Currently, the program is offered in Windows format and the latest versions are even Windows Vista compatible. Many different models are available, with prices starting around $229; as the cost increases, so does the compatibly and speed of the units.
In addition to various options, free software upgrades are available. Furthermore, Ross-Tech will buy back your old equipment, allowing you to upgrade to a newer model hassle free.
Not only is VAG-COM an essential electronic toolbox for any VAG enthusiast's garage, but in some cases it's a necessity for the home mechanic. For example, the new Passat requires a computer to release the rear brake pads from the electronic parking brake.
Replacing mechanical tasks with electronic processes is a trend that's here to stay, and this tool will be invaluable in the coming years. The microprocessed era is upon us.
Project Silverstone Testing
When we planned this VAG-COM review, our project GTI coincidently passed 100k miles, so we thought it a good idea to scan the ECU for fault codes. We took the car to Dynamic Racing Solutions (DRS) in La Habra, CA to see how the professionals would diagnose the car using VAG-COM.
DRS helped with Project Silverstone in the 1/07 issue by successfully installing and dyno-testing a Kinetic Motorsport turbo manifold. With their experience and knowledge, they were an easy choice to show us the versatility of VAG-COM, a tool they commonly use to diagnose the problems in a customer's car.
After a few minutes of demonstration, no major faults were detected on our GTI. Yet we were surprised how easy it was to use VAG-COM. If you have the ability to connect cables and start a Windows-based program, you'll have no problems. The interface is simple to navigate and there's no element of the tool that could damage your car.
If you have extensive mechanical knowledge or are just starting, we'd recommend VAG-COM to complete your toolbox, just in case a CEL strikes!
Auto Scan
From the main menu, you click 'Auto Scan'. This scans for faults in areas including the engine, transmission, climate control, ABS and more. For our test, it took about three minutes to run.
Engine Scan
More commonly used by DRS, you click 'Select Control Module' from the main menu. In the next menu, you're given a list of common parameters - the engine is the first one. After selecting 'Engine', it quickly scans for fault codes related to the motor. This process took seconds on our GTI.
Clearing Faults
After any scan is over, you can save fault codes to a document, print them and clear them from the ECU, which will eliminate the CEL. If it was a minor fault, it saves you the money spent on a visit to the dealer. If it was a major fault, the VAG-COM can only offer limited information, but it's a good first step and there are still things you can do to narrow down the problem. For example, a misfire is common with the 1.8T. This might stem from an ignition, fuel or vacuum problem. It's best to also have a Bentley manual handy to help with the next task of fixing the fault.
Measuring Tools
Under the engine scan menu, there's an option for 'Measuring Blocks'. While the ignition is on or while driving, you can read various measurements such as coolant temp, ignition timing, mass airflow, throttle angle and more. Within this feature, you can plot the variables on a graph using 'VAG-Scope'. As with the fault codes, you can log the data and save it.