of VAG-COM and 200q20v's (part one)

[Brett Dikeman]

At 11:57 PM +1300 2/18/01, Dave Eaton wrote:
>the warning on the 5-minute period is valid for all 20vti5's of which i'm
>aware (aan, rr, aby, adu).
>
>following is the table from the manual which explains the values.  as i've
>said some of these changes for later motors and motronics.  following is for
>the 3b/rr.

right, I have the bently set, I had to use the same table to interpret values.

>based on the numbers you posted, lambda seems ok.  to check, remove the
>connector and check voltage with ignition on.  it should be 450 +/ 50mv.

To me, the adaptation value for the O2 sensor seems towards the 
bottom of the acceptable range, when during multiple sessions, every 
other value is smack dab on the money, with one exception...friday 
afternoon, the value for 7 was low.

Mostly what I suspect is that the sensor is slow, but there's no real 
measurement from the ECU that reflects that :-)  It seems to match, 
however, the rough idle, which will bounce back and forth slightly, 
but occasionally drops, labors, and recovers.  I won't really be able 
to tell if thats' the case unless I were to hook up an oscilloscope, 
a recording DMM, or replace the sensor(I've been seriously 
considering the last two.)

In any case, I've gone about as far as I can without testing 
resistances and voltages across the board and simply eliminating 
things one by one; I was hoping that VAG-COM would save some time. 
Oh well.

Brett
-- 
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Brett Dikeman				Systems Engineer
ProAct Technologies Corporation		914-872-8043
(formerly CFN[formerly iClick, Inc])		914-872-8100(fax)
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