O2 pins on ECM (again?)
Thread Starter
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
O2 pins on ECM (again?) Resolution
Which pins on the ECM are for the rear O2's on an LT4? I kind of want to "talk" to the pins and tell them the rear O2's are there and are happy. This may help me get through AZ emissions. Thanks in advance for the help.
I could get out the continuity tester and listen for the beep. I shouldn't be so lazy I guess.
I could get out the continuity tester and listen for the beep. I shouldn't be so lazy I guess.
Last edited by VAHROOM; Jun 5, 2005 at 03:32 PM.
Thread Starter
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
It seems this thread has received so much attention I must post my results. I know the world would stop turning for some if I didn't. haha
The downstream O2's connect to the PCM at pins 3 and 4, and 17 and 18, of the grey connector. The tan and tan/white are the signal lines and the purple and purple/white are the grounds.
I only post this as there may be other's out there that need to install O2 sims due to a lack of rear O2's, and want to place the sim near the PCM.
Hope this helps some one.
The downstream O2's connect to the PCM at pins 3 and 4, and 17 and 18, of the grey connector. The tan and tan/white are the signal lines and the purple and purple/white are the grounds.
I only post this as there may be other's out there that need to install O2 sims due to a lack of rear O2's, and want to place the sim near the PCM.
Hope this helps some one.
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 2
From: Cincinnati Oh
I feel bad that you have posted 4 times in your own thread, so I'll add another post (even if irrelevant). While I could not answer your question, where did you get your O2 sims and how much were they? My "Check Engine Light" is starting to really bother me.
Thread Starter
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
Here is the one that I used.
I found the URL in another post here on the forum. I went to O2 Simulator and bought one of their dual output ones as I have 2 downstream O2's. There is even an activity L.E.D. on it. Installed it right under the PCM, cleared the codes, and rock and roll no more codes.
Took me a little time with my scanner to make sure I had them working right. Soldered the wires in place. Taped up the harness used Velcro® to hold it to the bracket so I could see the L.E.D. and done. Now I need to put a few more miles on it to make sure. I have done a hundred miles or so without any codes.
As far as feeling bad, thanks and there is no need to. I use the forum to help me gain knowledge quickly. When the search tool and posts don't give me what I need, I have a brain, might as well use it. Please feel free to email if you should have issues installing. I will let you know if I run into errors.
Took me a little time with my scanner to make sure I had them working right. Soldered the wires in place. Taped up the harness used Velcro® to hold it to the bracket so I could see the L.E.D. and done. Now I need to put a few more miles on it to make sure. I have done a hundred miles or so without any codes.
As far as feeling bad, thanks and there is no need to. I use the forum to help me gain knowledge quickly. When the search tool and posts don't give me what I need, I have a brain, might as well use it. Please feel free to email if you should have issues installing. I will let you know if I run into errors.
