Online Demo / Manual
Corresponds to VAG 1551/1552 function 08
On this screen, you can read all sorts
of data from the Control Module in real-time. You
may also want to try the Advanced Measuring Blocks function, which frees you from
the grouping format of the Measuring Blocks function. For
controllers using the UDS/ODX/ASAM protocol, the Measuring Blocks
function is not available and you MUST use Advanced Measuring Blocks
For vehicles with dual
ECU's (like the Audi R8), data from both ECU's can be viewed
simultaneously by accessing
[31-Engine Other] as shown here:
[Up] and [Dn]
to scroll through the available groups (000 - 255 on most Control
Modules). Don't become discouraged when you find some that say "ERROR:
Group xxx Not Available" or if you find some groups where the fields are
all blank. Most 1996 and newer ECUs have Groups through the 200 range, but
there are often "gaps" in the numbers.
You can also type a Group number
into the Group box and click [Go!]
If you'd like to record just a snapshot of the current
readings in each group, click on
[Add to Log].
This will save the results to your PC, typically in in your VCDS\Logs
When you have one or more measuring group
with speed (km/h) in it, clicking on
will bring up the Acceleration Measurement function, which is described
on the Acceleration Measurement page.
[Log] the data from the
measuring blocks. For more information see the Data Logging page.
can be used to go to the Basic Settings
the Group that is currently being displayed. This should be done only
under guidance from the Service Manual or when following some other
documented procedure. For more information see the
Basic Settings page.
Multiple Groups are not permitted in Basic Settings. The
[Switch To Basic Settings]
button is intentionally disabled if you have groups "running" in the
second and third rows. The button is also disabled on controllers using KWP-2000/CAN/UDS. On those, you
need to go directly to the Basic Settings screen. To stop a running group, click on the box that
displays the group number (as though you wanted to enter a new number).
The data presented in each Group varies greatly from Control Module to Control
Module and between different models and years. Some groups are
documented in the Factory Repair Manuals, but many are not. Feel free
to explore the Control Modules in your car by scrolling through all the
Groups. You can't hurt anything with the Measuring Blocks function!
VCDS will attempt to "scale"
the raw data coming from the Control Module into real-world units like degrees C, km/h, etc. At the present time, all
scaling conversions are to metric (SI) units.
Group 000 and any other
group that displays 10 fields instead of 4 is an exception. No scaling
is possible because the Control Module provides no "Data Type"
information with the data for these. Groups of this type can only be
displayed in the top row of the screen.
VCDS also tries to elaborate as
much as possible what the data means. Unfortunately, the "Data Type"
information coming from the Control Module is not that precise. For
example: VCDS can tell that a particular field contains a
Temperature, but the data from the Controller doesn't tell us whether
this is the Coolant Temperature or the Intake Air Temperature.
To reduce the confusion, VCDS
supports Label Files and will display the name of the Label File. The
Label File name is displayed on the top left when you are in Measuring
Blocks or Basic Settings. If a label file is present then you will be
able to use the Advanced Measuring Blocks
If you click on the name of the Label File,
the file will open in Notepad or whatever program you have set to handle
*LBL files. The newer encrypted *.CLB files cannot be opened in the same
manner. When a
Label file for the Control Module you are looking at does not exist,
VCDS will come up with an "educated guess" for what a particular Data
Type means. The dealers' VAG-1551 and 1552 scan-tools do not provide any
elaboration; they only show what’s in the display fields!
For more information see the Label Files
Group 000 supports special Labels. Due to
space constraints on the screen, these labels are displayed in a
"balloon" when the user hovers over a field:
Label Files also allow a third label
field to be defined for each of the normal measuring block
fields. This label is displayed in a balloon when the user
hovers over a field. The idea is to put "specified values" in
may not be willing to produce more than about 3.5 samples per
second when running a single group, even with
the most aggressive
Other ECUs may be much faster. Except on the
slowest most ancient PCs, this is a limitation inherent in
the firmware in the ECU, not a limitation in the VCDS
software or the PC. Naturally, if two groups are being displayed
simultaneously, the sample rate drops about half what it was
running a single group, and 3 groups
simultaneously runs at around 1/3. Sample Rate will vary from
controller to controller.
Some controllers (particularly AG4 transmissions and Digifant-III ECU's)
use a "hybrid" data-type that requires reading a long header when
changing group numbers. Viewing multiple groups still works with these
data types, but the sample rate becomes extremely slow. If you see
"Reading Header" all the time under the Sample Rate display, you'll know
you've got one of these.
In Engine controllers using KWP-2000
,CAN or UDS, there is a
[Turbo] button in
Measuring Blocks screen. Pressing this
button can significantly speed up sampling, for example over 30
samples per second when logging a single group in the engine controller in an early V8 Touareg. Once you have pressed
[Turbo] you will
remain in this High-Speed mode until you exit the Measuring
Blocks screen. Some combinations of ECUs and PCs may not play
well with this function so if you get undesirable results
like a dropped session or bogus data, you should exit out of
the controller and get back into Measuring Blocks but
without clicking on [Turbo]. This function is only available when using a HEX
is used to open up VC-Scope, a plug-in for VCDS
that allows you to graph Measuring Blocks Information and displays
customizable virtual gauges. For more information, see the
[Done, Go Back] to return to
the Controller Information screen.
If you wish to observe real-time data while driving the car, please use
a second person! Let one drive while the other observes the data,
making sure the person holding the PC is not in front of an active
Online Demo / Manual