Date: Wed, 13 Nov 2002 19:19:46 -0500
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: O2 Sensor Readout
Content-type: text/plain; charset=US-ASCII
-----Original Message-----
From: Dennis Haynes [mailto:dhaynes@optonline.net]
Sent: Tuesday, November 12, 2002 8:11 PM
To: 'Jay L Snyder'; 'vanagon@GERRY.VANAGON.COM'
Subject: RE: O2 Sensor Readout
If things are working correctly, the fine tuning happens automatically.
What you want to do is tamper. A long lead will cause all sorts of
problems as the O2 sensor circuit is low voltage, long wires will pick
up electrical noise and cause erratic operation. Note the green wire
that connects the O2 sensor is actually a shielded cable with one side
of the shield grounded just like a proper audio signal cable is done.
See my last post on the rain problem. Complete disconnection of the
sensor will leave things last state or run-away rich.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Jay L Snyder
Sent: Tuesday, November 12, 2002 10:33 AM
To: vanagon@GERRY.VANAGON.COM
Subject: O2 Sensor Readout
I am thinking about running two wires to the front to a digital
voltmeter from the O2 sensor. If I looped the signal from the sensor to
the front and then back to the ECU, I could interupt the signal to the
ECU from the front with a switch. This way I could monitor the mixture
with and without the O2 sensor on-line (closed and open-loop). Am I
looking at any potential damage to the ECU by shutting the sensor's
input on and off? This would be no different than an O2 sensor heating
up or failing in a normal wiring scheme. I plan to run wire from sensor
(I have an '85 w/single wire) to the voltmeter and also to a switch.
From the switch, run a wire back to the ECU spade connector. Any
problems? Probably only need small gauge wire, maybe 20 AWG? This would
allow me to tune the AFM at real driving conditions.
Jay
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