need help on universal oxygen sensor wiring

[aye87]

hi,
I need some help on wiring of universal o2 sensor, the car is 96 sedan camry LE U.S. model
the main and sub o2 sensor has blue and white wire, and these aftermarket o2 sensor also has blue and white wires, http://www.autozone.com/R,APP233550/...ductDetail.htm

are they just go by blue to blue and white to white, can some one tell me which wire does what? i know one of the wire is to send siganls, thank you

[Kep]

The wiring diagram for a 5SFE shows only a white wire for the main sensor. This would be for the O2 signal. However, newer ones came out with a pre-heater that kept the sensor at the correct temp while the engine was warming up. I am pretty sure that this was supplied with 12 volt power. Did the O2 sensor that you removed have one or two wires?

Kep

[aye87]

Originally Posted by Kep

The wiring diagram for a 5SFE shows only a white wire for the main sensor. This would be for the O2 signal. However, newer ones came out with a pre-heater that kept the sensor at the correct temp while the engine was warming up. I am pretty sure that this was supplied with 12 volt power. Did the O2 sensor that you removed have one or two wires?

Kep

both of the oxygen sensor has two wires which is blue and white, I dont know which by which, i dont wanna mix the wrong leads to the ECU

[aye87]

jusy got the denso universal oxygen sensor, in the manual it say the wire Blue is for (signal) and white is for (ground), it doesn't have the heater wire, the heater wire might apply to 3 or 4 wires oxygen sensor

correct if wrong

[Kep]

I’m not sure. My 1995 5SFE main O2 sensor only has one wire and the 5SFE manual just shows one wire. The 1MZFE manual shows their O2 sensors with heaters but I don’t know how many wires. Someone else may chime in with an answer.

In the meantime, do I understand that your sensor instructions or car manual say blue is for signal and white is for ground? (If it is your car manual, which manual is it? I would like to see if I can find it and make sense of it.)

If no one else helps out, you might want to try tracing it out. Are you saying that you have a corresponding plug in the car with blue and white wires? (Wonder why the 5SFE manual only shows one?) Check the continuity of the white wire at the plug to ground. If it is a ground wire you should have 100% continuity. Use a digital multimeter. They don't screw up electronics as much. If you indeed have ground at the white wire at the plug then, according to your sensor instructions(?), it should be a white to white and blue to blue. However, I have yet to find this in the Toyota manual and can’t vouch for the sensor instructions.

Go cautiously, here there be dragons.

Kep

[aye87]

Originally Posted by Kep

I’m not sure. My 1995 5SFE main O2 sensor only has one wire and the 5SFE manual just shows one wire. The 1MZFE manual shows their O2 sensors with heaters but I don’t know how many wires. Someone else may chime in with an answer.

In the meantime, do I understand that your sensor instructions or car manual say blue is for signal and white is for ground? (If it is your car manual, which manual is it? I would like to see if I can find it and make sense of it.)

If no one else helps out, you might want to try tracing it out. Are you saying that you have a corresponding plug in the car with blue and white wires? (Wonder why the 5SFE manual only shows one?) Check the continuity of the white wire at the plug to ground. If it is a ground wire you should have 100% continuity. Use a digital multimeter. They don't screw up electronics as much. If you indeed have ground at the white wire at the plug then, according to your sensor instructions(?), it should be a white to white and blue to blue. However, I have yet to find this in the Toyota manual and can’t vouch for the sensor instructions.

Go cautiously, here there be dragons.

Kep

the instruction is from the Denso oxygen sensor itself, when I bought the o2 sensor, it came with the instruction, butt connector, 2 piece of heat shink but no connector just plain blue and white wire at the end, in the manual it say connect the corresponding wires

[Kep]

You can get a little more info on the Denso site. Visit <http://www.densoaftermarket.com/catalog/catalog.php?part=o2sn> and drill down to your model. Evidently you bought Denso's "universal" part. They also make an OEM part. You might want to check and see if auto zone might not exchange it for that. I expect the OEM plugs right in. I also noticed that Denso specs out two different part numbers for front and back sensors. Just in case you got the same sensor for both.

Also, I dropped a note to their contact email to review this thread. I don't know how responsive they are to this sort of inquiry but maybe they will check it out and give you a reply.

Kep

[aye87]

I bought two universal, are they same as OE?

[Kep]

Go to the Denso link. It shows two OEM part numbers and two other Universal part numbers. Total of four (presumably) different parts.

Kep

[aye87]

wow, buying online is $30 cheaper than in the auto store.
didn't know Denso have OE sensor, would have buy them instead bought two denso universal one

[Kep]

Here's a photo of my 1995 5SFE O2 sensors plugs:



The sensor at the top (before the cat) uses the top plug and the lower sensor (after the cat) uses the lower plug. Evidently the top sensor is a one wire sensor and the lower sensor is a two wire (blue & white) sensor. The receptical wires for the two wire sensor are red and brown, however.

Kep

[aye87]

mine different than yours, the top sensor and bottom sensor which is before and after the cat both has two wires( blue and white ), both of the sensor located on the header, there no sensor around the cat converter at all
the ones on the header are universal i just put on, the bottom picture is the oem old sensor stock