91integraLSVTEC

hey guys i got a dtc called p0135. I replaced the 02 sensor and im still getting the code. So i disconnected the o2 sensor and started probing wires what i found was I am getting 12v (+) blk/yel wire but the blk/whi (-) wire has no ground. from my understanding the ground is in the pcm so theres probably a break in the wire somewhere. does anybody know where the (-) on the ecu pinout? thanks in advance.


update: Just want to update my thread, this could probably help someone in the future. pcm controls the ground so i determined that pcm was bad and not the o2 sensor. went to the junkyard and installed another auto pcm and problem is now solved. getting 40mpg in my 97 lx sedan now.