O2 sensor

[neilaura at accessworldnet.com]

At 09:36 AM 3/15/99 -0800, you wrote:
>
>
>> -----Original Message-----
>> From: owner-diy_efi at efi332.eng.ohio-state.edu
>> [mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of
>> cwagner at info2000.net
>> Sent: Sunday, March 14, 1999 7:24 PM
>> To: DIY_EFI at efi332.eng.ohio-state.edu
>> Subject: O2 sensor
>>
>>
>> I have a question about how to tell when the computer is in closed
>> loop mode when a person doesn't have a scan tool.
>> I built one of the O2 sensor gauges using the LM3914 chip.  What
>> should I be looking for to tell when closed loop is on?  From what I
>> have read, I should see the gauge fluctuating several times a
>> second (or as close as the eye can tell).  Also, with the O2 sensor
>> disconnected from the computer, the O2 sensor does not send a
>> voltage during idle even though it is a heated sensor.  I find this
>> interesting.

Can anyone help me out with details about building a sensor guage from a
LM3914 chip?.

Many thanks

Neil