O2 sensor wiring

[lowboost13]

Does the white wire pin 4 for the o2 sensor input get grounded im talking about the black wire comming out of the two white ones.

 

[19Eclipse90]

Pin 4 on the harness side is a black wire. Whether that is what you are referring to or not, both black wires on the harness side go to ground.

http://www.dsmtuners.com/forums/articles-electrical-wiring/244376-oxygen-sensor-wiring.html

 

[lowboost13]

Pin 4 on the harness side is a black wire. Whether that is what you are referring to or not, both black wires on the harness side go to ground.

http://www.dsmtuners.com/forums/articles-electrical-wiring/244376-oxygen-sensor-wiring.html

I'm talking about pin 4 at the ecu plug its a white wire then connects to a black that I dont know what it goes to. I posted a pic theres that white wire that comes from the big ecu plug then goes into another white wire and a black wire the black wire I am unsure of.

 

[19Eclipse90]

Ah, gotcha. That wire is for the O2 sensor check connector in the passenger side outer kick panel, C-56 here: http://www.dsmtuners.com/forums/articles-electrical-wiring/412841-1990-engine-control-wiring-harness.html. It is an open connection not normally hooked up to anything.

The white wires going into that bundle you have pictured are meant to be the same wire. One end to the O2 sensor and, as you said, one end to the ECU. The bundle is a means of joining those two together from the factory while also tying in the wire for the check connector.

 

[lowboost13]

Ah, gotcha. That wire is for the O2 sensor check connector in the passenger side outer kick panel, C-56 here: http://www.dsmtuners.com/forums/articles-electrical-wiring/412841-1990-engine-control-wiring-harness.html. It is an open connection not normally hooked up to anything.

The white wires going into that bundle you have pictured are meant to be the same wire. One end to the O2 sensor and, as you said, one end to the ECU. The bundle is a means of joining those two together from the factory while also tying in the wire for the check connector.

Ohh ok I see thank you so much!

 

[Blitz_86]

the black wire on the white wires is the shield ground