Survey by Qualaroo
+ Reply to Thread
Results 1 to 18 of 18
Like Tree1Likes
  • 1 Post By Xulfiqar

Thread: Want to Install O2 Sensor in 99 Civic

  1. #1
    PakWheeler Follow
    irfan44's Avatar
    Join Date
    Oct 2008
    Location
    Faisalabad
    Posts
    867
    Follows
    1
    Following
    0
    Mentioned
    11 Post(s)
    Tagged
    1 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Exclamation Want to Install O2 Sensor in 99 Civic

    Salam PWs
    As you all must be knowing that until recently the civics in Pakistan were not equipped with O2 sensors. I have a 99 civic and its running too rich. I just want to install an O2 sensor in it so that ECU may be able to control the Air/Fuel ratio at its own.
    I have learned from a fellow PW that Pakistani older civic's dont have o2 sensor but a TRIM POT Setting/ Potentiometer in its driver side kick panel. i found the switch but dont want to fiddle with it.
    the potentiomter provides a constant signal to ECU in lieu of O2 sensor. In this case the ECU has no means of knowing the actual air/fuel ratio.
    BTW the ECU i have is P2C.

    So i want to install an actual O2 sensor on my exhaust mani. Kindly pour in your expert opinion on following:
    1. Can it be done in general by simply removing the potentiometer & hooking up same wiring to O2?
    2. The potentiometer have 3 wire connected to it. but i dont know what type of O2 can be connected to P2C ECU (1wire or 4 wire).
    3. If anyone can do it, plz contact me.

    I will upload the pics of POTENTIOMETER soon.


  2. #2
    PakWheeler Follow
    irfan44's Avatar
    Join Date
    Oct 2008
    Location
    Faisalabad
    Posts
    867
    Follows
    1
    Following
    0
    Mentioned
    11 Post(s)
    Tagged
    1 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    bump....

  3. #3
    PakWheeler Follow
    atif11's Avatar
    Join Date
    May 2006
    Location
    Islamabad
    Age
    28
    Posts
    781
    Follows
    0
    Following
    0
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    Bump for a good question , i want to know the same
    the process i know is very expensive but very effective is installing O2 sensor and "wideband"
    but want to know some cheap solution
    or if i can get a wideband in cheap price
    Dream is not what you see while you sleep , it is what that don't let u sleep .

  4. #4
    Senior PakWheeler Follow
    hash4u's Avatar
    Join Date
    May 2005
    Location
    Islamabad
    Age
    38
    Posts
    24,381
    Follows
    18
    Following
    0
    Mentioned
    406 Post(s)
    Tagged
    13 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    3
    Good Answers
    13

    Default

    got it done many years back in my 98 vti
    it was part of cng lambda (nothing to do with how the car runs on petrol though)
    Life is short and very unpredictable just like a Quarter mile .....

  5. #5
    Senior PakWheeler Follow
    Xulfiqar's Avatar
    Join Date
    Aug 2003
    Location
    Other
    Age
    38
    Posts
    24,405
    Follows
    131
    Following
    0
    Mentioned
    3992 Post(s)
    Tagged
    94 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    0
    Good Answers
    6

    Default

    dont bother - the o2 sensor you would be installng would be sourced from the junkyards anyway - even the brand new ones at new parts markets (khi plaza etc) are sourced from shersha junkyard. The trim pot works - and the whole tuning scene around the world always loves the trim pot rather than the fiddly O2.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

  6. #6
    PakWheeler Follow
    irfan44's Avatar
    Join Date
    Oct 2008
    Location
    Faisalabad
    Posts
    867
    Follows
    1
    Following
    0
    Mentioned
    11 Post(s)
    Tagged
    1 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    fidly or not, my question is how to get it done?
    Will it work or not & will it control the fuel injection.
    If we find it more fidly then efficient then we can always return back to trim pot.

  7. #7
    Senior PakWheeler Follow
    Xulfiqar's Avatar
    Join Date
    Aug 2003
    Location
    Other
    Age
    38
    Posts
    24,405
    Follows
    131
    Following
    0
    Mentioned
    3992 Post(s)
    Tagged
    94 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    0
    Good Answers
    6

    Default

    your ECU will not have the heated O2 function - so for you a two wire sensor would work the output from the pot should be cut and lead to the ECU o2 input and the remaining wire would be sensor ground - green wires in the loom, (do not ground it to the body).

    the O2 sensor/trim pot is only read if the engine coolant temperature sensor signals the ECU to go into closed loop mode - if you are running with no T-stat and direct fan the closed loop temperature is never reached and the ECU stays in cold run rich mode. So for efficiency's sake make sure your engine gets to normal temperature and the automatic fan works.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

  8. #8
    PakWheeler Follow
    irfan44's Avatar
    Join Date
    Oct 2008
    Location
    Faisalabad
    Posts
    867
    Follows
    1
    Following
    0
    Mentioned
    11 Post(s)
    Tagged
    1 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    My trim pot has three wires connected to it as under:
    1. Green/White
    2. Brown
    3. Yellow
    My guess is 1 wire should be signal wire, 2nd should be ref voltage 5v & 3rd must be the ground.
    The problem is which 1 is which. Plz elaborate as per wire colors if u can.
    & 1 more thing. normally O2 sensors produce 0.1 - 0.9v signal. but my guess is that the sensor required to replace this particular trim pot should be of 0-5v signal range as available in universal range. Am i right?

  9. #9
    Senior PakWheeler Follow
    ahsanonline's Avatar
    Join Date
    Jan 2007
    Location
    Rawalpindi
    Age
    86
    Posts
    2,295
    Follows
    3
    Following
    3
    Mentioned
    19 Post(s)
    Tagged
    3 Thread(s)
    Problems Posted
    2
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    Quote Originally Posted by Xulfiqar View Post
    your ECU will not have the heated O2 function - so for you a two wire sensor would work the output from the pot should be cut and lead to the ECU o2 input and the remaining wire would be sensor ground - green wires in the loom, (do not ground it to the body).

    the O2 sensor/trim pot is only read if the engine coolant temperature sensor signals the ECU to go into closed loop mode - if you are running with no T-stat and direct fan the closed loop temperature is never reached and the ECU stays in cold run rich mode. So for efficiency's sake make sure your engine gets to normal temperature and the automatic fan works.
    approx what temp does it have to achieve to get to closed loop mode?
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

  10. #10
    Senior PakWheeler Follow
    Xulfiqar's Avatar
    Join Date
    Aug 2003
    Location
    Other
    Age
    38
    Posts
    24,405
    Follows
    131
    Following
    0
    Mentioned
    3992 Post(s)
    Tagged
    94 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    0
    Good Answers
    6

    Default

    Quote Originally Posted by ahsanonline View Post
    approx what temp does it have to achieve to get to closed loop mode?
    78 degrees celcius at the cylinder head.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

  11. #11
    Senior PakWheeler Follow
    Xulfiqar's Avatar
    Join Date
    Aug 2003
    Location
    Other
    Age
    38
    Posts
    24,405
    Follows
    131
    Following
    0
    Mentioned
    3992 Post(s)
    Tagged
    94 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    0
    Good Answers
    6

    Default

    Quote Originally Posted by irfan44 View Post
    My trim pot has three wires connected to it as under:
    1. Green/White
    2. Brown
    3. Yellow
    My guess is 1 wire should be signal wire, 2nd should be ref voltage 5v & 3rd must be the ground.
    The problem is which 1 is which. Plz elaborate as per wire colors if u can.
    & 1 more thing. normally O2 sensors produce 0.1 - 0.9v signal. but my guess is that the sensor required to replace this particular trim pot should be of 0-5v signal range as available in universal range. Am i right?
    Green/white is the sensor ground
    yellow would be sensor reference and the last is ground. Please verify with multimeter continuity check first. The reference ground is on every sensor you can check its continuity with them.

    yes all japanese Denso/NTK sensors are of this range. You can make work with a proper 4 wire sensor but leave the heater element wires disconnected as it would be mighty difficult to source a 2 wire in Pakistan. This also has an inherent problem of the sensor not getting upto working temperature and hence providing no signal to the ECU.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

  12. #12
    PakWheeler Follow
    irfan44's Avatar
    Join Date
    Oct 2008
    Location
    Faisalabad
    Posts
    867
    Follows
    1
    Following
    0
    Mentioned
    11 Post(s)
    Tagged
    1 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    Here r the pics of TRIM POT under driver side lick panel.
    Want to Install O2 Sensor in 99 Civic - irfan44 albums fuel picture5510 14092011002

    Want to Install O2 Sensor in 99 Civic - irfan44 albums fuel picture5509 14092011001

  13. #13
    PakWheeler Follow
    irfan44's Avatar
    Join Date
    Oct 2008
    Location
    Faisalabad
    Posts
    867
    Follows
    1
    Following
    0
    Mentioned
    11 Post(s)
    Tagged
    1 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    what abt the heater circuit. can we do some direct connections for it or some JUGAAR?

  14. #14
    Senior PakWheeler Follow
    Xulfiqar's Avatar
    Join Date
    Aug 2003
    Location
    Other
    Age
    38
    Posts
    24,405
    Follows
    131
    Following
    0
    Mentioned
    3992 Post(s)
    Tagged
    94 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    0
    Good Answers
    6

    Default

    the heater is wholly controlled by the ECU anytime it senses the O2 sensor is in cold range. no way around it.

    btw - for corolla owners - this pot is in the engine room - now I know people will try to lean out the engine and then we would have some interesting stories to read.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

  15. #15
    Senior PakWheeler Follow
    ahsanonline's Avatar
    Join Date
    Jan 2007
    Location
    Rawalpindi
    Age
    86
    Posts
    2,295
    Follows
    3
    Following
    3
    Mentioned
    19 Post(s)
    Tagged
    3 Thread(s)
    Problems Posted
    2
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    sorry for being a litl off-topic, what can be said about the o2 sensor (single wire type) if its voltage is more or less stuck at 0.4v ?
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

  16. #16
    PakWheeler Follow
    irfan44's Avatar
    Join Date
    Oct 2008
    Location
    Faisalabad
    Posts
    867
    Follows
    1
    Following
    0
    Mentioned
    11 Post(s)
    Tagged
    1 Thread(s)
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0

    Default

    Quote Originally Posted by Xulfiqar View Post
    now I know people will try to lean out the engine and then we would have some interesting stories to read.
    LOLx. yup everybody will do it. btw its our psychee, we fiddle with everything.
    i m also one of them. its the best way to learn but background knowledge is a must.
    wat if we opt for a 1 wire o2 sensor. how it can b incorporated or a 2 wire lambda sensor will be better.

  17. #17
    Senior PakWheeler Follow
    Xulfiqar's Avatar
    Join Date
    Aug 2003
    Location
    Other
    Age
    38
    Posts
    24,405
    Follows
    131
    Following
    0
    Mentioned
    3992 Post(s)
    Tagged
    94 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    0
    Good Answers
    6

    Default

    the 1 wire sensor puts out an oscillating signal which your ECU wont understand.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

  18. #18
    Senior PakWheeler Follow
    Xulfiqar's Avatar
    Join Date
    Aug 2003
    Location
    Other
    Age
    38
    Posts
    24,405
    Follows
    131
    Following
    0
    Mentioned
    3992 Post(s)
    Tagged
    94 Thread(s)
    Problems Posted
    0
    Problems Solved
    4
    Best Answers
    0
    Good Answers
    6

    Default

    Quote Originally Posted by irfan44 View Post
    LOLx. yup everybody will do it. btw its our psychee, we fiddle with everything.
    i m also one of them. its the best way to learn but background knowledge is a must.
    wat if we opt for a 1 wire o2 sensor. how it can b incorporated or a 2 wire lambda sensor will be better.
    fiddling is good only if you first get to know whatever you are fiddling with. Otherwise you dont ride the learning curve, because the first effort for a learning curve is the one where your brain soaks up the most knowledge.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

+ Reply to Thread

User Tag List

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •