O2 sensor wiring help needed.

[yellerandahalf]

Ok, so I'm attempting to wire up a Bosch universal O2 sensor, because my stock one is ruined (the first O2 sensor), and I'm going back to stock management. I wired it up the first time by testing the leads, and it popped the fuse as soon as i turned on the car. What I did to test was hook my test light up to the + terminal on the battery, and test each lead. I found 2 leads that were apparently grounded, and one of them went off after a while. I assumed that this meant the one that stayed on was the true ground and the other was the heater circuit. But apparently not. Can anyone provide a wiring diagram/ some indication of which wire does what? Many thanks. This thing is running MAD rich.
-Mateo

 

[Kansei]

hold on I can go run into the garage and get the diagram that came with the sensor I just bought.

 

[yellerandahalf]

cool, thanks. I have the bosch sensor diagram, i've got a good handle on that.

 

[BBSF2]

heres the pdf for the wiring diagram go to the fifth post and i wrote down what each wire does and what type of sensor we have. hope it helps!
http://www.msprotege.com/forum/showthread.php?p=2273038#post2273038
craig

 

[Kansei]

ok Hmm there's a lot of Ford/Mazda 3&4 wire plugs listed.

The sensor I got is like Wagner brand or something and it is white, two blue, and a black.

Ford/Mazda 3&4-wire:
OE: Heater - white
OE: Heater - white
OE: Signal - black
OE: Ground - gray

I think those wire colors will be the colors on the OEM wiring harness on the old sensor or on the wires on the car's harness on the other side of the plug.

On my new sensor:
heater - black
heater - black
signal - blue
ground - white

If you have different wire colors, you probably will have two that are the same color, and those will be the heater wires. Then, one will be ground and one will be the signal wire.

I hope that helps, I can scan in the pictures but all the diagram shows is the oem plug with the four wires coming out of it and pointing to little charts with the OEM, universal, "type a", and "type b" wire colors.

 

[Kansei]

yeah basically the same info, I guess the Bosche colors are the same as my sensor.

 

[yellerandahalf]

hmm...the bosche colors are grey, black, and two white on mine, but the OEM ones (pre-connector) are all different and striped and such. I don't have the harness from the connector to the first sensor. Ideas?
-Mateo

 

[Kansei]

hmm...the bosche colors are grey, black, and two white on mine, but the OEM ones (pre-connector) are all different and striped and such. I don't have the harness from the connector to the first sensor. Ideas?
-Mateo

is this for the first or second O2 sensor? If the first, I can go down and check to see what pre-connector and post-connector colors match up.

If the second.. well I don't have that part either. It shipped on Thursday or Friday from onlinemazdaparts.

 

[yellerandahalf]

o wow, that would be awesome. It's the first sensor. I would be amazingly grateful.
-Mateo

 

[mazpro]

subscribing. I need to get new sensors and I think I'll be buying the Bosch one.

 

[Kansei]

o wow, that would be awesome. It's the first sensor. I would be amazingly grateful.
-Mateo

agh sorry I just got that message now. I hope someone else can get the info for you.

For anyone who may be able to help:

just look under your hood, and to the right of the block (near the exhaust manifold) and there is a small bracket with two plugs on it. I believe the one on the left is for the first oxygen sensor, which you'll be able to easily trace since the sensor is nearby plugged into the exhaust manifold. The information needed is what color each wire (4 of them total) is before the connector (on the car harness side) and after the connector (on the oxygen sensor side).

I won't be able to check on this for you until 6PM tomorrow, I'm scheduled out from 5am-6pm with no breaks >_<

 

[yellerandahalf]

dude, whenever you can help is good enough by me, I'm just grateful to have someone willing to help in the first place!
In the meantime, if anyone else feels generous and wants to take a look, I'd be very grateful, might even hook you up with some mazda parts at wholesale
-mateo

 

[Kansei]

dude, whenever you can help is good enough by me, I'm just grateful to have someone willing to help in the first place!
In the meantime, if anyone else feels generous and wants to take a look, I'd be very grateful, might even hook you up with some mazda parts at wholesale
-mateo

If you can get wholesale parts, why not just buy the plug harness for the oxygen sensor? I ordered it for like 35 or something from onlinemazdaparts (new vendor on here).

I'm bored in class right now, wish I could just run out to my car and check the colors. I might get a chance if I can get dressed for my interview quickly enough to take a look around 1PM.

 

[yellerandahalf]

i certainly could, but that doesn't tell me how to wire up the new sensor. I still don't know which wire does what. All I really need to do is figure out how to test the leads and know what it means. I have a good idea what the signal wire is, because back when i was dumb I had a narrowband A/F gauge tapped into the harness. I don't know about the others, though. Does anyone know how to properly test the leads and figure out which wire is which? should the heater turn off after a certain amount of time?
-mateo

 

[Kansei]

i certainly could, but that doesn't tell me how to wire up the new sensor. I still don't know which wire does what. All I really need to do is figure out how to test the leads and know what it means. I have a good idea what the signal wire is, because back when i was dumb I had a narrowband A/F gauge tapped into the harness. I don't know about the others, though. Does anyone know how to properly test the leads and figure out which wire is which? should the heater turn off after a certain amount of time?
-mateo

So even on the new harness (the harness that goes from the plug to the oxygen sensor) the wire colors wouldn't be right?

 

[yellerandahalf]

i don't think so (correct me if I'm wrong), but they wouldn't give me any indication of which wires to hook to which on the bosch sensor.
-mateo

 

[Kansei]

I think that is the point of the diagrams that came with my sensor. The directions say to cut the old sensor off of the harness and then match the colors of the harness to the colors on the new sensor based on the chart.

 

[yellerandahalf]

yes indeed. I wish I had the old sensor and harness to go by, then everything would be easy as pie. But, i don't. :----(

 

[Kansei]

yay I'm back, I'll go down into the garage and figure it out for you. With a picture of my plug plus the wires on both sides it should be easy to match it up to the info I posted and someone else linked to earlier in the thread.

 

[Crazee D]

Dude, i had u covered ....

http://www.msprotege.com/forum/showpost.php?p=2419488&postcount=27