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Date:         Tue, 3 Apr 2007 22:13:11 -0500
Reply-To:     Steve Sandlin <vwcarlocks@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Steve Sandlin <vwcarlocks@HOTMAIL.COM>
Subject:      O2 sensor-testing the wires
Comments: To: rubatoguy@COMCAST.NET
Content-Type: text/plain; format=flowed

The sensor DOES ground through the exhaust. The wire does not ground at both ends, as it is an unbalanced shielded cable. If it were to ground at both ends, ground loops could be set up, resulting in ineffective rejection of interfering signals. By grounding only at the ECU end of the cable, all interference is dissipated effectively to ground very near the physical reference to ground for the microprocessor. Believe it or not, too many grounds can often result in more problems than insufficient grounds, and this small-signal application is one of them. To test, unplug from both the ECU and sensor. You should read essentially zero ohms on the center conductor to from sensor to ECU plug, and infinite resistance (>1 Megohm) from center conductor to shield. If any leakage from center to shield, it should be replaced. Steve Sandlin Steve's Lock Shoppe http://www.steveslockshop.com

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