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post #1 of 12 Old 9th October 2008, 10:17 AM Thread Starter
r tuned
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Idle Actuator

a week or 2 ago my 2007 (06/06 ) e60 m5 introduced me to a couple of error msg's after ~28,000 kilos and 2 and a half years of motoring.

please check this thread for more info regarding the msgs.

anyway, after diagnosing the problem it came to my attention that the "idle actuator" or "idle actuator speed control" have failed in bank 1 only.

could someone explain to me and M5board the following:

- what exactly is the job of this part?
- what would cause this part to fail?
- why didnt the idle actuator in bank 2 didnt fail as well?

if i wasnt mistaken this part has something to do with controlling the air thats going in (please explain and correct me if im wrong or unclear.)

regards,
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post #2 of 12 Old 9th October 2008, 12:00 PM
djjm5
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Red Face Idle actuator

I'm new to the board, and have been lurking for a while. 2008 Black M5 6 speed.

My last car was an E39 540i, which was really great fun, and I spent most of my time under the hood refurbishing it, until it was totalled in a freeway accident!

Typically the idle actuator,or older Idle control valve, would regulate the amount of air entering the engine at idle and adjust as appropropriate to steady the idle and adjust depending on the engine load, i.e. air con etc.

The older V8's only had one valve so I am not familiar with the two actuators here. also I'm guessing that as we have a throttle for each cylinder the mechanism for regulating the idle air has to be a bit different.

sorry, not much help but i was intrigued by the fact that there are two actuators, and to be honest a bit surprised at all the errors you got from it.

DJ
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post #3 of 12 Old 9th October 2008, 07:36 PM Thread Starter
r tuned
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thank you for the info and welcome to the board im really sorry about your accident!

would air intakes cause an idle actuator to fail (after time?)? or maybe a sandy/winday day?

also, why would DSC or the start assistant control fail to operate ? DSC is related to traction/stability and the start assistant control is what cause the car to roll when you lift your foot of the break, unless if they have other jobs to control that im not aware of?!

i know its alot of questions and maybe stupid, but im really interested to know more about


again welcome to the board and happy M5-ing

.. mic. off to you djjm5 and the board :p
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post #4 of 12 Old 9th February 2009, 05:29 AM
ttaillon
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Sorry for digging up an old thread r-tuned. I searched on "reduced power" and your error messages sounds exactly like something that is happening to me.

First time I was cruising highway speed, downshifted and went to accelerate and the car went dead. Warning lights all over, reduced power, EDC error, etc. RPMs were cut to about 4500. I pulled to the shoulder, restarted and everything went away.

I went to the dealership and they replaced an oxygen sensor...although that was an error message (increased emissions) I had been getting off and on before this incident.

Then the other day I am coming out of a toll plaza, coming up through the gears, and the car goes dead again. Exact same thing...reduced power, EDC error. Restart the car and it goes away???

So now I'm thinking maybe it has something to do with the rev limiter. As in maybe mine is not working properly and the car goes into limp mode rather than the rev limiter kicking in. So I intentionally bring the RPMs up to see if it will happen again but it doesn't.

My question for you is, when this happened to you, did it store a fault code for your service advisor? Apparently there was something wrong with my oxygen sensor, but that obviously didn't solve my problem and there are no error messages right now. I imagine they'll tell me nothing is wrong if they can't find a fault code.

Thanks...
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post #5 of 12 Old 9th February 2009, 06:13 AM
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TTailion,

I just had to deal with this Idle Actuator problem with my car it threw a fault code 2B24. I first had the tech upgrade my software to see if that would fix the problem, but that didnt work so they finally replaced the Idle Actuator and my car was back to normal.

Below is the bulletin about the error code. This is an Idle Actuator DME problem that happens intermittently we already done all our research and I dont think your tech knows about this.


BMW TSB # SI B 12 19 08 Engine Electrical Systems

SUBJECT: S85 - Power Reduction with Idle Actuator Faults Stored

MODEL: E60 M5 from SOP up to 3/08

E63, E64 M6 from SOP up to 3/08

SITUATION: The Service Engine Soon light (MIL) is illuminated. The engine power reduction mode is activated with any of the following idle actuator (LLS) faults stored:

2B0E: idle actuator, monitoring bank 2

2B0D: idle actuator, monitoring bank 1

2B23: idle actuator, governor monitoring, bank 1

2B24: idle actuator, governor monitoring, bank 2

CAUSE: Certain engine operating conditions could lead to overheating of the idle actuator (LLS) motor electrical components.

If the engine is operated at low load conditions with the idle actuator open and the throttle valves positioned at less that 10% (constant-speed highway driving, for example), the idle actuators could fault.

When the idle actuators (LLS) remain steady in the open positive during this type of driving, it is possible that the contracts on the LLS motor commutator may begin to degrade and cause operational faults.

CORRECTION: The DME software has been improved to include a "wiping function" of the LLS, beginning at a 3% throttle opening. This functional change in the LLS control will help maintain the electrical integrity of the internal motor contacts.

On a customer complaint basis only, reprogram the vehicle with the latest version of Progman.

This DME software improvement is included with integration level E060-08-03-500 and higher.

In the event that one of the idle actuators continues to fault after the DME programming, it will then be necessary to replace it.
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post #6 of 12 Old 11th February 2009, 04:15 AM
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Rab Dog,
Thanks so much! That was extremely helpful. My dealership has been great to me and I wouldn't complain about their service, but it can be difficult to solve a problem that I can't explain exactly how to duplicate. I'll bring this information to them and hopefully it will be the end of it.
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post #7 of 12 Old 9th July 2014, 03:46 AM
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Hey guys. I'm having a similar issue with my car, and have had it into the dealership multiple times. The dealer can't replicate it, though. Do you guys know how to make it happen? Mine usually does it right when the car is started, but the car is being well-behaved for them. Thanks!

2006 Black M5

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post #8 of 12 Old 9th July 2014, 04:13 AM
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Quote:
Originally Posted by tmccann2 View Post
Hey guys. I'm having a similar issue with my car, and have had it into the dealership multiple times. The dealer can't replicate it, though. Do you guys know how to make it happen? Mine usually does it right when the car is started, but the car is being well-behaved for them. Thanks!
Any error codes?
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post #9 of 12 Old 15th October 2015, 01:45 AM
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I am also having this problem. Maybe this is to old of a thread to restarts or maybe there is a newer one out there.

These faults are defiantly due to the actuators failing.

As I have found out that it is just the gears in the actuator itself. I have found a guy on eBay that has recreated these gears and I will replace them and see if this fixes this problem.
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post #10 of 12 Old 15th October 2015, 02:34 AM
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^I would buy new ones instead. It's not worth it replacing the gears since the electronics will fail soon after. Plus, odometergears.com is selling them $225.

Btw, idle actuators are different from throttle actuators.

-Khánh
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