1G o2 sensor wiring confirmation

[Anfurnyy]

Installing a wideband in my 93 1g, went to check out the o2 input on the ECU harness and saw this mess. Doing some research I understand that this has kind of been covered in other forums and that this is actually OEM this way?

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I drew a diagram and just need to know if this is the correct way this is supposed to be? And if so where do the two black wires (grounds?) Go to back inside the harness. Aren't they supposed to go to the sensor grounds on the ecu since they're sensors?

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[AWD-Tony]

This might help you. Start around 37:00. Sensor grounds are 17 & 24 but looks like you’re looking for which sensors they run to? Only way I can think of is to check continuity from each sensor ground back to those wires.

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If you just want to wire in the WB, why not just use an available input?

 

[Anfurnyy]

This might help you. Start around 37:00. Sensor grounds are 17 & 24 but looks like you’re looking for which sensors they run to? Only way I can think of is to check continuity from each sensor ground back to those wires.

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If you just want to wire in the WB, why not just use an available input?

Thanks! I'll check that out. I must have skipped over that part while Watching that video.

I know where to run the input from the WB, I was just making sure that this is the correct wiring for this mess. My plan is just to replace the wire from the NB o2 with my wideband but I didn't want to just swap the wires out if they're incorrect.
Really I was just questioning if this wiring was correct, and where the 2 black wires run back to inside the harness.
Also, all inputs are really being used. With converting to speed density, and using the sensors from the MAF for ethenol content and using the EGR input for my fuel pressure, replacing the NB o2 with WB is pretty much all I can do, at least I think.

 

[AWD-Tony]

Are you having issues? The green looks normal and the red is not compared to my harness

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[Anfurnyy]

Are you having issues? The green looks normal and the red is not compared to my harness

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Okay thanks! The red is a dolphin connector. 2 car used to have an SAFC2 installed an that's how the 2 owners ago wired them.

 

[Vegas Smith]

Thanks! I'll check that out. I must have skipped over that part while Watching that video.

I know where to run the input from the WB, I was just making sure that this is the correct wiring for this mess. My plan is just to replace the wire from the NB o2 with my wideband but I didn't want to just swap the wires out if they're incorrect.
Really I was just questioning if this wiring was correct, and where the 2 black wires run back to inside the harness.
Also, all inputs are really being used. With converting to speed density, and using the sensors from the MAF for ethenol content and using the EGR input for my fuel pressure, replacing the NB o2 with WB is pretty much all I can do, at least I think.

There's no reason to run the fuel pressure input permanently. You set the fuel pressure then forget it. If you feel like you're having fp issues then reconnect it and check. I did the best of both worlds and connected the wideband and fuel pressure to a switch with the middle wire going to EGR. You literally and figuratively switch back between the two when needed with the wideband being the primary use.

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[92AWDHX40]

Im doing this wiring harness as we speak, im doing my 02 sensor and stuff too.

 

[Anfurnyy]

There's no reason to run the fuel pressure input permanently. You set the fuel pressure then forget it. If you feel like you're having fp issues then reconnect it and check. I did the best of both worlds and connected the wideband and fuel pressure to a switch with the middle wire going to EGR. You literally and figuratively switch back between the two when needed with the wideband being the primary use.

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That's not a bad idea. I just wanted to be able to log my fuel pressure for tuning and troubleshooting. I already have the inputs to run both so I figure why not. I'll just set my wideband to simulate narrowband.

 

[Vegas Smith]

Running your wideband as the sole o2 sensor is not equal to having a stock o2 and wideband together. The widebands can be finicky with wiring and could leave you stranded if anything goes wrong, and they might not be as good at controlling fuel trims. Running just the wideband is a convenience, there is nothing to gain.

 

[92AWDHX40]

Best to run both if you can correct nick, thats why i decided to fix myo2 sensor stuff.

 

[Anfurnyy]

Running your wideband as the sole o2 sensor is not equal to having a stock o2 and wideband together. The widebands can be finicky with wiring and could leave you stranded if anything goes wrong, and they might not be as good at controlling fuel trims. Running just the wideband is a convenience, there is nothing to gain.

I don't really see a better solution, IMO. The switch idea isn't a bad idea but then you'd still only be able to log one or the other. Tuning is much easier with being able to log wideband. While I understand that both is best case, it seems that plenty of people run this kind of setup and have no issues.

 

[Vegas Smith]

Fair enough. Have fun staring at your fuel pressure for some reason

 

[Anfurnyy]

Fair enough. Have fun staring at your fuel pressure for some reason

I mean, granted my car wont probably make enough in the near future to use it. But when it comes time to get a little more serious with it, it will be nice to see in the logs that I'm not running out of fuel pressure. I'm not bashing the way you have your setup, its just not a solution for me.

 

[Vegas Smith]

I'll explain it one more time in case this helps anyone else reading: You don't need to log fuel pressure every time you take a log. If there is a problem that you suspect might be fuel pressure-related then you switch over the inputs and verify that fuel pressure is correct...then switch back. I've looked at hundreds of logs and only needed to view fuel pressure on like 1 of them.

 

[92AWDHX40]

I decided to log my fuel pressure it will be getting tuned on a dyno, its a easy enough setup not to,

 

[Anfurnyy]

I'll explain it one more time in case this helps anyone else reading: You don't need to log fuel pressure every time you take a log. If there is a problem that you suspect might be fuel pressure-related then you switch over the inputs and verify that fuel pressure is correct...then switch back. I've looked at hundreds of logs and only needed to view fuel pressure on like 1 of them.

What about voltage parameters set in link? both your sensors use 0-5v? and if not you go switch them in link every time you need to switch and look at fuel pressure? Legit question

 

[Anfurnyy]

I decided to log my fuel pressure it will be getting tuned on a dyno, its a easy enough setup not to,

What have you got for a setup, and which inputs are you using for what?

 

[92AWDHX40]

Its in my build thread but im logging with my egr i tapped into it ran to a factory wire, im doing a ecu wire setup, with new connectors and clean up and relocating stuff. Then i just grounded it im working on it now.

 

[92AWDHX40]

My build thread shows my setup currentlly but i have my harness apart again working on it, over the winter, any questions ask, lots of us can help, here.

 

[Vegas Smith]

What about voltage parameters set in link? both your sensors use 0-5v? and if not you go switch them in link every time you need to switch and look at fuel pressure? Legit question

You change the pin assignment to the input you want, hit save, flip the switch and start logging. Simple as that. Ecmlink does everything else for you. Takes literally 5 seconds.