Throttle Body Clean and Reset

A dirty throttle body can cause all sorts of running and idling issues. I decided to do mine because it'd never been done, and I was getting a flat spot at about 3000rpm when accelerating.

This is the throttle body, bolted to the inlet manifold
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Removed from the car. It doesn't look too mucky.

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I bought a gasket ages ago but never got around to doing this job. When I needed to do it I couldn't find the gasket anywhere! I decided to go ahead and risk it without, and the old one came out like this:
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Fortunately I found the one I'd bought after a bit more searching
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After cleaning with carb cleaner, a cloth and some cotton buds
  IMG_3100-2
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I think the alignment was a little out!!
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Here's how to do the alignment using VAGCOM or VCDS. Borrowed from here

Throttle Body Alignment 
Updated  29 Jan. 2007

Ross-Tech is not responsible for any damage or problems that may result from following these instructions. They are to be used at your own risk. As always, you should refer to a Factory Repair Manual for your vehicle!

This procedure details how to perform a Throttle Body Alignment (TBA) on many VW/Audi vehicles. This procedure cycles the motorized throttle body through various states (idle, part throttle, WOT) to relearn their positions. Some examples of reasons to perform a TBA:

  • The vehicle's battery has been disconnected and re-connected

  • The ECU has been removed and reinstalled

  • The Throttle Body has been cleaned or removed and reinstalled

  • The Accelerator Pedal has been removed and reinstalled

In some vehicles, the car will not run correctly, or may not run at all without performing a TBA after one of the above operations. The TBA can be performed on both Drive-By-Wire (DBW or E-gas) as well as Cable-throttle cars as long as there is no Idle Stabilization Valve (ISV). If there is an ISV, then there is no motorized control of the throttle at all. Typically, '96-'99 VW/Audi have motorized Cable-throttle, and '00+ VW/Audi have DBW. Obviously, there are some exceptions. This should be obvious but TDI's do not have throttle bodies.

There are certain test conditions that must be met before doing a TBA:

  • No DTC's in the Engine Controller

  • Battery voltage at least 11.5 V

  • Throttle must be at idling position (keep your foot off the gas pedal)

  • Throttle body part must not be dirty (carbonized).

  • Coolant temperature must be between 5 and 95C


Procedure for performing a Throttle Body Alignment on Cable-Throttle Cars:
These are cars with a physical cable between the accelerator and the throttle, but WITHOUT an ISV.

Turn the key on but do not start the car.

[Select]
[01 - Engine]
[Measuring Blocks - 08]

Group 098 (Note: Some SIMOS or Marelli ECU's use Group 001 such as  ADY & AEE engines)
[Go!]
[Switch to basic settings]

Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switch to basic settings. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.
[Switch to Meas. Blocks]
button and you're all set.

Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!


Procedure for performing a Throttle Body Alignment on DBW Cars using KWP-1281:
(Check to see if the engine speaks KWP-1281 by looking in the top left of the Open Controller Screen Some examples of KWP-1281 engine controllers are 2000+ Golf/GTI/Jetta/New Beetle/Audit TT 1.8T)

Turn the key on but do not start the car.

[Select]
[01 - Engine]
[Measuring Blocks - 08]

Group 060
[Go!]
[Switch to basic settings]

Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switch to basic settings. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.
[Switch to Meas. Blocks]
button and you're all set.

Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!


Procedure for performing a Throttle Body Alignment on DBW Cars using KWP-2089:
(Check to see if the engine speaks KWP- 2089 by looking in the top left of the Open Controller Screen Some examples of KWP-2089 engine controllers are 2002+ Audi A4, 2002+ VW Passat, and Touareg)

Turn the key on but do not start the car.

[Select]
[01 - Engine]
[Basic Settings - 04]

Group 060
[Go!]
It should say "Basic Settings: OFF" on the top of your screen.
Click [ON/OFF/Next] to turn on Basic Settings.
It should now say "Basic Settings: ON" on the top of your screen.
Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switched basic settings on. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.
Click [ON/OFF/Next] to turn off Basic Settings.
It should now say "Basic Settings: OFF" on the top of your screen
Click the [Done, Go Back] button and you're all set.

Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!

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