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Hey fellas, should start off by saying this is actually a 87 El Camino with a 5.3 ls swap. I haven't had much luck on the gbody forums so I'm posting here.
Been having a check engine light on the Camino for some time now. I should note this isn't the factory check engine light. It's on my Dakota digital dash where it's popping up.
The engine light says both oxygen sensors heater circuits. Now I don't know much about wiring, and I did not build the harness nor install the harness for my car.
The guy that installed it for me is now nowhere to be found and I'm stuck with this annoying light on my dash. I have replaced both sensors but still having same issue. Here's a few pics of the shitty wiring this guy did and a pic of the code it's throwing
The wiring doesn't look all that terrible to me. I've seen FAR worse. (better too, but yeah...) Looks kinda like he just transplanted the whole LM7 harness over, and used some convenient fuse block from some other vehicle that had enough fuses and then pigtailed them to the LM7 harness, which is probably as reasonable and sanitary a method as there is, short of remanufacturing a whole new one ($$$$$$$$$$$$$ comparatively speaking).
Both O2 sensor heater ckts showing a code sounds like a fuse issue. They both run off of fuse O2A in an original LM7. There are 2 pink wires coming from that fuse. It's not impossible that there's a splice involving those, in your 4th pic. Check to see if there's 12V on those, and follow them back toward the fuse block.
When you say follow them to the fuse block, are you talking about the Camino original fuse box under the dash or the little fuse box in my pictures? And do I check the pink wires in my 4th pic?
Since that's part of the new harness, and the 87 didn't have heated sensors (or 2 of them), they should get their power from the new fuse block.
Yes it looks like those pink wires might be spliced to some wire coming off of that fuse block, meaning that inside that tape, there might be a solder joint. See if there's 12V there.
03-24-2020, 03:13 PM
O2 sensor heater circuit problem
