Thanks for replying Ed.

I have a cheap RS analog meter as my Digitool meter output.  I am going to
use my Fluke as a check tomorrow.

Yes the blue water sensor on the thermostat housing is the one I am
referring to.

I believe that I have seen David Beierl refer to the 0.1 to 0.2 as normal
for his Temp II sensor.  But Darrell Boehler mentioned 0.3 to 0.4 volts.

I would like to know if the engine management software distinguishes between
the 2 different ranges.

Thanks again.

Joe Fahy

----- Original Message -----
From: "Ed DeBolt" <eddebolt@netzero.com>
To: "Helen Fahy" <72510.1173@compuserve.com>
Sent: Monday, April 30, 2001 7:25 PM
Subject: Re: Temp II voltages

>
> Hmm. I wonder if your readout is sensitive enough. with a digitool my temp
2
> operating range is typically . 14 to .18 volts. my fan comes on at .12
> volts.  when I first start my vehicle in the morning I read 1.25 volts and
> as it warms up then it decreases. I typically idle it until I get to .6 or
> .7 before actually driving.
>
> we are talking about the same sensor. the blue water temp sensor in the
> flange by the thermostat.
>
> my van an 87 2.1 will show a 02 sensor reading increase up to about .6 or
.7
> before it starts oscillating. when it starts to cycle .2 or .3 to .6 or .7
> then I figure it is in closed loop.
>
> ed
> -----Original Message-----
> From: Helen Fahy <72510.1173@compuserve.com>
> To: vanagon@GERRY.VANAGON.COM <vanagon@GERRY.VANAGON.COM>
> Date: Monday, April 30, 2001 4:21 PM
> Subject: Temp II voltages
>
>
> >I made an ersatz version of Darrell Boehler's Digitool.  Darrell was
> >charging $100 as of a few weeks ago.  This is so cheap!  His tool should
be
> >more like $2-300 for all the work it takes!  Do not forget that after you
> >build it you still have to recheck your work prior to powering up the
> >system.  I will not divulge how long I took to make my version!  If I had
> to
> >do it over again, I would not.  I would ask Darrell verrrrry nicely if he
> >would sell me one, Please!!!
> >
> >Now the question part .
> >
> >The archives have listed 2 different acceptable ranges for the Temp II
> >sensor voltage at normal operating temperature.  The first was 0.1 to 0.2
> >volts and the second range was 0.3 to 0.4 volts.  Not very much
difference.
> >
> >My Temp II is rock steady at 0.4 volts, with an indicated temperature 1
> >needle blade width below the LED,  and I can see the O2 sensor voltage
> >oscillating about 0.6 volts.
> >
> >Are these two conditions sufficient to say that the ecu is in closed loop
> >operation and that the engine is at normal operating temperature?
> >
> >I believe that the system is in closed loop operation, but I am not sure
at
> >what Temp II voltage the engine management software understands that the
> >engine is at normal operating temperature.
> >
> >Any discussion welcomed.
> >
> >Thanks,
> >Joe Fahy
> >
>