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1 wire to multi wire oxygen sensor

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teknoboi
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2011/01/21 01:27:01 (permalink)
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1 wire to multi wire oxygen sensor

Hey guys, I've noticed my fuel economy has been crap lately, going from 400+/tank to about 250-300km/tank. Toyota are asking a ridiculous price for the OEM one, so I thought I'd retrofit a 2-3 wire universal oxygen sensor.

My 1990 has a 1 wire oxygen sensor and read that heated(multi wire) sensors would be beneficial for more accurate readings.

Has anyone done this before?
#1

16 Replies Related Threads

    artymr2
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    RE: 1 wire to multi wire oxygen sensor 2011/01/21 01:41:24 (permalink)
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    My understanding is that the multiwire sensors simply have a heating element in them to allow them to work sooner from a cold start. The one wire ones start working after a couple of minutes from a cold start.

    If you get a kit like this:

    http://www.jaycar.com.au/productView.asp?ID=KC5195&keywords=fuel+mixture&form=KEYWORD

    it will show if the ecu is going into the closed loop function.

    I have one lying around if you want to borrow it to check things out.

    It could be something else though. I dont recall fuel economy decreasing that much when i once (inadvertantly) left the oxy sensor disconnected.

    cheers
    #2
    Bionikal
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    RE: 1 wire to multi wire oxygen sensor 2011/01/21 07:31:36 (permalink)
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    I think they o2 sensor doesn't actually do anything after idle anyway.
    #3
    purple5ive
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    RE: 1 wire to multi wire oxygen sensor 2011/01/21 08:45:46 (permalink)
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    i got a replacement 1 wire sensor from bursons -
    heres the part number OX210 its for a 1990 celica gt4 turbo the plug is different so you need to change the plug over thats it
    costs $80 and is a denso part.
    #4
    teknoboi
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    RE: 1 wire to multi wire oxygen sensor 2011/01/21 09:41:44 (permalink)
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    doesn't it operate on cruise? could it be my AFM?
    #5
    purple5ive
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    RE: 1 wire to multi wire oxygen sensor 2011/01/21 10:04:00 (permalink)
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    ecu mostly uses o2 sensor reading/value when car is idling and cruising
    anythign else and the o2 sensor input is ignored usually.
    on our cars the o2 sensors are long past their use by date so probably a good idea to change them anyway.
    another reason can also be a leak in the dump pipe/exhaust near the o2 sensor which will stuff up the sensor reading and the car will use more fuel - this whats happenign to mine atm, and car will also be on low boost most likely and throw an error code for the o2 sensor.

    your afm is also a likely problem as they are getting old and will need to be recalibrated
    #6
    MuMan
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    RE: 1 wire to multi wire oxygen sensor 2011/01/21 11:24:20 (permalink)
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    You can use the sensor without the heater element. Should you want to use the heater and your ECU doesn't support it, you need some way of controlling it. Works in a similar way to the cold start injector.
    #7
    GeoComRacingTeam
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    RE: 1 wire to multi wire oxygen sensor 2011/01/25 12:10:43 (permalink)
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    When I took my exhaust off the other day I forgot to disconnect the O2 sensor conector. The four wires pulled out. It is easy enough to re-attach them but the wires are different colours on each side of the connector. Does anyone know the order?

    Thanks
    Keith
    #8
    MuMan
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    RE: 1 wire to multi wire oxygen sensor 2011/01/26 18:15:21 (permalink)
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    Don't recall the oem colour code, but most Toyota O2's are blue/white/blk/blk or similar.
    Trace the signal wire from the ECU to get the colour code. The others are simply earth return, and heater (not polarised).
    So in this case it would be:
    blue - signal
    white - earth
    black/black - heater.
    #9
    zmit
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    RE: 1 wire to multi wire oxygen sensor 2011/01/30 16:01:07 (permalink)
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    ^^^ correct. going through this right now on my gen2/gen3 electronics.
    #10
    Ray-MR2
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    Re:1 wire to multi wire oxygen sensor 2011/11/10 23:17:09 (permalink)
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    Has anyone ever cleaned an O2 sensor?
    The recomended method is to place it in a jar or similar container, cover it with petrol, screw the lid on, then swirl the petrol round to loosen the deposit build up on the sensor. Leave over night & repeat the process. The lid has to be screwed on to prevent the petrol from evaporating.
    If the sensor is damaged then it must be replaced. No amount of washing in petrol can fix a damaged sensor.
    I would be interested to hear from MR2 owners who have cleaned O2 sensors & have been successful.
    With most SW-20's getting over 15 years old now & 200k Km on them the O2 sensors should have been changed at least once.
    My rule is to change the sensor when you change the spark plugs. Has anyone any other thoughts on this?
     
    #11
    blacky83
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    Re:1 wire to multi wire oxygen sensor 2011/11/11 00:00:32 (permalink)
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    ^^ I'd hope you'd be using platinum plugs if you're replacing an O2 sensor at the same interval.
    Mine currently isn't connected, as I can't actually find where it plugs into the loom. (Thought I'd found it, but was the unused oil level sensor, so I got a warning light every time it warmed up :D) Haven't noticed any real problems with fuel economy. Actually better than my daily, although that ain't saying much.
    #12
    MRTurbo
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    Re:1 wire to multi wire oxygen sensor 2011/11/11 09:35:51 (permalink)
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    I wouldn't bother cleaning the sensor, petrol might do more harm than good to it actually. I'd be doing the sensor every 100,000km for an N/A and 50-80,000 km for a turbo since they run rich. The o2 sensor is only really of any benefit when the ECU is in closed loop mode, and I doubt that happens much in city driving (stop/start).

    1990 SW20 GT 3S-GTE Targa
    2001 Honda CBR600F4i

    #13
    Ray-MR2
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    Re:1 wire to multi wire oxygen sensor 2011/11/12 11:33:56 (permalink)
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    Thanks MR Turbo.
    I mainly do distance driving at or near the speed limit, So the engine soon warms up as do the exhaust gasses. So I guess if there is any unburnt oxygen in the exhaust gas it would be down to poor spark/valve seals/rings/timing & issues with the ECU.
    So many people never change their O2 sensors or even have them connected, yet the fuel economy remains about the same.
    #14
    the_random_hero
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    Re:1 wire to multi wire oxygen sensor 2011/11/12 13:23:53 (permalink)
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    I definitely wouldn't be cleaning it in petrol, something like carby/brake cleaner seems much more logical?
    O2 sensors only really need to be changed when they are no longer functioning correctly, however all the ones I've ever changed were within a few thousand kms of a major service.
    #15
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