Question about installing A/F gauge
08-27-2005, 05:02 PM
#1
Question about installing A/F gauge I'm installing my gauges, and got all the wiring ran and pretty much done. I only have 1 wire left that I don't know where it goes. It is the violet wire on my autometer A/F ratio gauge, and it says it is supposed to go to the signal wire that goes from the 02 sensor plug to the computer. Only problem I don't know is which one is that wire? What color is it, and what is the # slot it goes into at the PCM? Should I just put a tap right there at the PCM in the engine bay, or is there a closer place under the knee bolster? Thanks for any help.
08-27-2005, 06:27 PM
#2
You need to tap into the signal wire coming off the front passenger side oxygen sensor. You can tap into it by the sensor or up by the PCM. Trace your oxygen sensor wires up from the sensor. The wire you need to tap into the violet also. On my car, there is a bundle of wires near the PCM that had the wire in it. There were only two violet wires in this bundle. The larger one goes to the starter and the small one is the one you want to tap into.
08-28-2005, 03:10 PM
#5
Okay- went out to install the 1 remaining wire, and found like 5 solid purple wires going into the PCM. And there were a couple more with different colored lines on them... Soooo which of the 5 do I use? The pin# that it plugs into the PCM would be great if anyone knows... TIA
08-28-2005, 03:36 PM
#6
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Chad, if you don't find out, I Will keep diggin for ya, but if you don't find out you can always just follow it from where it plugs into the O2 sensor at, or you can just splice in @ the 02....
08-28-2005, 04:30 PM
#7
Well, I already ran the wire to the PCM & cut it, so I'd really like to just splice it into the PCM there and not have to take apart my interior panels again to re route it... I may just have to jack it up and trace it tomorrow if I can't find out tonight.
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08-28-2005, 05:04 PM
#9
Okay, I just looked and found the loom I think you are reffering to. It runs right by the AIR tube on the p/s. There are 2 purple wires, but they both appear to be the same size. 1 is all purple, and the other has a white stripe on it. Do you happen to know which one it is?
08-28-2005, 07:01 PM
#10
Okay... see if this helps. In the bundle I am talking about, at least on my car, there are 10 wires. Violet large(about 4x larger than the other wires), violet small(the O2 sensor signal wire), pinkish/red, beige, black, black w/ white stripe, brown, blue w/ white stripe, yellow w/ black stripe, and green. This bundle is coming up from under the car running next to the passenger side header. It should have some heat wrap on it. It has the oxygen sensor wires, starter wires, and I think some of the ABS wires. The violet wire I tapped into had no stripe on it. It was a solid violet small wire. You are probably going to have to trace it, although I am willing to guess the solid violet wire on your car is probably the right one. You have to be sure you are tapping into the right one. If you hook the gauge up to a 12v source, it will toast it. The voltage of the signal wire bounces back and forth between 0 and 1volt. If you have a volt meter you can test to see which one is right, but you of course have to strip a little bit of the wire. Your best bet at this point is to trace the wire.
08-28-2005, 07:08 PM
#11
Thanks for all the help. HEre is the pic I took earlier and forgot to post with my last reply:
I am pretty sure this is the wrong bundle of wires according to your last reply. I do think I recall seeing one loom with heat wrap around it tho. I'll check that one for the signal wire you are reffering to.
Thanks again for all your help man
I am pretty sure this is the wrong bundle of wires according to your last reply. I do think I recall seeing one loom with heat wrap around it tho. I'll check that one for the signal wire you are reffering to.
Thanks again for all your help man
08-29-2005, 04:09 AM
#14
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I would never cut into my harness for that. It can mess with your voltage and give inncorrect readings to the pcm. Plus its just a light show. I was just going to tap it but I spent $20 on the casper a/f pigtail because I dont like cutting into my harness. https://ls1tech.com/forums/showpost....66&postcount=2
08-29-2005, 08:17 AM
#15
Thanks for your concern JMBLOWNWS6. That looks like a good tool, but its doing the exact same thing as tapping into the harness- you just get some fancy connections. This wire obviously is a voltage controlled signal wire. And all parallel wires in a circuit have the same voltage. The current will drop, but that does not matter since all the computer senses is the voltage, so I should be okay tapping into the wire. 