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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Tue, 04 October 2005 07:01
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All my previous dealings with ST185 oxy sensors have all seen them only being a single wire type - from memory, most if not all of these were from JDM cars. I'm now playing with an Aus Spec ST185 and have found a 4 wire sensor - is this normal?
Further, what will the implications be (if any) if I choose to run the replacement JDM engine for the car with the Aus Spec Wiring loom, but the JDM ECU - will it all talk to one another, or am I pushing shit uphill with a pointy stick?
Can anyone confirm the "ST185" 4 wire oxygen sensor is the same as the "ST205" oxygen sensor?
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Tue, 04 October 2005 07:13
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virtually all oxygen sensors are the same given the same number of wires. so if an ST205 has a 4 wire, and the ST185 has a 4 wire, their operation will be the same (although wire colours may vary... but easy to work out)
if you want to replace a 4 wire with a 1 wire, thats fine as long as you hook up the single wire to the ECU O2 sense wire.
Cya, Stewart
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Wed, 05 October 2005 04:13
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All GT4's that I have seen have a 4 wire oxy sensor... this includes ST205's and ST185's JDM and Aus spec.
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Location:
Melbourne
Registered:
January 2003
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Wed, 05 October 2005 07:03
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Why would you replace it with a one wire ? is the exhaust system really that good a earth .
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Location:
Sydney
Registered:
September 2004
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Wed, 05 October 2005 07:52
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I believe one of the other wires belongs to the E2 sensor return, and the other 2 are for the O2 sensor heater, as im sure you already know they have a heating coil in built to get them up to operating temp as quickly as possible
Maybe some variants of the motor didnt require heaters due to the region they were sold in, but I too have only seen a 4 wire O2 sensor for the 185.
I would follow oldcorollas if you wanted to try the 1 wire sensor, but im a proponent of replace what was originally in there unless you know your improving it
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Location:
Adelaide
Registered:
May 2005
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Wed, 05 October 2005 13:01
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silverghost is right. there is two wires for the o2 sensor and two for the heater, i believe that there is two separate earths, one for the heater and one for the sensor.
having only one wire going to the sensor would mean that it would be earthing through the exhaust system as per improvedae86
comments.
personaly i too have only seen 4wire, if they use 4 wire here in aus then where the hell would they use 1 wire...... the sahara?? 
the JDM ecu will work with the aus spec loom as many aus spec owners use JDM ecu's for better performance!
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Wed, 05 October 2005 14:23
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I have a single wire on my car.
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I Supported Toymods
Location:
Sydney
Registered:
December 2002
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Thu, 06 October 2005 03:23
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Does it look like a Toyota one or aftermarket Lance?
Assuming it must be an aftermarket jobby as there is only 1 type of oxygen sensor listed in all the 3SGTE manuals I have.
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Location:
Brisbane, Queensland
Registered:
January 2004
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Re: ST185 Oxygen Sensors - 1 Wire or 4 Wire???
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Thu, 06 October 2005 03:42
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| Toobs wrote on Thu, 06 October 2005 13:23 |
Does it look like a Toyota one or aftermarket Lance?
Assuming it must be an aftermarket jobby as there is only 1 type of oxygen sensor listed in all the 3SGTE manuals I have.
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Its a toyota one, im certain of that. No cut wires or anything.
It is an import motor though, thats the only hint i can give as to why its single wire.
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