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wondering about oxygen sensor wiring


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Fosgate3 
Copper - Posts: 327
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Joined: January 29, 2004
Location: Louisiana, United States
Posted: May 18, 2008 at 7:07 AM / IP Logged  
I have a 2007 Saturn Ion3, 2.2L. I was wondering what the four wires on the o2 sensor are for. There is a Pink/Black that reads 12v, a Tan(or Light Brown)/White that reads ground, a PURPLE / White & BLACK/ White that fluctuate in voltage, neither of which go over 2.5volts. Which one is the actual signal wire from the sensor to the ECU?
Velocity Motors 
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Joined: March 08, 2002
Location: Manitoba, Canada
Posted: May 18, 2008 at 8:06 AM / IP Logged  
Heater circuit Ground Wire
Heater circuit Positive Wire
Sensor circuit Ground wire
Sensor circuit Positive reading wire
These are the wires descriptions of common 4 wire o2 sensors. Hope this will help you in determining what the wires are for with the help of your DMM.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Fosgate3 
Copper - Posts: 327
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Location: Louisiana, United States
Posted: May 18, 2008 at 8:57 PM / IP Logged  

Thanks VM. Given the wiring colors I listed, I would at least guess that...

Pink/Black = Heater circuit positive wire (since it read 12v positive with the engine running)

Tan/White = Heater circuit negative wire (since it read ground with the engine running)

The question remains is which would be the sensor ground and sensor reading wire. Shouldnt the sensor circuit ground wire read as a "ground"? I will double check it to see if it did or not... it will be a toss up between the BLACK/ white and PURPLE / white as to which is ground and which is signal.

chriswallace187 
Gold - Posts: 1,661
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Joined: March 11, 2002
Location: Pennsylvania, United States
Posted: May 19, 2008 at 10:20 PM / IP Logged  
Fosgate3, you might like a Chilton or Haynes guide, or AllDataDIY - the last is about $15/year for a one vehicle subscription, and you get access to complete wiring diagrams for the vehicle, TSBs, mechanical stuff, etc.
C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
reax222 
Copper - Posts: 220
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Joined: March 11, 2006
Location: United States
Posted: August 24, 2008 at 4:20 AM / IP Logged  
What are you trying to accomplish?
The wire that varies from 1-5v is your signal wire.
tilar 
Member - Posts: 3
Member spacespace
Joined: November 07, 2006
Location: United States
Posted: September 28, 2008 at 8:38 AM / IP Logged  

I'd guess he was trying to wire in an EFIE device.

Wiring schematics for that might be something else that could be added to the web site.


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