Common Diagnostic Procedures
Updated  13 Jan. 2009

These pages detail some common vehicle-specific procedures that can be performed with VAG-COM. These are not a substitute for the correct Factory Repair Manual for your vehicle. 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. We will be adding more pages periodically and welcome any comments or suggestions to Support@Ross-Tech.com

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Ross-Tech Wiki - This is an encyclopedia of information such as common Fault Codes and Diagnostic Procedures. (Beta - This site is continually having content added and will eventually be the primary resource for information on usage of VAG-COM)
Add Ross-Tech WIKI to your Browser Search Engines!

OpenOBD (Excellent VW/Audi information resource created by Sebastian Stange)

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Application Charts showing Which Interface works with each vehicle
 (Which controllers are in my car and where do I find the diagnostic port?)

Possible DLC Locations

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Platform Information Pages

2005.5+ VW MkV Jetta/Rabbit/GTI	2004+ VW Touareg
1998-2004 VW MkIV Golf/Jetta/New Beetle	2008+ Audi A5/S5 (8T/B8) 2008+ Audi A4/S4/RS4 (8K/B8)
2006+ VW Passat B6	2002+ Audi A4/S4/RS4 (B6/B7)
1998-2004 VW Passat B5	1995-2001 Audi A4/ 2000-2003 Audi S4 (B5/8D)

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Immobilizer Information for VW/Audi/Seat/Skoda (information about how  Immobilizer works and what procedures are available to deal with it)

Important Note: Unless you ALREADY have the SKC information for your vehicle and components then you will NOT be able to do any of the Immobilizer functions.
Click this link for more information.

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Common procedures

Some useful off-site links

Some excellent Excel spreadsheets that use data from VAG-COM (thanks to ukaussi@cox.net ). Right-click, save-as:

Air/Fuel calculation spreadsheet - This generates an A/F graph from injector pulse widths, airflow, etc.  Block 120 spreadsheet - This generates a Horsepower and Torque graph using the calculated torque values output by Bosch ME7 ECU's.  Block 115 spreadsheet - This generates a boost graph using the MAP sensor readings for drive-by-wire 1.8T and 2.7T engines.

Stoney's Audi A6 FAQ
All sorts of AudiWorld threads about diagnostics.

Paul Waterloo's AudiPages Audi A8 Transmission Coding Page
Transmission recoding for sportier performance.

The Fuel-Injection & Ignition manual for the Tiico Vanagon conversion
Of interest to anyone with an MP9 Fuel Injection system (13 MB pdf)

The "Butt Dyno" Spreadsheet
How to calculate wheel horsepower and torque from acceleration and deceleration data.

Shiftpoints Analysis Spreadsheet
How to determine shiftpoints for optimal acceleration.

Hardcopy
Freeware screen printing utility

http://forums.audiworld.com/allroad/msgs/32165.phtml
A great thread on using VAG-COM to permanently alter Audi Allroad suspension height. This is also known as the 402 Mod.

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Good sources to learn more about what you can do with your car:

Bentley CD's and Scan Tool Companion

Ross-Tech Sponsored Forums:

VAG-COM Yahoo Discussion Group (This is the official forum for VAG-COM Support)

AudiWorld VAG-COM VW/Audi Computer Diagnostics Forum

VWVortex VAG-COM Diagnostics Forum

VAG-COM user Dave Coughlin's S4,
ready to run in the 2002 One-Lap

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