MK9R
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| posted on 17/11/09 at 03:09 PM |
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Simple wiring question
0xygen sensors are just a type of resistor, i know which 2 wires carry the power in/from the sensor but do not know which is feed and which is output,
does it matter which one i break into to see the voltage change, i.e. does it have to be the output wire, or does the voltage drop across the entire
circuit??
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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Mr Whippy
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| posted on 17/11/09 at 03:17 PM |
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tbh I thought they generate a current rather than resist one
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Big Stu
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| posted on 17/11/09 at 03:23 PM |
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They generate a voltage up to 1.5 volts I think. with 0.7 being the perfect mixture. They also contain heating coils which should be supplied with
12v.
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MK9R
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| posted on 17/11/09 at 03:26 PM |
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oh yes, of course you are correct, they generate it!! Yes i have identified the heater wires. So if it generates the the voltage, it won't
matter which wire i break into???
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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woolly
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| posted on 17/11/09 at 03:28 PM |
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it can get confusing so have a look here.
http://lambdasensor.com/main/mcolours.htm
woolly
where does it tell you how to do link things please,
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Mr Whippy
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| posted on 17/11/09 at 03:32 PM |
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quote:
Originally posted by MK9R
oh yes, of course you are correct, they generate it!! Yes i have identified the heater wires. So if it generates the the voltage, it won't
matter which wire i break into???
I suspect it would matter as the current flow should still be in one direction rather like a thermocouple, but at this point I’m getting a little out
my depth 
Maybe you could hold it over a gas burner flame and see what the reading is and outputs polarity?
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MK9R
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| posted on 17/11/09 at 03:34 PM |
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quote:
Originally posted by Mr Whippy
quote:
Originally posted by MK9R
oh yes, of course you are correct, they generate it!! Yes i have identified the heater wires. So if it generates the the voltage, it won't
matter which wire i break into???
I suspect it would matter as the current flow should still be in one direction rather like a thermocouple, but at this point I’m getting a little out
my depth
Maybe you could hold it over a gas burner flame and see what the reading is and outputs polarity?
I just have to tap into 1 wire to get the output value for an LPG ECU.
next trick is to find the rpm signal!!! 
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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Mr Whippy
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| posted on 17/11/09 at 03:45 PM |
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not got a wiring diagram for the car? You could follow the wire back from the tacho
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BenB
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| posted on 17/11/09 at 03:50 PM |
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If you're measuring an induced or generated voltage you might need to tap into both- it depends on the circuit at the other end of the cable.
They could have it relative to a virtual earth not true earth....
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MK9R
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| posted on 17/11/09 at 03:51 PM |
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quote:
Originally posted by Mr Whippy
not got a wiring diagram for the car? You could follow the wire back from the tacho
Got a ford TIS electronic manual, its making my head hurt!
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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