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NFCooperS · May 10th, 2006, 05:22 AM

Looking for the 02 sensor signal wire... on the ECU side I have red,yellow,black, and black w/green.... on the sensor side I have 2 whites, a gray, and a black. I need to know for sure which is the one....

I would think that the two white ones would be the heater circuit.... which would leave the black and the gray. They line up with the yellow and the black on the ECU side, but opposite. Yellow goes to black and black to gray.

Anyone?

NFCooperS

Al · May 10th, 2006, 06:31 AM

That matches the Hanes pre-cat O2 sensor description pretty closely.

It shows the following for O2 sensor pre-cat wires:

Pin 1 0.5mm squared Yellow wire
Pin 2 0.5mm sq Black wire
Pin 3 1.0mm squared Black/Green wire

I'm going to GUESS the heavier wire (Black/Green) is the heater, but who knows?

Get out a voltmeter and see. You should see a 0.0 Volt to 1.0 Volt signal. (Probably near 0.5 Volt when things are warmed up and running normally.)

NFCooperS · May 10th, 2006, 07:11 AM

I had figured it out thanks.... went to Northamerican motoring and they backed up my guess. The black wire on the sensor/yellow wire on the ECU harness is the high signal path. I wanted to know for sure which one it was so I didn't have to splice/open a wire that I didn't want to. All hooked up and ready to go.

For searching purposes, ignore:

oxygen sensor wiring diagram schematic ecu air/fuel a/f gauge connection

NFCooperS

Al · May 10th, 2006, 03:19 PM

Quote: Originally Posted by NFCooperS

All hooked up and ready to go.

Fantastic.

May 10th, 2006, 05:22 AM	#1
NFCooperS MINI2 Newbie Join Date: Mar 2006 Local Time: 11:35 AM Posts: 21 Offline	O2 sensor signal (High) wire.... which one? Looking for the 02 sensor signal wire... on the ECU side I have red,yellow,black, and black w/green.... on the sensor side I have 2 whites, a gray, and a black. I need to know for sure which is the one.... I would think that the two white ones would be the heater circuit.... which would leave the black and the gray. They line up with the yellow and the black on the ECU side, but opposite. Yellow goes to black and black to gray. Anyone? NFCooperS

May 10th, 2006, 06:31 AM	#2 (permalink)
Al MINI2 Master Join Date: Sep 2003 Local Time: 03:35 PM Posts: 2,292 Offline	That matches the Hanes pre-cat O2 sensor description pretty closely. It shows the following for O2 sensor pre-cat wires: Pin 1 0.5mm squared Yellow wire Pin 2 0.5mm sq Black wire Pin 3 1.0mm squared Black/Green wire I'm going to GUESS the heavier wire (Black/Green) is the heater, but who knows? Get out a voltmeter and see. You should see a 0.0 Volt to 1.0 Volt signal. (Probably near 0.5 Volt when things are warmed up and running normally.)

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May 10th, 2006, 07:11 AM	#3 (permalink)
NFCooperS MINI2 Newbie Join Date: Mar 2006 Local Time: 11:35 AM Posts: 21 Offline	I had figured it out thanks.... went to Northamerican motoring and they backed up my guess. The black wire on the sensor/yellow wire on the ECU harness is the high signal path. I wanted to know for sure which one it was so I didn't have to splice/open a wire that I didn't want to. All hooked up and ready to go. For searching purposes, ignore: oxygen sensor wiring diagram schematic ecu air/fuel a/f gauge connection NFCooperS

May 10th, 2006, 03:19 PM	#4 (permalink)
Al MINI2 Master Join Date: Sep 2003 Local Time: 03:35 PM Posts: 2,292 Offline	Quote: Originally Posted by NFCooperS All hooked up and ready to go. Fantastic.

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