O2 Harness

[RangerJoe]

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]

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

 

[Mustang5L5]

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]

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!