Measuring block 000 in 3B engine in the '91 200 20V

Matt twentyV matt_20v at
Wed Apr 16 09:08:13 EDT 2003

It was me that started this.. trying to debug a rich
condition using Vag-Com.  The table below is straight
from the Bentley, page D2-440.  The pages following
that suggest repair actions and refer to other
appropriate sections of the Bentley.

I did play with this some more last night.  You can
access the block 0 data using either function 8
(Measuring Blocks) or function 4 (Basic Settings).
The Vag-com screen is the same in both cases.  Just
enter "000" for the group number.  Vag-scope is
fully operational from either location, however it
is not terribly interesting as the good stuff like
boost and torque are not available.  The logging
function is grayed out however, the Vag-Com
documentation states the function is not available
for groups returning 10 channels of data.
Group 0 seems to be the only one supported by the 3B.

My initial confusion was created by the "single
reading" function 9.  It returns different data as
you scroll the "channel" number from 1-10.  Almost
looks like the group 0 data, enough to fool me
for a while, but it isn't.  No idea what the numbers
are.  They do change as you blip the throttle or

BTW I still see channel 9 at 160 or so.  Investigation
continues, any suggestions welcome.  I'd still like
to see a dump from someone else with a Lehman chip.

Matt Rooke

--- Steve Eiche <seiche at> wrote:
> Someone asked for measuring block value for the 3B a
> day or so ago.
> FWIW, our ProDiag system has the labels for block
> 000 on the 3B.  These
> are the same for the AAN/ABY/ADU engines as well I
> believe. Here is the
> data:
> Chnl Description  Values     Corresponds to:    Use
> 1    Engine temp. 184-215     85-105C
> Temp. sensor on head
> 2    Engine load  20-25      (boost @RPM?)      Air
> leaks in system
> 3    Engine RPM   77-83 (idle)RPM/10            Only
> read to 2550RPM
> 4    IAC range    121-135     idle valve range  air
> leaks or excess load
> 5    IAC 0 point  80-125      calc'd by ECU     IAC
> leaks or faulty IAC
> 6    IAC adaption 123-127     Quant. IAC change Air
> leaks
> 7    IAC control  41-55       calc'd by ECU     Air
> leaks or faulty IAC
> 8    O2 control   123-133     02 sensor reading O2
> sensor and mixture
> 9    O2 Adapt.    115-141     ECU 02 adapt. val
> Mixture, MAF, air leaks
> 10   Timing       35-37 (idle)8-12BTDC
> Timing check
> See the Bentley manuals for the best use of this
> data.  FWIW, all of
> this data can be very useful in diagnosing 3B
> behavior, even if you are
> not setting DTCs.  For example, a dead temp sensor
> on the head can
> easily be found by looking at the value of Channel
> 1.  O2 can be
> monitored by channel 8.  Vacuum/boost leaks can be
> discovered with the
> IAC (Idle Air Control) channel readings.  Tuners use
> the O2 sensor and
> timing readings for quick verification of their
> code.
> HTH!
> Steve Eiche
> Shade Tree Software, LLC
> _______________________________________________
> 200q20v mailing list
> 200q20v at

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