daily doggy will sort you out mate..:thumbsup..probly be along shortly:cool

 

firstly has it had any work done?like lambda sensors or cam sensors etc renewed at any point?

if the DSC is lighting up you sure your traction control isnt operating making it feel like surging?

 

No, no sensors changed recently. The cam position was done 3 yrs ago. The most recent work (before the ICV) has been to do with the radiator.

The DSC light only comes up when the EML light comes up (I.e. when the ICV fault occurs) and not when the surging happens (which is pretty much all the time under a constant light throttle).

 

the DSC bit is the worrying bit points towards ECU or electronics malfunction can you explain more whats happening with the DSC?

what wheels and tyres??

 

The wheels are 225/40/18 all round. I have tried driving with DSC off (using the button) and the same faults came up. The DSC logged error 'incorrect data from Dme' when I got an Indy garage to plug it in.

 

thats what i was worried about it sounds like an electronic or software corruption ECU/DME fault...

this is prolly gonna hurt wallet wise but it needs to be hooked up to a BMW specific diagnostics machine to see what the DME is doing i have read that a DME software upgrade sometimes is available...

when does the DSC light illuminate?

if ya lucky the DSC system or other sensors are sending duff data to the DME..

 

It is odd because (for me) it is difficult to relate a DSC type fault with an ICV fault. When the lights come up the car goes into limp mode - does this effect DSC operation ?
Are you thinking that the surging might be DSC instigated ? The light doesn't come up at that point though. I have managed three days of (slightly jerky) driving between clearing the codes and it (DSC & EML, ICV fault code) re-appearing.

 

an iffy DSC control unit can cause alsorts of issues it is a common failure on BMW's and very expensive..

it hard to diagnose on a forum but you need to approach it from the DSC fault forget the rest as the DSC is the main issue at the moment i think it may lead to or cause the rest of the problems..

is the DSC light appearing on the dash with no obvious actual physical traction problems?

 

and very expensive..
eek.

Aside from the already mentioned light throttle issue then there are no obvious traction issues. The DSC light has come up (& gone off) in correct/expected operation in the last few days on wet man-hole covers (don't you just love the british summer!). Otherwise, no the Dsc light does not come on until the fault condition occurs (typically on a small incline under light throttle).

 

i can only suggest a hookup to a proper BMW diags and live data machine with a geeser who knows what hes looking at and go thru the DSC and DME system..

you can buy DSC units also called abs units second hand or get them remanufactured for a fraction of the price worst case scenario..

engine surging can be caused by alsorts its just it should not intefere with the DSC in anyway in normal situation so it having problems DSC wise is a more serious issue to address first..
although its reporting incorrect data from the DME to the DSC which is strange and points back to the DME again..

chicken and the egg scenario..

 

Ok, sounds like I need to get it booked in at my local BMW dealership for some serious diagnostics.
:frown
In the meantime, is there any DSC related sensors or connections that I should look at/clean/try disconnecting ?
Cheers.

 

ICV=TPS=DSC=Wheel speed sensor

 

NealP - Can you elaborate a bit for me ? Ta.

 

one of your wheel speed sensors is giving duff readings...especially in the wet.
the throttle position sensor is linked in with the DSC and could give the icv code.
try getting a bmw specific scanner on your car to narrow down which wheel sensor is at fault.
in the meantime you could remove and clean each sensor and inspect the related ring gear on each wheel...use a little silicon grease on refitting to keep water ingress to a minimum.

 

Thanks for that info.
I did change the front discs last winter and I think I read that this can have an effect on the wheel sensors. Any thoughts ?

 

No, shouldn't make any difference at all unless the wheel speed sensor cable gets damaged in the process.

 

I had a similar problem with my E46, but only once... The fault code only came up with a decent scanner (I got someone to plug a BOSCH one in - costs about £20k or something stupid)

When it was plugged in, it cam up with a steering angle position sensor. When it was reset and recalibrated it never cam back:thumbsup

 

I'll have a good look at them then, cheers guys. I suppose an easy test will be to disconnect them (one at a time perhaps) and go for a short test run and see if the faults re-occur. Hope they come out easy !

Actually, thinking about it, the front wishbones were replaced by a garage in May and the fault showed up not long after. Wonder if something took a knock ?

 

when i asked you if you had any work done you said no...:shifty::sarcastic

 

I did, sorry :embarrassed
At the time I was thinking icv/engine/dsc etc not wishbones/bushes.

 

a lot of faults appear soon after work of some kind it may or may not be connected just gives a better picture for potential areas to go for and check first..

 

That makes sense. I'll look at the ABS sensors as soon as I can. Cheers.

 

Sorry to revive such an old thread

I'm new to bmw after a long line of jap cars I've taken the plunge and bought a 330ci,

On the drive home from collecting it the engine emission light came on and it developed a misfire

I have since changed all six coilpacks and it now runs sweet as a nut!

Nowwwwww it's doing the same as the topic starters I've removed the icv cleaned and replaced it, cleaned the maf but alas it's still the same.

The code it's showing is for idc and help would be great

 

Icv fault coming up on my 330ci after supercharging it

Hi all i have 330ci i fitted a supercharger to it and now i keep geting the the fault ( idle control valve mechanics ) im a b little confused now eml , dsc lights all come on

 

I have same problem fault with AC Schnitzer Supercharged did anyone get there's sorted?

 

hey im having a similar problem with my icv , changed it and im still gettin the code reading that it is mechanically stuck
really annoyed at this , only other fault codes im gettin are my upstream 02 sensors which triggers my CEL light