Date:         Fri, 26 Sep 2008 14:31:30 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Question about testing O2 sensor with digital meter
Comments: To: Jim Felder <jim.felder@gmail.com>
In-Reply-To:  <4d1b79350809261059w659fd254gd7595d6aefa6442e@mail.gmail.co m>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 01:59 PM 9/26/2008, Jim Felder wrote:
>I'm about to take the car out for an errand. I'll disconnect the O2
>sensor and check the Temp II when I get back and it's warmed up. I
>just put a new Temp II in this morning, BTW.
>
>What's the procedure for testing it?

One lead should be ~0v (ground), the other should be ? couple volts ?
at room temp, maybe a tenth or so at running temp.  As I said, if
both leads zero you're not getting the pullup from the ECU; if both
leads ? 5v ? then open ground; if one zero and t'other +5 then open
sender.  Resistance btw (disconnected) sender terminals should match
the chart in Bentley.

If the ECU is seeing a continuous high voltage it will believe the
engine is dead cold and act accordingly.


--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage," '85 GL "Poor Relation"