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Need help wiring secondary 02 in obd2b car

Discussion in 'HYBRID -> EG-EK / DC' started by dwnthehatch, Mar 29, 2005.

  1. dwnthehatch

    dwnthehatch Member

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    I have read 20+ pages of threads here and cannot come up with an answer.

    I just swapped a 99 b16a2 into a 99 civic dx. I used the b16a2 engine harness and stock B16a2 ecu. All I have left to do is wire up the secondary o2 sensor to the ecu since the wiring for that sensor is in the dash harness of a si. I'm still using the DX dash harness.

    The o2 sensor I have is wired like this:

    BLK WHT

    BLK GRN

    Can anyone tell me where each wire is supposed to go ino the ECU? I saw a few diagrams but I understand what wires go where.

    From what I have read (correct me if I'm wrong), the WHT (SO2S) goes to A8, GRN (SHO2SG) goes to A23. I can not find where the BLK wires go.

    Help please!
     
  2. clanny

    clanny Member

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    IIRC obd2 only uses one O2 sensor. It's only obd0 that uses two. OBD1 and 2 use only the single 4 wire O2 sensor.
     
  3. dwnthehatch

    dwnthehatch Member

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    You are mistaken. The 99 B16A2 is OBD2B and used two o2 sensors. Thanks for the bump.
     
  4. xj0hnx

    xj0hnx I wanna be sedated VIP

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    I'm not real familiar with the OBD IIb, but I would say that the two blacks, one is a ground, and the other is the 12v switched. If they don't have a place on the ECU, than they problably run into a group that ends in the harness.
     
  5. civiclxb16

    civiclxb16 Senior Member

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    hope this helps but the two black wires are grounds for each sensor. also on your wiring harness (the dx harness) the o2 sensor plugs are on the engine harness but on the si harness is on the sub harness is where the o2 sensor goes. so i hope that helps you out i also am working on an obd2 set up!
     
  6. dwnthehatch

    dwnthehatch Member

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    So I just need to ground the black wires to the chassis?
     
  7. civiclxb16

    civiclxb16 Senior Member

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    yeah all i did when i did my boys swap we just put it on the therm housing and it works fine since then
     
  8. xj0hnx

    xj0hnx I wanna be sedated VIP

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    No, not both of them. if you ground them both out, you will burn out the heater circuit.
     
  9. dwnthehatch

    dwnthehatch Member

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    Here's what I have found out:

    [​IMG]

    [​IMG]

    Wht - A23
    Grn - C18
    Blk (O2 heater control) - A8
    Blk (O2 heater supply) - use a switched +12v. Factory has got this off of connector C115 which also supplies power to the EVAP purge solenoid (among other things).

    I'll try it tonight.
     
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