Throttle must be at idling position (keep your foot off the gas pedal).There are certain test conditions that must be met before doing a TBA: This should be obvious but TDI's do not have throttle bodies. Typically, '96-'99 VW/Audi have motorized Cable-throttle, and '00+ VW/Audi have DBW. If there is an ISV, then there is no motorized control of the throttle at all. 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). 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 Accelerator Pedal has been removed and reinstalled.The Throttle Body has been cleaned or removed and reinstalled.The ECU has been removed and reinstalled.The vehicle's battery has been disconnected and re-connected.Some examples of reasons to perform a TBA: This procedure cycles the motorized throttle body through various states (idle, part throttle, WOT) to relearn their positions. This procedure details how to perform a Throttle Body Alignment (TBA) on many VW/Audi vehicles with Gasoline engines. As always, you should refer to a Factory Repair Manual for your vehicle! Ross-Tech is not responsible for any damage or problems that may result from following these instructions.
