More precisely, a plot of the voltage output of the O2 sensor vs. richness is roughly an "S" shaped curve with the middle section of the "S" - the place where the fuel/air mixture is in stociometric ratio - being *very* steep. Accordingly, as the fuel/air mixture fluctuates slightly around "perfect" the voltage you see fluctuates wildly. --------------------------------------------------- Tom Young Lafayette, CA 94549 --------------------------------------------------- ----- Original Message ----- From: "Dennis Haynes" <dhaynes@OPTONLINE.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Saturday, April 23, 2005 12:48 PM Subject: Re: O2-senser voltage testing
> It means it is working and doing its job. > > Dennis > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf > Of Leo Lee > Sent: Saturday, April 23, 2005 1:24 PM > To: vanagon@GERRY.VANAGON.COM > Subject: O2-senser voltage testing > > To detect the voltage deliver from the O2 senser to the ECU after engine > warm up, I connected the positive end of a voltmeter to the green wire > coming out of the O2 senser, and negative to the ground. After engine > warmup, I observed the voltage. A higher voltage (0.7- 1.0) indicate a > rich condition, low voltage (0.6 and lower) means leaner condition. I > found that the voltage continue to fluctuate between 0.2 to 0.8. Can > someone please tell me what is this mean? > Leo, 1991 multivan. |
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