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Registered
Join Date: Nov 2003
Location: Downtown LA CA / North Texas
Posts: 1,175
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ground on a 3 wire O2 sensor ????
Probably a stupid question but am I correct ????
on a 3 wire O2 sensor (wire-1) heater ; (wire-2) signal ; (wire-3) common ground for heater and signal. The reason I ask is does a 3 wire use the exhaust system as the ground for the signal to the DME. If so, is there any ground spot for the exhaust. Thanks again __________________ 1984/85 944na Kalahari Beige (gold) exterior / Black interior Los Angeles / San Diego Lookin for ideas etc... 
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03-23-2004, 08:44 PM
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Registered
Join Date: Aug 2000
Location: North Carolina
Posts: 302
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the one wire is the O2 sig. Block is ground.
The other 2 wires are for the heater only. It doesnt matter which is power or which is ground.
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1988 951 Alpine White / Burgandy Profec B spec II EBC,HomeBrew Chips, WideFire HG, Tial 38mm, Magnecor Wires, Koni Rears, Adj Rear Droplinks, Zeitronix WideBand. |
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03-24-2004, 03:59 AM
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Registered
Join Date: Dec 2002
Location: Richmond, VA
Posts: 484
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A 3-wire sensor uses chassis ground through the exhaust system.
On your car there should be a rectangular two-wire "bullet" connector with one male, and one female "pole" somewhere in the vacinity of the O2 sensor signal connector. This connector is for the heater wires on the sensor.
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Cliff Hipsher '87 944 India Red '86 951 Kalahari Metallic |
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03-24-2004, 05:54 AM
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