o2 sensors not working
11-27-2010, 04:16 PM
#1
TECH Apprentice
Thread Starter
iTrader: (6)
Join Date: Sep 2005
Posts: 398
Likes: 0
Received 0 Likes
on
0 Posts
o2 sensors not working Never worked since i bought the wire harness so we locked the front senors out in the tune. I need to find the problem , is there a way i can test the wires going to the o2 sensor plugs to see if there hooked up right or getting power.
I know you can test the o2 sensors but not sure about from the plug to the pcm i guess
I know you can test the o2 sensors but not sure about from the plug to the pcm i guess
11-28-2010, 09:42 PM
#2
Since you didnt post up Ill assume you're using the common Fbody/early truck black connector HO2s (square or flat)
Each have 4 wires:
Pnk (12v IGN)
Blk (grd)
Tan or tan/wht (low signal)
Ppl or ppl/wht (high signal)
Test the IGN side for 12v with the IGN on. Ground is easy too. Your HO2s will still switch and function to the PCM without the heater wires connected. It will throw a code because the HO2 is not getting up to temp fast enough
The two signal wires are tested by doing a continuity test from the connector to the respective PCM terminals
Newer HO2s have some of the heater element controlled by the PCM. These also get the continuity test to the respective PCM terminals
Each have 4 wires:
Pnk (12v IGN)
Blk (grd)
Tan or tan/wht (low signal)
Ppl or ppl/wht (high signal)
Test the IGN side for 12v with the IGN on. Ground is easy too. Your HO2s will still switch and function to the PCM without the heater wires connected. It will throw a code because the HO2 is not getting up to temp fast enough
The two signal wires are tested by doing a continuity test from the connector to the respective PCM terminals
Newer HO2s have some of the heater element controlled by the PCM. These also get the continuity test to the respective PCM terminals
