12-18-2010, 11:58 AM   #16
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i dunno i'm not convinced it has anything to do with the tires, i had this setup on the car as soon as i bought it and these codes came up about a year later.

plus i've put my stock 17's back on several times with 235's all around and the codes stayed on

AND as i've said me and a very well reputed independent shop owner agree that my transfer case isn't damaged or having any problems at all. it's code is just a result of the stability controls code being thrown

my car had 18" staggered wheels as a factory option that according to tirerack.com would have had 225's up front and 255's in the back
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      12-18-2010, 03:16 PM   #17
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the stock staggered setup is within 1%, i use that setup for winter and i use 225/35 and 255/30 on the performance 19" wheels for the summer, even that is within the 1%. i don't have any experience on what is going on with your car now, but i'd suspect damage has been done because of your tires.

http://www.e90post.com/forums/showthread.php?t=186089

this guy was running the exact same tires as you...
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      12-18-2010, 03:20 PM   #18
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sorry for the confusion, my rears are 35 series profile, not 40

and that guy was only getting the standard blinking of DTc doing it's job under acceleration

i have a 4x4! and DTC light on at all times
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      12-18-2010, 03:30 PM   #19
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what are your exact tire sizes...because even that still makes the difference 1.5%

i'd take it to the dealership and just have them fix it. if it costs 1000 bucks its still less than the extended warranty, and then you'll have your car back to being unstoppable in the snow.
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      12-18-2010, 04:09 PM   #20
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I pasted a link below to give you all the information you will almost ever need to check wheel speed sensors. The link has an amazing amount of info on diagnosing ABS errors. It's geared more for older cars, but there is some info on e90's (I posed some info under "orangedawg"). I also post below the pinouts for the e90's at the abs connector (located under the hood as I noted in my above post). Put a multimeter with really thin wire to the pins on the connector to test the sensors. You want to use the diode setting on your multimeter. Again, the below link has tons of diagnsotic stuff, way more than most people will ever do. The basic advice on that forum is after checking wheel speed sensors, if they test good, is to send unit to get it repaired. The only place I found that will do our model (e90 with xi) is module masters for $300.

BTW, that forum is very long, over 13 pages of long posts. Super informative, though. I think I started posting my info on page 9, I think.

Pin out:
I've got an 07 e90 328xi and was trying this out. From what I found in Bentley's, it looks like these are the pin outs for my car:

RF 6 and 18
LF 21 and 22
RR 19 and 31
LR 20 and 33

Link to ABS/DSC error forum:
http://www.bimmerfest.com/forums/sho...d.php?t=356272
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      01-01-2011, 09:27 PM   #21
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Have the same kind of problems with fuel cut off. Very disappointed. I don't like the programming of these cars. My Audi is a much better performer in the snow.
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      01-01-2011, 09:32 PM   #22
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Quote:
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Have the same kind of problems with fuel cut off. Very disappointed. I don't like the programming of these cars. My Audi is a much better performer in the snow.
Do you have the transfer case issue? You can allow some wheel spin by pressing the DTC button. Holding it will completely disable DTC and DSC for unlimited wheel spin.
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