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ECU O2 sensor wire?

 
Old Apr 1, 2010, 04:47 PM
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ECU O2 sensor wire?

Does anyone know which wire on the ECU connector harness is the O2 sensor wire? Need to find out which one it is by this weekend!!
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Old Apr 2, 2010, 07:27 AM
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why not follow it lol
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Old Apr 2, 2010, 09:55 AM
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HAHA youre funny! lol but there are 2 O2 sensors!
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Old Apr 2, 2010, 11:06 AM
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RRE has an Evo X ecu pinout on their website. I wonder if it would be similar to the lancer's.
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Old Apr 2, 2010, 11:54 AM
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Connector B-108 (the bigger 64 pin connector) of the two main ones. Pins 39-38 are for the front O2 sensor, and pins 40-41 for the rear sensor. Pins 39 and 41 being the ECU internal ground.

Just curious why you need to know this?

Last edited by CamShaft; Apr 2, 2010 at 02:10 PM.
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Old Apr 2, 2010, 03:01 PM
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Originally Posted by CamShaft View Post
Connector B-108 (the bigger 64 pin connector) of the two main ones. Pins 39-38 are for the front O2 sensor, and pins 40-41 for the rear sensor. Pins 39 and 41 being the ECU internal ground.

Just curious why you need to know this?
you are a lifesaver!! thanks a lot! so basically pin 38 for the front O2 sensor signal wire? are the pins numbered when looking at the connector with the "clip" side up? and I got a turbo timer that also displays AFR, so I want to hook it up!
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Old Apr 2, 2010, 05:55 PM
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If you look at your ECU the pins from left to right in the top row will be 1-16, and 17-32 next row, ect. So your connector (LOOKING INTO THE FACE OF IT) should be 1-16 from right to left. (ACCORDING TO THE SCHEMATIC.) The signal pin for the from O2 sensor will be 38. This should be a twisted pair wire (RED and Sky Blue), you want the red wire.

Good luck
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Old Apr 2, 2010, 08:44 PM
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dude you are a savior, thank you so much! that was definitely the right wire, turns out these cars run freakin' RICH from the factory! my Apex'i TT reads down to 10.0 AFR (theoretical, narrowband) and has an AFR light that blinks when it is actually below 10, and whenever im accelerating, its at 10.0 and blinking! lol so much for a real econobox, maybe its not after all!
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Old Apr 3, 2010, 12:20 PM
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That is very interesting, weird fuel mapping....but then again you see 2L's out there in other cars not pushing 140HP stock... so I am sure mitsu pumps a little more fuel but took away in other areas to meet EPA requirements but still pump out HP.
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Old Jun 22, 2010, 06:46 PM
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is it possible to not have a wire in the #38 pin, i counted over and over and over.
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Old Jun 23, 2010, 02:49 PM
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you have to be very careful when you count your wires, its easy to get them backwards as far as which wire is 1, and which is 16. this is what happened to me, but then i re-read what CamShaft said, turned my counting around, and got it. try counting again
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Old Apr 8, 2019, 05:01 AM
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Fitting a air fuel gauge

Ive got a lancer 2008 will this be the same for me
02 signal sensor wire
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Old Apr 9, 2019, 10:19 PM
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Far easier to access either O2 sensor wiring in engine bay fuse box on connector A-10.

pin numbers and colors

A-10 (white connector) with wideband wired into rear O2 sensor location
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