Forwarded: Re: Bosch 4&3wire sensor

[Doug Robson]

RABBITT_Andrew at mv8.orbeng.com.au wrote:
> 
> check out the price on a Ford Mondeo HEGO, they're 4-wire jobs.  On
> the three-wire sensors, I'd guess (FWIW) that the heater is grounded
> through the exhaust pipe, the other two wires are a differential
> (floating) signal.  The fourth wire is just a ground for the heater.
> 
> From: (Fred Miranda) fcmtb at ix.netcom.com:smtp
> Date: ## 11/07/96 15:28 ##
> Doug,
> NTK makes low buck 4 wire units.
> Mitsu Eclipses use them.
> 
> Fred
> 
> At 07:19 AM 11/8/96 +1100, you wrote:
> >Hi in a 4 wire O2 sensor you have sensor gnd, earth, heater =ve, and
> >signal
> >in a 3 wire heated is it common ground, and there fore will it upset my
> >autronic SMC if i use the chassis ground effectively for both for this
> >function. if i then conect sensor ground to chassis will this upset
> >things????
> >
> >have plenty of 3 wire ones free, 4 wire ones 350 dollars
> >
> >
> >--
> >|===============================================================|
> >|                      When I die,                             |
> >|         I want to go in my sleep, like my grandfather,       |
> >|          not screaming like the passengers in his car.       |
> >|---------------------------------------------------------------|
> >|      Doug Robson     (H)        mailto:doug at cia.com.au       |
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> >|===

can i ask what you mean by differential signal other then voltage
change??

regards

-- 
|===============================================================|
|			When I die, 				|
|         I want to go in my sleep, like my grandfather, 	|
|          not screaming like the passengers in his car. 	|	
|---------------------------------------------------------------|
|  	Doug Robson     	   mailto:doug at cia.com.au	|
|				mailto:Doug.Robson at chase.com	|
|    Sydney, Australia		 http://www.cia.com.au/doug	|
|---------------------------------------------------------------|
|    Club Car Racing Register of NSW	    |	Thank God	|
|  1992/93 Under 2 litre State Champion	    |	   for		|
| http://www.cia.com.au/doug/ccrrnsw.html   |	Gravity		|
|===============================================================|