Date:         Sat, 12 Mar 2005 12:33:33 -0600
Reply-To:     Chuck Mathis <cmathis@HOUSTON.RR.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Chuck Mathis <cmathis@HOUSTON.RR.COM>
Subject:      Digijet O2 Sensor Wiring Issue
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'85, 1.9l Digijet, Automatic.

While trying to get Roland ready for the state emissions check I
replaced the O2 sensor.  I tried setting the AFM per the instructions
posted a few weeks ago and all the readings were good - O2 staying
between .4 and .5 at idle reading with a multi-meter with the sensor
disconnected from the system.  The engine ran like a champ until I
plugged the sensor back in and tried to zip off to the test station --
suddenly it has no power off idle and the O2 readings on my digitool
are going negative at the same time.  Figuring it must be a short in
the fat green wire i disconnected the ECU and pulled the cover off the
plug.  With one probe in pin 5 and the other in the female connector on
the wire it reads 0 resistance and no amount of bending, twisting and
turning the green wire changes that - seems like that should cause the
resistance to increase if there is a short.  The shielding checks out
with a big fat 0 and between the shielding and the conductor I get an
infinite reading probing both ends in various combinations.  There is a
white wire spliced to the green that runs to pin 6.  With the probe in
pin 6 and the green female I get infinite resistance.  Same with the
probes in 5 and 6, 5 and the splice, and 6 and the splice.

 From all this poking around I believe that the shielded green wire is
just fine and the white wire to pin 6 splice is bad.  Am I right or do
I need more beer? (I'll have a beer anyway)  What is the best way to
fix this?  I'm thinking remove the insulation from the splice, solder
it then wrap it up good.

Chuck
'85 Wolfsburg Westy - 'Roland the Road Buffalo'