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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

O2 Harness

  • Thread starter Thread starter RangerJoe
  • Start date Start date Mar 9, 2011

RangerJoe

I leave the horn on while driving
15 Year Member
Apr 26, 2010
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Mar 9, 2011
#1
  • Mar 9, 2011
  • #1
Well, this build is getting aggravating! Newest problem... Been running down a bad ground problem all week. Found out that Pin 46 in my ECU is fried, which gives me no voltage for a variety of sensors (tps, bap and self test). In the process of chasing this, I fried a second ECU as well. I'm going to take them to a local computer repair shop tomorrow and see if they can repair the circuit.

The culprit?! Previous owner was using an O2 sensor harness for an auto and I am running a 5 sp (A9L). It took a lot of research and searching, but finally found the son of a gun.

So my question is...How do I modify my auto harness to work with my 5sp computer? I have read numerous posts that say it is easy, but no one actually tells how to.

I hope this saves someone a lot of heart ache and time. It all started after I couldn't set my TPS, which uses pin 46 as its ground.

Hopefully someone can answer my question.

Thanks!
 

jrichker

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Mar 9, 2011
#2
  • Mar 9, 2011
  • #2
See http://www.stangnet.com/mustang-forums/749974-computer-issue.html#post7490537 for Joel5.0’s fix for the computer internal signal ground.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
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Mar 9, 2011
#3
  • Mar 9, 2011
  • #3
Set aside some time, and read this through.

Basically, you just need to swap a pin on the harness. Simly a matter of removing the plastic insert and relocating the pin to a different spot. The thread shows reference to this I think

Oxygen sensor Harnesses - Manual/Auto differences and year differences - Ford Mustang Forums : Corral.net Mustang Forum


Quick check, pull the coil wire, unplug the computer and crank the engine. Have a DMM hooked from pin 46 to ground. Should get zero volts. If you get voltage, swap the pin (however i assume you know you need to do this now)
 

RangerJoe

I leave the horn on while driving
15 Year Member
Apr 26, 2010
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Georgia
Mar 9, 2011
#4
  • Mar 9, 2011
  • #4
Thanks guys. Truth be known, I search the forums probably 100 times more than I post. I read alot of the info both of you put out there. It is usually very helpful. Thanks again!
 
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