Date: Mon, 4 Jan 1999 19:24:46 -0600
Reply-To: Darrell Boehler <midwesty@MIDWEST.NET>
Sender: Vanagon Mailing List <vanagon@vanagon.com>
From: Darrell Boehler <midwesty@MIDWEST.NET>
Subject: Re: Digitool reading and t-shooting (longish)
Content-Type: text/plain; charset="iso-8859-1"
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Hi Nat,
The digitool use ecu pin 13 for ground reference on all voltage
measurements (stud near the left rear wheel well). The digifant ecu use pin
13 for all grounds except for the oxygen sensor where it uses pin 19 which
attaches just below the coil to the strap you mention that attaches to the
left head. Check the resistance from pin 13 and pin 19 to battery ground
they should be less than 1ohm. You can check at the ecu cable or the
digifant breakout connector on the tool. It appears your pin 19 is
malfunctioning and is loosing ground connection.
The above should net you a fix. However if not you may want to connect
pin 13 and 19 together on the digitool breakout connector. If you still
get a 6 volt reading your coax from the ecu pin 2 to the oxygen sensor must
shorting somewhere, or your new oxygen sensor or ecu is bad.
NOTE: for those of you with a digijet these are different pins on your
digijet ecu, so please don't connect pin 13 and 19 together on a digitool
connected to a digijet ecu, where 13 is + battery.
Darrell
-----Original Message-----
From: Nathaniel Merrill <nmerrill@PARAMETRIX.COM>
To: vanagon@VANAGON.COM <vanagon@VANAGON.COM>
Date: Monday, January 04, 1999 6:41 PM
Subject: Digitool reading and t-shooting (longish)
>To the wisdom of the masses, a question:
>Fortunately or not, the problem which had been very intermittent (usually
only after several days of sitting) has now become rather regular, now that
I have a Digitool to play with:-)
>After startup, the bus (91 syncro) may idle fine for a bit but then begin
to sputter (lower idle). driving is impossible (no throttle is accepted -
only kills it more) Shut down and restart results in temporary perfect
running (30 sec?) then more of the same. After several cycles of restarts
and high revving acceleration (during the short grace period) the problem
vanishes for the rest of the day's driving (at least until recently, now it
may have fits after every shut off even if for 10 min- IE still warm) So
what of the Digitool? Everything but the Oxygen sensor reads as they always
have. Recently, I had a chance to monitor while the bus was having fits
regularly after shut off (after the 30 second grace period). After a 45 min
highway drive we shut it off for a half hour then tried to leave. The oxy
sensor was reading 6+ volts and slowly dropping while the bus sputtered.
Slowly the volt would approach the expected 0.6 range and begin to fluctuate
as usual (0 to 0.6 volts) and the bus fit would be over. This would repeat
itself to varying degrees. This problem seems to be associated with rain.
The Oxy is new (10K mi./Bosch) and when not having a fit the oxy seems fine
and the bus runs fantastic. I recently removed the ground strap to the
left head and cleaned and replaced during a real bad fit episode.
> What's up?
>Nat
>Seattle
>
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