spo2 repin or not?

bacarruda · May 4, 2022

So the spo2 harness was torn and ruined by the previous owner of my 89... I'm buying a new one that may or may not have to be re pinned and need guidance.
link to new harness: https://lmr.com/item/LRS-8793XSHM/Mustang-O2-Sensor-Harness-Manual-Transmission-87-93

the car has a t-5 manual transmission, 5.0
the ecu in the car is a X3Z as the car has a cobra intake and 24# injectors (not sure what MAF, but it runs just fine), to my understanding this is a 1993 cobra ecu

The harness says to repin for 1989 mustangs, but the ecu is a x3z so would I still repin the harness?

bacarruda · May 4, 2022

edit: the instruction manual has two different directions for repinning, attached below
One for 89-90 and another for 91-93.
The car is an 89 but has a x3z ecu so would I pin for 91-93 or 89-90?
also sorry i mean o2 sensors not spo2, working in medical field confuses me

Mustang5L5 · May 4, 2022

Pin for the engine harness, which seems to be 1989.

Even though the ECU is a later ecu, the ECU pinout remained the same for all 89-93 mustangs. The difference in wiring requiring the o2 harness to be pinned differently was “in the field” so to speak.

As a way to double check, when complete, key on with the ECU removed and check for voltage on pin 47 to ground, and then check when also turning the key to crank.

Mustang5L5 · May 4, 2022

Here’s a thread on repinning and then showing where the pinout should be in the later posts

Electrical - O2 harness repin

This thread is a HOW-TO for the process of repining the o2 sensor harness to match ECU/Trans, in the event the car is swapped. Please do not ask me what the harness should be repined to. The information is out there in an easy google search. Step one. Remove the o2 sensor harness from...

www.stangnet.com

bacarruda · May 4, 2022

Mustang5L5 said:
Pin for the engine harness, which seems to be 1989.

Even though the ECU is a later ecu, the ECU pinout remained the same for all 89-93 mustangs. The difference in wiring requiring the o2 harness to be pinned differently was “in the field” so to speak.

As a way to double check, when complete, key on with the ECU removed and check for voltage on pin 47 to ground, and then check when also turning the key to crank.

Great, thank you!
So you’re saying that pin 47 should light up when complete? Sorry I’m not the best with electrical stuff and cars are fairly new to me still.

As of right now pin 47 is dead with the original harness that is in it and no o2 sensors connected.
The ruined harness in it is ripped where the passenger o2 sensor clips should be

Mustang5L5 · May 4, 2022

Sorry. With a manual ECU if you pin the o2 sensor harness correctly you should read ZERO voltage on pin 47 under any condition. ECU removed.

You might get some phantom voltage like 0.4v. This doesn’t count.

bacarruda · May 4, 2022

Mustang5L5 said:
Sorry. With a manual ECU if you pin the o2 sensor harness correctly you should read ZERO voltage on pin 47 under any condition. ECU removed.

You might get some phantom voltage like 0.4v. This doesn’t count.

Perfect! Thank you so much!

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