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 Post subject: oxy sensor
Posted: Mon Feb 21, 2005 10:31 am 
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Hi everybody. I've got one for you: I was fiddling with my oxy sensor (EL I6)and trying to find out which wire did what. Enyway, I found the 12v wire, (supply to element) and I found what I think was the return wire @ 0.67 volts up to 0.87 but when I tested the other wire, I got a reading of 0.05V. This last wire IMOH should be the earth, thus should have no reading.
Does this mean I have a minor short somewhere, and would it have an effect on the Oxy sensor reading. I tested the actual sensor itself, and had no contiuity between the A and C pins, but had continuity between the B and C pins. I didn't check A and B pins though.


Pins: B C


A



as you look at the plug.

Thorts and comments greatly appreciated
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Posted: Mon Feb 21, 2005 10:32 am 
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Bugger, the "picture" of the plug didn't work. The "A" pin should be directly under the "C" pin
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Posted: Mon Feb 21, 2005 10:53 am 
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Hi Creature.

Im unsure of which wire does which but a 3-wire HEGO should have

2 wires used for the heating element, one being

1 wire for the sensor itself....

As i understand it, the sensor itself is grounded through the exhaust and hence, through the common ground on the engine.

What model we talking here? I thought later falcons were a 4-wire oxygen sensor, with the additional wire providing a specific ground for the sensor.

If you want to test the output, whilst running, the sensor should be switching between 0v - 0.9v when engine is warm and in closed loop.

 

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Posted: Mon Feb 21, 2005 10:58 am 
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I'd imagine that the common ground would be used for the heating element, you wouldnt want to rely on that for the sensor ground :)

 

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Posted: Mon Feb 21, 2005 11:05 am 
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Waggin wrote:
I'd imagine that the common ground would be used for the heating element, you wouldnt want to rely on that for the sensor ground :)


That's what i would have thought but...

http://minimopar.knizefamily.net/ecu/oxygen_se.html

I guess that's the reason they went to the 4-wire.... too much rubbish in the common ground from injectors... narrow band HEGO not an exact science at the best of times, lol.

 

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Posted: Mon Feb 21, 2005 1:34 pm 
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The heater draws 30A so the 0.05V is from the slight resistance in the wires.

 

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Posted: Mon Feb 21, 2005 2:25 pm 
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thanks for all the info. The sensor was running @ 0.1 to 0.87V max when the motor was hot, so I guess that it is working o.k. What SPORK says makes sense to me. I didn't test the ohmage of the wiring tho. I guess the common grd is what is causing the slight resistance too?

It's an 89 EL. I have been using an EF wiring diagram, as my diagram is unavailable at the moment. I think I need to see if the wiring is different.

Once again, thanks
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Posted: Mon Feb 21, 2005 2:58 pm 
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EB-EL 4L all use same HEGO setup, so the wiring should be the same.

 

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