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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 02-21-2015, 12:05 PM
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bmdubya1198 bmdubya1198 is online now
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ASC not disengaging, Where's the cable?

After looking at cn90's DIY for replacing the throttle/cruise control/ASC cables, I figured I'd try to fix the ASC cable in my car due to my ASC not disengaging. So, I looked under the hood and can't find anything. Seems the TU is a lot different from the M52. Although, I did find this cord that was just sitting there, and I hadn't noticed it before. I didn't take off the air box because I couldn't find any wires/cords leading to the throttle body, or at least the general area.
I've looked through a bit of threads and googled it, but no one has any information on this system for '99-'00 models. Does anyone know where this ASC cable/actuator is located? Could this cord/plug have anything to do with it?

Pictures- The first and second pictures are of the plug. I have no idea what it is, and the first picture was rotated. The third picture highlights the cord which belongs to that plug. The fourth is pretty self-explanatory.
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1999 BMW 528iT Sport- 2/1999 Build
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2003 BMW X5 3.0i-11/2002 Build-- Pearlbeige Metallic
1999 BMW 528iT Sport-10/1998 Build--TiAg
1995 BMW 325is--Slate Green

Last edited by bmdubya1198; 02-21-2015 at 12:10 PM.
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  #2  
Old 02-21-2015, 12:13 PM
HTK12 HTK12 is online now
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The thing in the first picture is the hood sensor for alarm. It should be connected in the drivers side cabin air filter housing. However picture 3 shows that the mounting point for that sensor is broken, so you can't put it there. Either live without it or get new drivers side cabin air filter housing.
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Old 02-21-2015, 12:18 PM
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bmdubya1198 bmdubya1198 is online now
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Quote:
Originally Posted by HTK12 View Post
The thing in the first picture is the hood sensor for alarm. It should be connected in the drivers side cabin air filter housing. However picture 3 shows that the mounting point for that sensor is broken, so you can't put it there. Either live without it or get new drivers side cabin air filter housing.
Well that would explain why that isn't connected. Now, I just need to find this cable.
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2003 BMW X5 3.0i-11/2002 Build-- Pearlbeige Metallic
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1995 BMW 325is--Slate Green
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Old 02-21-2015, 12:25 PM
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mjalloul11 mjalloul11 is online now
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The cruise control and ASC are built in the throtle body with no cables to replace. Only the m52 had cables.
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Old 02-21-2015, 12:43 PM
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The throttle body is located after all the rubber intake tubes. It is held onto the intake manifold by 4 bolts. There is also a throttle cable from the accelerator and a black plastic box on the left side of the throttle body with a twist lock electrical plug on that black box. The black box is where the ASC is. I know that at least one member here has take the plastic cover off the unit and carefully greased the gears inside. You can also clean the carbon from the butterfly.

This throttle body is a very expensive item. You want to handle and treat it very gently. For instance I know that people have ruined it by manually opening the butterfly and then letting it slam closed. If handled gently, all should be OK.

BTW-If you are planning to remove the unit, you'll want to buy a new gasket. A vacuum leak there would be a definite problem.

Edit-I can't remember exactly, but I think you have to remove the ICV before removing the throttle body. Nevertheless this would be a good time to remove and clean the ICV. Many DIY threads for this. Sometimes the IVC is very hard to remove. It just pulls out but sometimes it sticks hard it its rubber sleeve. If that sleeve is hard and crusty, you may want to replace that too. Everything should fit nice and snug there. As I said this is a bad place for a vacuum leak.

Last edited by johnstern; 02-21-2015 at 02:22 PM.
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Old 02-21-2015, 01:09 PM
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Thank you! I didn't know that it was actually ON the throttle body. I'm going to check this out after I get the more important repairs out of the way.
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1999 BMW 528iT Sport- 2/1999 Build
--Alpinweiß III/Sandbeige, non-stock Style 29 Wheels, Beisan Vanos Seals.

Sold Bimmers
2003 BMW X5 3.0i-11/2002 Build-- Pearlbeige Metallic
1999 BMW 528iT Sport-10/1998 Build--TiAg
1995 BMW 325is--Slate Green
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