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Old 08-28-2009, 05:15 PM   #1
d.one
 
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Signal wire on Oxygen sensor???

I've been at this for a few months, searching high and low. Does anyone know what wire is for signal on the oxygen sensor? I want to hook up my air/fuel ratio (narrowband) but i can't seem to find anything on what color's the wire.
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Old 08-29-2009, 01:59 PM   #2
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thanks, i'll give it a try
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Old 08-30-2009, 07:32 AM   #3
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You want to use the primary O2 sensor OTW U get false data. Post catalysis O2 readings are meaningless. Personally - I wouldnt tap into this - will screw up ECU. Use scan gauge. This car uses WIDEBAND o2. Call a tuner for more info.
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Old 02-12-2010, 09:20 AM   #4
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hey i got the same problem where can i tap to the signal wire
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Old 02-12-2010, 09:47 AM   #5
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Originally Posted by cruz-gsr View Post
hey i got the same problem where can i tap to the signal wire
The wires comes out of the floor under the carpet, about 6" before the gas pedal and goes into the center of the dash, under the hvac controls.

The Yaris uses a heated sensor, and has the signal floating on an offset voltage. A couple of months ago I pointed someone else to the wires and where to connect them, but his AFR gauge couldn't handle the offset voltage. Most gauges seem to want to be connected to their own sensor and not share the sensor with another device.
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Old 02-12-2010, 12:25 PM   #6
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I've go mine tapped into there, and it seems to work fine...

Cheers
What brand is yours? The one that the other person couldn't get working was a SunPro Sport ST.
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Old 04-25-2013, 11:52 AM   #7
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IŽd found that the front sensor is wideband, with one 12 volts wire, one ground, and two wires with milivolts, the grey has got the higher votage, thats the signal wire for bank 1 sensor 1 ( before the catalist), but after the catalist, and found an rare thin, has got 4 wires, again 2 of them with low voltage, that are the "pump wires", the one with the higher voltage is the signal, but the rest 2 wires, are both 12 volts, no grounds, my is a 2007 yaris. Has anyone found this to??..is the back sensor another wideband one?
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Old 04-25-2013, 12:20 PM   #8
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It is a heated sensor, The 2 wires that are the heater are usually the same color (usually black or grey) - dont tap into these, The other 2 wires are the signal from the sensor back to the ecm which should be blue and white. If you look at the sensor if the first 5 digets are 89465-xxxxx then your vehicle has a oxygen sensor, if its 89467-xxxxx then its equipt with a air fuel ratio sensor. If you have the second part number then you will need to purchase a wide band gauge

Last edited by YarisSedan; 04-25-2013 at 12:36 PM.
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Old 04-25-2013, 12:28 PM   #9
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Rear sensor is not heated pretty sure, and not useful at all for air/fuel.

For the front sensor:

Quote:
I pointed someone else to the wires and where to connect them, but his AFR gauge couldn't handle the offset voltage. Most gauges seem to want to be connected to their own sensor and not share the sensor with another device.
It's best to add a dedicated bung for an air/fuel gauge IF that's what you want and IF you want it to be accurate.
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