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So after getting to investigate a little further last night, it looks like my redtop's skinny o2 sensor plug has good continuity on the signal wire (white wire on harness side of plug, black wire on sensor side) between the ECU pin 19 and the o2 sensor plug.
It also has good continuity on the ground wire (black wire on harness side of plug, white wire on sensor side) between the chassis and the o2 sensor plug.
However, on the power wire (brown wire on harness side of plug, red wire on sensor side), it wouldn't read any voltage at all with the key turned on. I'm assuming it's supposed to get 12V.
So I cut the brown wire and ran an extension to the fuse box and put it on the fuel pump fuse (right side) just to test how it would act with 12V switched power. Well when I turned the key on, the o2 sensor began getting warm which I bet it wasn't doing before.
I got my Consult cable out to see if ECUtalk would now show something other than 0 voltage for my o2 sensor, but for some reason it suddenly wouldn't connect to my car. OBD Scantech couldn't connect either ("Initial Error"). Tried my friend's laptop and it was the same. Dunno what happened.
Checked for continuity between the dash Consult plug and the ECU plug, and all 3 green wires checked fine (green, green/white, green/black) along with the ground wire.
Maybe my ebay Consult USB cable crapped out on me after about a month of light use? Gonna try to find another 90's Nissan to connect to to see if I can pinpoint whether it's my car or my cable that's suddenly the issue.
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