A/f Gauge install...help!

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01-19-2004, 11:58 PM

Wrxplaya11

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A/f Gauge install...help!

Now, before you get all mad and tell me to search I have, for about 2 hours, and I get diagrams and such about the install but no good explanation for what I am looking for. It was a gift, and I am going to use it. I know it is "useless" to some extent, that is not the purpose of this thread. I have a 2002 WRX. I know that you are supposed to hook the 3rd wire, (not power or ground) to the ecu. I know it is supposed to be hooked up to line B-17. in group "B-135". What i dont know is which one this is. My ecu looks different than any of the diagrams I have seen. Does anyone have a clear picture of which wire this would be? or what port? or anything? Any help is appreciated.

01-21-2004, 02:12 PM

mario

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Join Date: Dec 2002

Location: Flying on the H1 w/ 75 psi of compression on all 4 cyl

Posts: 2,859

Car Info: PnP VF30 w/ STi injectors Perrin intake walbro fuel pump w/ a TXS TBE

Do you know for sure w/ sensor it'll be hooked up to?? Front or rear?? i had mine hooked up to the rear O2 sensor for the longest until i did the cel fix and it works only about half way now

I know the wire to hook up to for the rear O2 sensor if interested

01-21-2004, 10:13 PM

sKOOTeR WRX

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Join Date: Aug 2003

Location: Thousand Oaks, CA, USA

Posts: 75

Car Info: WR Blue WRX

You should hook it up to the front o2 sensor because that is what the ecu uses as the A/F ratio monitor. I am not sure which wire is the signal for the front O2 so here is how to hook it up for b-135 #17

Find the connector with one notch on the top and another notch on the bottom. 10 wires wide in the middle. 3 from the right in the middle.

Look at the image I hope it helps.

-skooter

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