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Rear o2 sensor wiring?

Discussion in 'Technical Chat' started by ETaco23, Dec 23, 2009.

  1. Dec 23, 2009 at 10:22 PM
    #1
    ETaco23

    ETaco23 [OP] Marshall offroad Fabrication

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    Im ganna be changing my rear o2 sensor and I got the one with the short wires so I need to cut and splice the new sensor to the exsisting wiring harness.
    I got 2 blacks, 1 white, 1 blue. So I need to know if the blacks need to be to the right one, or does it even matter?
     
  2. Dec 23, 2009 at 10:34 PM
    #2
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
    not sure whats what there. i'd have to look at the wiring.

    maybe you should have got a rear o2 sensor simulator from urd..........only $75.........and its incase the rear sensor or the cat mess up.
     
  3. Dec 23, 2009 at 10:36 PM
    #3
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    getting there....
  4. Dec 23, 2009 at 11:11 PM
    #4
    ETaco23

    ETaco23 [OP] Marshall offroad Fabrication

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    thanks for the advise! I will think about it, but tomarrow Im ganna check out the wiring and see what needs to be done. I sure hope Im able to change it.
     
  5. Dec 24, 2009 at 4:19 AM
    #5
    Janster

    Janster Old & Forgetful

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    My husband and I changed an O2 sensor on our Jeep - where we had to splice wires together. It can be done. Ours was pretty easy, and we didn't have two wires of the same color.

    Can you use the connectors (unplugging them) and somehow follow the wires and match them that way?
     
  6. Dec 24, 2009 at 5:10 AM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    On the truck:

    (1) Red/white = Heater to ECU
    (2) White/red = power
    (3) Red = Oxygen wire to ECU
    (4) Brown = ground

    http://www.ncttora.com/fsm/2003/Wiring_Manual/03tacoma/overalle/overallh.pdf

    The second page of this shows you how to interpret the wire color and wire number (location) in the plug.

    Without knowing the brand and part number of the sensor you purchased, that is all the help I can give you.
     
  7. Dec 24, 2009 at 10:16 AM
    #7
    ETaco23

    ETaco23 [OP] Marshall offroad Fabrication

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    Thanks for the help everyone.... I geuss I will see If I can find the connector and tell which black goes where.
    But I read a diagram of the sensors for Tacomas, and it says that the 2 wires that are the same color are for the same thing, "Heater"
     
  8. Dec 24, 2009 at 10:19 AM
    #8
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    What sensor did you buy?
     
  9. Dec 24, 2009 at 10:33 AM
    #9
    ETaco23

    ETaco23 [OP] Marshall offroad Fabrication

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    A denso
     
  10. Dec 24, 2009 at 10:36 AM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    What part number? I may be able to find some easy instructions to take the guess work out for you.
     
  11. Dec 24, 2009 at 10:39 AM
    #11
    ETaco23

    ETaco23 [OP] Marshall offroad Fabrication

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  12. Dec 24, 2009 at 1:05 PM
    #12
    ETaco23

    ETaco23 [OP] Marshall offroad Fabrication

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    well I just got done cutting and splicing the new o2 sensor in, what a pain in the but! But I think all my connections are good and I cleared the clode, took it for a drive and then checked everything again, all seems good. I used shrink tube on it and taped the wires. So now time will tell if everything is fine now. :)

    I also pulled my front sensor out to look at it, and its perty black. I changed it a couple months ago, and I hope its not bad or ready....

    I also have a Temp Gun, so I checked the Temp of my cats, before and after them, when my truck was at running temp. And it seems to be ok. So I dont think I need new cats. Temp before cat was about 300-350. And After the cat was about 100 degrees hotter. Which is what it should be.
     
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