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Location:
Perth
Registered:
October 2003
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Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 00:57
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I need to hook up my O2 sensor to my Haltech. Being 3 wire, the haltech requires the O2 signal, ground and +13.8 VDC. Now the 3 wires on the O2 sensor are blue, and 2 black. I think it would be safe to say the blue is the signal, identifying the others, i dont know how. Can anyone who has wired one up before steer me in the right direction?
Thanks
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 01:41
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yup, easy as...
the heater will have a resistance of about 4-6ohms usually. there is open circuit from heater to the signal wire.
the two heater wires are usually the same colour as there is polarity to it, it's just a resistance heater.
so, find the two wires with about 5 ohms resistance between them and they are the heater, and the other one is signal. make sure that you have a very good ground from the exhaust to the ECU ground point, as the signals ground is the body of the O2 sensor. if you have a shitty ground, the readings will be incorrect.
fyi, the 4 wire ones i have (both NTK and Bosch) have two white wires for the heater, a grey wire for signal ground, and a black wire for O2 signal.
Cya, Stewart
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Registered:
March 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 04:52
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The heater?
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Location:
Perth
Registered:
October 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 04:57
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Very detailed info oldcorollas, thanks. So the heater and ground will have about 5 ohms resistance each, and it doesnt matter if these wires are connected to the Haltech Ground and +13.8 VDC, any order?
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Registered:
March 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 05:27
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What does the heater have to do with connected the Oxygen Sensor to the ECU? I'm trying to do this at the moment with my MicroTech.
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Location:
Brisbane
Registered:
February 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 07:10
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the heater (inside the sensor) keeps the sensor at a near-constant temp so it reads correctly - turbo engines have wildy fluctuating exhaust gas temps.
also, heater gets the sensor warmed up quickly so the ECU can hop into closed-loop mode once the engine is at normal operating temps.
charles.
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Location:
Perth
Registered:
October 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 07:13
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I thought MicroTech had no closed loop mode?
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Registered:
March 2003
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 07:34
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| Skip wrote on Tue, 18 November 2003 15:57 |
Very detailed info oldcorollas, thanks. So the heater and ground will have about 5 ohms resistance each, and it doesnt matter if these wires are connected to the Haltech Ground and +13.8 VDC, any order?
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no, doesn't matter. the heater is just a resistance heater, so there is no polarity, which is why the wires are same colour 
just confirm the two same coloured wires have the right resistance.
what sensor is it? (like brand or car or whatever) can you pm me what the resistance is?
thanks Chuck, saves me typing 
skip, think you're right, thats what Dale was saying in another thread. don't know whay it wouldn't have closed loop tho, seems to easy to have not put it in the code.
Cya, Stewart
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 07:38
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Danish, how many wires does it have? 3 or 4 is heated. keep in mind that the narrow band sensors will only tell if you are rich or lean of the "stoichiometric" AFR, ie 14.7ish. if it goes lean on the gauge under power, thats bad, but you can still do damage even if it's richer than the switching point of the sensor, but leaner than the motor wants....
Cya, Stewart
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Location:
Brisbane
Registered:
February 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 07:44
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| Quote: |
I thought MicroTech had no closed loop mode?
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would be a bit pointless having an O2 sensor but no closed loop mode? tho very handy as a tuning guide for tuning for cruise.
their website <www.microtechefi.com> doesn't have much in the way of product brochures (tho lots of wiring diagrams) ... but the Haltech, Link, EMS, Motec, etc systems all have closed loop modes.
anyway, looks like you have to find a source of 12V to power the heater (if you're using a 3 or 4 wire sensor) as the LT12 only has one wire (input) for the O2 sensor - the LT8 and LTX8 the same?
charles.
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Location:
Perth
Registered:
October 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 08:15
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oldcorollas: It's the standard 1JZGTE sensor, the motor came out of a Soarer. I will check the resistance tonight and post it up.
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Location:
sydney
Registered:
March 2003
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 09:22
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true, narrow band are only for stoich, which you will only ever want when cruising with buggerall throttle.
i thought that most motors like it a bit rich at idle (or is that just lumpier cams??)
the NTK UEGO's were around $400-500, but the Techedge V2 DIYWB uses the Bosch LSU4 at $150 (from them) even so the controller, display and sensor are around 500-660 and you still have to build the kit...
agreed, the best tuning is done with dyno and 4 gas analyser, but a narrow band O2 is ok for closed loop, no throttle cruising.. well, good enough for most manufacturers..
heh heh, the blinky meters  like a knight-rider scanner
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Location:
Perth
Registered:
October 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 13:02
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My haltech manual says the UEGO sensors dont last very long, correct?
The resistance across the two black wires (heater) was 6.7 ohms, as you would expect connecting across blue to black shows nothing. Problem solved thanks heaps.
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Location:
sydney
Registered:
March 2003
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Re: Haltech - 1JZ Oxygen Sensor
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Tue, 18 November 2003 20:55
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most oxy sensors used for tuning get replaced every yr or few yrs if used regularly
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