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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 09-04-2009, 10:45 AM
jenjc jenjc is offline
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Location: Marietta, GA
 
Join Date: Feb 2009
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Mein Auto: 2002 BMW 530i, Sport!
P1633 -- Throttle Limp Home, why?

Hello --

I'm driving a 2002, 530i. Sport and Premium packages with a 5-speed manual transmission. Mileage around 115,000.
  1. Two weeks ago the ABS, Brakes and ATC lights came on and went away.
  2. I read up on ABS modules, brake pads and other things.
  3. We replaced the brake pads and no more lights (hey, it was the cheapest option).
  4. Yesterday, the ABS, Brakes and ATC lights came on again. Then, went away. I tried reading codes. Nothing.
  5. Today, I fire up the car. Service Engine Soon and Engine Failsafe Mode come on.
  6. Code read = P1633: Throttle Limp Home mode.

Is there anything logical that strings this series of unfortunate events together (and what does the throttle have to do with the brakes anyway ;-)?

Thanks for your help in advance.
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  #2  
Old 09-04-2009, 11:20 AM
Mark@EAC Mark@EAC is offline
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Location: NW Indiana USA
 
Join Date: Nov 2008
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Mein Auto: e39 5
what kind of code reader are you using? There are many modules on your car that your average obd-II scanner cannot read. I am thinking your ABS system is to blame. Open the hood and have someone start the car. There is a device on the intake that closes when the abs system tells it to. this device does a test at start up. if it's not moving there is a problem.
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  #3  
Old 09-04-2009, 09:31 PM
edjack edjack is offline
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Mein Auto: '97 540i 6 speed
"There is a device on the intake that closes when the abs system tells it to. this device does a test at start up. if it's not moving there is a problem."

What is the "device"?
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  #4  
Old 09-04-2009, 09:37 PM
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bmw_n00b13 bmw_n00b13 is offline
Freude am Fahren
Location: Cambridge, ON
 
Join Date: Feb 2008
Posts: 6,372
Mein Auto: 99 528iA
I believe it's the DSC throttle; the DSC system is able to both increase and decrease torque to the rear wheels to prevent loss of control. ABS lights on probably throw this code; having the codes read by a Peake (I think they read ABS codes) will clear some things up. It wouldn't hurt to have a GT-1 read it (except in the wallet).
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  #5  
Old 09-05-2009, 08:53 AM
jenjc jenjc is offline
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Location: Marietta, GA
 
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Mein Auto: 2002 BMW 530i, Sport!
I read the codes with your basic, garden variety code reader. Seems like I should suck it up and take it to someone with a real reader to figure out what is going on.

And... if I'd taken 30 seconds to think, I would have figured out the connection between brakes and throttle. Now that I'm thinking, is it possible that when we replaced the brake pads, we didn't do something with respect to the sensors in the brake pads and the rest of that system (DSC, ATC, ABS)?

Thanks!

Jenny
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  #6  
Old 11-01-2014, 07:30 AM
seaforth399 seaforth399 is offline
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Location: scotland
 
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Posts: 2
Mein Auto: e46 320i
hi, I had same problems same lights on and car in limp mode. Changed throttle body and cleaned idle valve at same time, car runs better than ever , quick fix ,about one hour and got second hand throttle body for 20 . cheap easy fix with positive results
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  #7  
Old 11-01-2014, 11:31 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
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Posts: 22,012
Mein Auto: 02 BMW 525i M54 auto 130K
For the trifecta, type /trifecta f3 in the bestlinks.

Lots comes up, by try this one post first:
- How to diagnose the BMW amber ABS BRAKE DSC/ASC trifecta or bifecta (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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