 |
|
|
|
Next: 1997 Civic noise
|
| Author |
Message |
External
Since: Dec 28, 2006
Posts: 13
|
(Msg. 1) Posted: Thu Dec 28, 2006 3:45 pm
Post subject: ID the 4 wires in O2 sensor
Archived from groups: alt>autos>volvo (more info?)
|
|
|
Sorry not Volvo but I know you guys here have great answers. My boy yank the
wires off the O2 sensor connector by accident when he change out the
catalytic converter and looks like the color code doesn't follow through
from O2 unit to the connector to the wire harness.
So from the O2 sensor pigtail I have 4 wires: two blacks, one green and one
white. The two blacks has a reading about 10 ohms across it and the green
and white is open. I assume blacks is the heater with one 12V and the other
at ground - polarity makes on difference, right? So this left the green and
white as sensor, right? Green and white polarity makes no difference, right
also? How many ohms should be measured once I apply some heat to the sensor?
If polarity counts, how could I find out which is what?
Sorry for so many questions and thanks in advance. |
|
| Back to top |
|
 | |
External
Since: Oct 30, 2004
Posts: 1802
|
(Msg. 2) Posted: Thu Dec 28, 2006 9:08 pm
Post subject: Re: ID the 4 wires in O2 sensor [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
"# Fred #" wrote in message
> Sorry not Volvo but I know you guys here have great answers. My boy yank
> the wires off the O2 sensor connector by accident when he change out the
> catalytic converter and looks like the color code doesn't follow through
> from O2 unit to the connector to the wire harness.
>
> So from the O2 sensor pigtail I have 4 wires: two blacks, one green and
> one white. The two blacks has a reading about 10 ohms across it and the
> green and white is open. I assume blacks is the heater with one 12V and
> the other at ground - polarity makes on difference, right? So this left
> the green and white as sensor, right? Green and white polarity makes no
> difference, right also? How many ohms should be measured once I apply some
> heat to the sensor? If polarity counts, how could I find out which is
> what?
>
> Sorry for so many questions and thanks in advance.
>
I'm sure you're right about the black wires, but the polarity is important
on the other two. The output is a DC voltage that varies between about 0.1
and 0.9 volts. My guess is that green is ground (negative) and white is the
signal lead (positive). Maybe the green wire reads low resistance to the
exhaust, or maybe the white one does?
Mike |
|
| Back to top |
|
| |
External
Since: Mar 18, 2004
Posts: 100
|
(Msg. 3) Posted: Fri Dec 29, 2006 3:55 am
Post subject: Re: ID the 4 wires in O2 sensor [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
"# Fred #" wrote in message
> Sorry not Volvo but I know you guys here have great answers. My boy yank
> the wires off the O2 sensor connector by accident when he change out the
> catalytic converter and looks like the color code doesn't follow through
> from O2 unit to the connector to the wire harness.
>
> So from the O2 sensor pigtail I have 4 wires: two blacks, one green and
> one white. The two blacks has a reading about 10 ohms across it and the
> green and white is open. I assume blacks is the heater with one 12V and
> the other at ground - polarity makes on difference, right? So this left
> the green and white as sensor, right? Green and white polarity makes no
> difference, right also? How many ohms should be measured once I apply some
> heat to the sensor? If polarity counts, how could I find out which is
> what?
>
> Sorry for so many questions and thanks in advance.
Blacks - ground.
Green - Heater +12v.
White - Signal +0.1-+0.9v approx.
Tim. >> Stay informed about: ID the 4 wires in O2 sensor |
|
| Back to top |
|
| |
External
Since: Dec 28, 2006
Posts: 13
|
(Msg. 4) Posted: Fri Dec 29, 2006 9:26 am
Post subject: Re: ID the 4 wires in O2 sensor [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
"Tim.." wrote in message
>
> "# Fred #" wrote in message
>
>> Sorry not Volvo but I know you guys here have great answers. My boy yank
>> the wires off the O2 sensor connector by accident when he change out the
>> catalytic converter and looks like the color code doesn't follow through
>> from O2 unit to the connector to the wire harness.
>>
>> So from the O2 sensor pigtail I have 4 wires: two blacks, one green and
>> one white. The two blacks has a reading about 10 ohms across it and the
>> green and white is open. I assume blacks is the heater with one 12V and
>> the other at ground - polarity makes on difference, right? So this left
>> the green and white as sensor, right? Green and white polarity makes no
>> difference, right also? How many ohms should be measured once I apply
>> some heat to the sensor? If polarity counts, how could I find out which
>> is what?
>>
>> Sorry for so many questions and thanks in advance.
>
>
> Blacks - ground.
> Green - Heater +12v.
> White - Signal +0.1-+0.9v approx.
>
> Tim.
>
>
For the connector to the car I found the 12V and one ground but how to
verify which terminal is the +signal?
Also resistance lowers across the green and white terminals as heat is
applied to the sensor, so shouldn't green be signal ground? Forgot to
measure output voltage to verify polarity on the sensor. >> Stay informed about: ID the 4 wires in O2 sensor |
|
| Back to top |
|
| |
External
Since: Dec 17, 2003
Posts: 196
|
(Msg. 5) Posted: Fri Jan 05, 2007 8:28 am
Post subject: Re: ID the 4 wires in O2 sensor [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
# Fred # wrote:
>
> Sorry not Volvo but I know you guys here have great answers. My boy yank the
> wires off the O2 sensor connector by accident when he change out the
> catalytic converter and looks like the color code doesn't follow through
> from O2 unit to the connector to the wire harness.
>
> So from the O2 sensor pigtail I have 4 wires: two blacks, one green and one
> white. The two blacks has a reading about 10 ohms across it and the green
> and white is open. I assume blacks is the heater with one 12V and the other
> at ground - polarity makes on difference, right? So this left the green and
> white as sensor, right? Green and white polarity makes no difference, right
> also? How many ohms should be measured once I apply some heat to the sensor?
> If polarity counts, how could I find out which is what?
>
> Sorry for so many questions and thanks in advance.
According to the instructions for a Bosch universal replacement sensor I
have handy, there are 4 possible OEM wiring colour combos (that this
universal sensor was designed to replace), your combo is "Type C"
signal wire = green
heater wires = black
signal ground = white
--
Mike F.
Thornhill (near Toronto), Ont.
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.) >> Stay informed about: ID the 4 wires in O2 sensor |
|
| Back to top |
|
| |
External
Since: Dec 28, 2006
Posts: 13
|
(Msg. 6) Posted: Fri Jan 05, 2007 8:51 am
Post subject: Re: ID the 4 wires in O2 sensor [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
>
> According to the instructions for a Bosch universal replacement sensor I
> have handy, there are 4 possible OEM wiring colour combos (that this
> universal sensor was designed to replace), your combo is "Type C"
>
> signal wire = green
> heater wires = black
> signal ground = white
>
> --
> Mike F.
> Thornhill (near Toronto), Ont.
>
> Replace tt with t (twice!) and remove parentheses to email me directly.
> (But I check the newsgroup more often than this email address.)
Thanks Mike.
Is there a way to verify on the car connector which is signal +? If no
method is available, I'll reverse the terminals when poor mileage is
observed. >> Stay informed about: ID the 4 wires in O2 sensor |
|
| Back to top |
|
| |
External
Since: Oct 30, 2004
Posts: 1802
|
(Msg. 7) Posted: Sat Jan 06, 2007 6:49 am
Post subject: Re: ID the 4 wires in O2 sensor [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
"# Fred #" wrote in message
> >
>> According to the instructions for a Bosch universal replacement sensor I
>> have handy, there are 4 possible OEM wiring colour combos (that this
>> universal sensor was designed to replace), your combo is "Type C"
>>
>> signal wire = green
>> heater wires = black
>> signal ground = white
>>
>> --
>> Mike F.
>> Thornhill (near Toronto), Ont.
>>
>> Replace tt with t (twice!) and remove parentheses to email me directly.
>> (But I check the newsgroup more often than this email address.)
>
>
> Thanks Mike.
>
> Is there a way to verify on the car connector which is signal +? If no
> method is available, I'll reverse the terminals when poor mileage is
> observed.
>
With the ignition on, the signal wire should have about +0.45 volts DC on it
from the ECU.
Mike >> Stay informed about: ID the 4 wires in O2 sensor |
|
| Back to top |
|
| |
External
Since: Dec 28, 2006
Posts: 13
|
(Msg. 8) Posted: Sat Jan 06, 2007 10:42 am
Post subject: Re: ID the 4 wires in O2 sensor [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
"Michael Pardee" wrote in message
> "# Fred #" wrote in message
>
>> >
>>> According to the instructions for a Bosch universal replacement sensor I
>>> have handy, there are 4 possible OEM wiring colour combos (that this
>>> universal sensor was designed to replace), your combo is "Type C"
>>>
>>> signal wire = green
>>> heater wires = black
>>> signal ground = white
>>>
>>> --
>>> Mike F.
>>> Thornhill (near Toronto), Ont.
>>>
>>> Replace tt with t (twice!) and remove parentheses to email me directly.
>>> (But I check the newsgroup more often than this email address.)
>>
>>
>> Thanks Mike.
>>
>> Is there a way to verify on the car connector which is signal +? If no
>> method is available, I'll reverse the terminals when poor mileage is
>> observed.
>>
>
> With the ignition on, the signal wire should have about +0.45 volts DC on
> it from the ECU.
>
> Mike
>
Thanks. Car is running fine for a week, lucky guess. >> Stay informed about: ID the 4 wires in O2 sensor |
|
| Back to top |
|
| |
| Related Topics: | 940 Crank Sensor - I have a 1994 940 and the crank sensor has broken off the back off the gearbox. What is the purpose of the crank sensor and can it be bypassed? Thanks
Help - RPM Sensor Problems - Hey Guys - I feel like Im cursed with this car. I went to the salvage yard today and got 2 of just about everything. I figure if I dont use it now I can always have it for later and everything was 50% off. I get home and start to change the RPM Sensor an...
RPM sensor problems - can you try to get it out with a magnet or one of those magnets on a telescopic stick?
Who has cheap 740 O2 sensor? - Its for my 92 740 turbo wagon. After changing the air mass meter, the gas mileage went up to normal for a couple of weeks, and then plummeted again. Needs another new part. Rock Auto has a Bosch sensor for $99. But I seem to remember a few months ago..
Knock sensor question--93 850 GLT - My friend just got this car and the Check Engine light is on. The guy he got it from said he'd had the computer scanned and the message was to replace the knock sensor. However, the car isn't knocking, no matter what kind of gas is used. If the.. |
|
You can post new topics in this forum
You can reply to topics in this forum
You can edit your posts in this forum
You can delete your posts in this forum
You can vote in polls in this forum
|
|
|
|
|
|
|
FAQ
Search
Profile
Private Messages
Log in
