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.
Note: These are useful procedures that may or may not
work on your particular vehicle. Consult a Factory Repair Manual before
doing any modifications to your car.
Q: What is VCDS?
VCDS (VCDS Diagnostic System) is
Windows-based software that allows a PC to act as a diagnostic tool for
Q: That's great, so what
can I do with it?
Well, here is a partial list:
Control Unit Info (means you can read your
ECU's part number without pulling it out)
02 Read Fault Codes (aka DTC's, you can find out why your MIL - aka
CEL - is on)
03 Output Tests (as part of troubleshooting procedures, you can turn
on various actuators)
04 Basic Settings (lets you set readiness, perform various functions)
05 Clear Fault Codes (lets you get rid of the DTC's)
07 Code Module (lets you to set up the "BIOS" of a control module)
08 Measuring Blocks (lets you measure various running parameters)
10 Adaptation (lets you adapt or introduce components to one another)
11 Login (needed to access certain functions)
15 View Readiness (checks to make sure self-tests have been done)
Data Logging (you can save measuring blocks to a file - up to 3
groups of 4 at a time)
7-Digit PINs (used for new keys, instrument clusters, or new ECU's)
specifically, as relates to my 1.8T , what can I do with
Idle Speed Adaptation:
With engine warmed up, at idle:
[Adaptation - 10]
Enter channel 01
Enter an adaptation value between 124 and 132
Throttle Body Adaptation:
Turn the key on but do not start the car.
[01 - Engine]
[Measuring Blocks - 08]
Group 060 (Group 98 in non-DBW engines)
[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 mode for about 30 seconds, then switch back
to normal settings and you're all set.
Be sure not to touch the accelerator and make sure the engine is NOT running
when you do this!
Activating Cruise Control on a
new ECU (DBW):
Factory fresh ECU's often come with
cruise control de-activated.
[01 - Engine]
[Login - 11]
Enter 11463 to activate cruise control
Installing a new ECU:
Immobilizer Procedures in the Ross-Tech Wiki
Q: Where can I
find specific info about my car?
First off, the best source is the
aforementioned Factory Repair Manual. See
here for some useful links for particular vehicles:
& Audi Application Charts