air fuel gauge
May 25th, 2009, 10:45 PM
#21
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ok. i think i got it. i plan to work on it tomorrow if i get time. my o2 senor has a quick release on it and then it goes to a harness. would it be easier to trace that harness all the way up towards the ecu or tapp into it by the wuick release
May 25th, 2009, 10:51 PM
#22
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Whatever is eaisiest for you , I usually use thin sewing needles to tap for testing , when I am done I wipe some silicone over the area to prevent future corossion. They sell taps for wires at some hardware stores that give you a blade connector to plug a permanate tap into.
They look like this...
They look like this...
Last edited by Mike Sigmond; May 25th, 2009 at 10:55 PM.
May 27th, 2009, 12:38 AM
#25
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Was the purple wire a steady voltage or was it going up & down? What voltage were you getting? I am learning here as we post as well, I just havent had the time to go and probe my wiring on my truck yet. I understand electronics in general & am currently studying car computers.
Its been a fun conversation so far
Its been a fun conversation so far
May 27th, 2009, 4:43 AM
#26
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im thinking you should have a max of 5 volts out of the wire you want.
i havent worked with GMs enough, but my mitsu cars the voltage only fluctuates on the upstreams from 0.00 (lean) to 1.00v (rich). i know the GM truck use a wider range of sensor... ill have to watch the o2 volts on my programmer next drive and see what they are reading. In that diagram on page 2 of this thread you would want to tap the (A25) tan/white wire, which i belive is purple on the GM sensor. your heater wires are generally both white or both black, then theres a grey then purple. purple wire sounds right, check the votls when its up to full temp and running on the purple wire, it should be fluctuating a fairly low voltage.
i havent worked with GMs enough, but my mitsu cars the voltage only fluctuates on the upstreams from 0.00 (lean) to 1.00v (rich). i know the GM truck use a wider range of sensor... ill have to watch the o2 volts on my programmer next drive and see what they are reading. In that diagram on page 2 of this thread you would want to tap the (A25) tan/white wire, which i belive is purple on the GM sensor. your heater wires are generally both white or both black, then theres a grey then purple. purple wire sounds right, check the votls when its up to full temp and running on the purple wire, it should be fluctuating a fairly low voltage.
Last edited by racerx55; May 27th, 2009 at 4:47 AM.
May 27th, 2009, 10:18 AM
#27
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Good point , I figured it might be lower. use a Mv ( milli-volt) setting on your meter if that is the case. A typical low voltage dimmer works on 0-250mv. 250 steps of dimming 1 per mv.
May 27th, 2009, 12:02 PM
#29
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Hmm, sounds like yours runs between 400mv and 500mv. interesting, I need to get my shop software & shop manuals, now I am really curious. there are many other sensors I want to tap and watch.
Thanks for the update
Thanks for the update
Last edited by Mike Sigmond; May 27th, 2009 at 12:05 PM.
May 27th, 2009, 12:06 PM
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ok i just went out to try it again. i followed the wire harness and found that i have 2 i2 sensors. didnt know that. stupid me. they both have these wuick conectors and they have a green, tan, purple and pink wires. now i really dnt know which on to connect to. i think i might call gm and ask them. just for more inputs