1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

I need and electrical engineer!!!!!!!!!!!

Discussion in '1st Gen. Tacomas (1995-2004)' started by bwilliamson, Apr 9, 2010.

  1. Apr 9, 2010 at 9:01 PM
    #1
    bwilliamson

    bwilliamson [OP] Well-Known Member

    Joined:
    Mar 11, 2010
    Member:
    #33029
    Messages:
    66
    Gender:
    Male
    First Name:
    Brad
    Magnolia, KY
    I am trying to decipher this wiring diagram for a 02 tacoma. I am trying to understand the a/f sensor circuit. Please tell me if I am reading the right. On the sensor I have 4 wires (1) blue, (1) white, and (2) black. From my research the blue wire is (+) signal, the white is (-) signal (or ground) and the 2 black wires are heater wires. On my diagram of the ecm I have a violet wire, a pink wire, a white wire and a white/red stripe wire. If im understanding this the violet wire feeds the (+) signal wire, the pink feeds the (-) signal wire, the white wire feeds one of the heater wire and the white/read stripe feeds the other. Is this right. Here is the link to the ecm diagram i am looking at: http://www.ncttora.com/fsm/2003/Wiring_Manual/03tacoma/systemci/017ecs5v.pdf
     
  2. Apr 9, 2010 at 9:27 PM
    #2
    bwilliamson

    bwilliamson [OP] Well-Known Member

    Joined:
    Mar 11, 2010
    Member:
    #33029
    Messages:
    66
    Gender:
    Male
    First Name:
    Brad
    Magnolia, KY
    I am thinking about getting some wire and redoing this whole circuit from the EFI main relay all the way down to the sensor. Good idea or not?
     
  3. Apr 11, 2010 at 9:37 AM
    #3
    krlang

    krlang NewEnglander

    Joined:
    Sep 3, 2007
    Member:
    #2592
    Messages:
    133
    Gender:
    Male
    Commonwealth of Massachusetts
    Vehicle:
    03 2WD 2.4L Tacoma Reg Cab
    Chrome Bumpers F&R, Grille & Corner Lights, Wheel Skins, Red/Clear LED taillights, Remote start, PDL, Cruise, K&N, All Kenwood, DNX-5120 6.1" NAV/TRAFFIC/DTV/DVD/XM/BLUETOOTH/USB/IPOD/SUB/rear cam, Tint, Air Band radio, Class 3 Hitch with 4/7 pin harness, Transmission Cooler, Red Top Battery, "Deck Plate" mod.
  4. Apr 11, 2010 at 1:48 PM
    #4
    pittim

    pittim mittip

    Joined:
    May 28, 2008
    Member:
    #6939
    Messages:
    16,520
    Gender:
    Male
    Vehicle:
    Respect your elder gen.
    Pink slider.
    Sounds like you need an electrician, not a EE.
     
  5. Apr 11, 2010 at 3:09 PM
    #5
    bwilliamson

    bwilliamson [OP] Well-Known Member

    Joined:
    Mar 11, 2010
    Member:
    #33029
    Messages:
    66
    Gender:
    Male
    First Name:
    Brad
    Magnolia, KY
    yea i got that about the a-23 but what if i bypassed that connector i.e. cut the wire from the sensor side of the plug and the wire on the ecm side of the plug and just connected them. As long as both the heater wires run through the ecm it should be okay right?
     
  6. Apr 11, 2010 at 3:37 PM
    #6
    bwilliamson

    bwilliamson [OP] Well-Known Member

    Joined:
    Mar 11, 2010
    Member:
    #33029
    Messages:
    66
    Gender:
    Male
    First Name:
    Brad
    Magnolia, KY
    I have an open fault on the heater and its gotta be in the wiring somewhere. I figure that if i splice in a new wire it should help me get rid of my cel light. I read on TacomaNation a guy having the same problem I have (code 1135, changed sensor and cel still on) and spending over $1k and still the cel is on. I bought the sensor from the dealership so I know its okay. The only improvement will be on my eyes not having to stare at the cel everytime i drive.
     
  7. Apr 11, 2010 at 3:45 PM
    #7
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

    Joined:
    Dec 18, 2008
    Member:
    #11714
    Messages:
    49,857
    Gender:
    Male
    First Name:
    Ben
    Beech Creek
    Vehicle:
    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
  8. Apr 11, 2010 at 3:51 PM
    #8
    tiger955

    tiger955 Well-Known Member

    Joined:
    Aug 29, 2009
    Member:
    #21948
    Messages:
    56
    Gender:
    Male
    Carson City
    Vehicle:
    06 Access 4WD
    trd suspension
    This may be a silly question... but did you clear the codes after replacing the sensor?
     
  9. Apr 11, 2010 at 4:09 PM
    #9
    bwilliamson

    bwilliamson [OP] Well-Known Member

    Joined:
    Mar 11, 2010
    Member:
    #33029
    Messages:
    66
    Gender:
    Male
    First Name:
    Brad
    Magnolia, KY
    Lol guys. Cmon give me some credit. Yes I did reset to code after putting the new sensor in.
     
  10. Apr 17, 2010 at 3:21 PM
    #10
    krlang

    krlang NewEnglander

    Joined:
    Sep 3, 2007
    Member:
    #2592
    Messages:
    133
    Gender:
    Male
    Commonwealth of Massachusetts
    Vehicle:
    03 2WD 2.4L Tacoma Reg Cab
    Chrome Bumpers F&R, Grille & Corner Lights, Wheel Skins, Red/Clear LED taillights, Remote start, PDL, Cruise, K&N, All Kenwood, DNX-5120 6.1" NAV/TRAFFIC/DTV/DVD/XM/BLUETOOTH/USB/IPOD/SUB/rear cam, Tint, Air Band radio, Class 3 Hitch with 4/7 pin harness, Transmission Cooler, Red Top Battery, "Deck Plate" mod.
    Any improvement?

    I didnt change my A/F Sensor, but I did my last 02 sensor, is the connector outside on the A/F?

    The 0s sensor was under the seat.
     
  11. Apr 18, 2010 at 1:22 PM
    #11
    bwilliamson

    bwilliamson [OP] Well-Known Member

    Joined:
    Mar 11, 2010
    Member:
    #33029
    Messages:
    66
    Gender:
    Male
    First Name:
    Brad
    Magnolia, KY
    Had the stealership check it when I took my Taco in for undercoating replacement. When I picked it up they informed me that I had a bad ecm. I found one on ebay should have it tuesday. Ill post the results later this week.
     
To Top