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View Full Version : A/F gauge hookup..

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Swifty1638
04-20-2005, 09:05 PM
so, that would really make a difference? i grounded it on the chassis, as i figured the ground is a ground..

-A. Swift
LightningGSX
04-20-2005, 09:09 PM
In this case, ground is also a 0 volt reference for the gauge.And its not uncommon to see a 1/2 volt or so difference in ground potential between different grounding points in a car.The 02 sensor puts out 0-1 volts relative to the ground potential of whereever its grounded at.So if you ground the gauge somewhere with a different ground potential, you'd have to either add or subtract the voltage drop from the gauge reading.When you're dealing with a rather small 0-1v signal, 1/2 v is a huge inaccuracy.
LightningGSX
04-20-2005, 09:12 PM
Ideally, you want to hook it to the same ground the 02 sensor is hooked too, which is right along side the ECU if I remember right
Swifty1638
04-20-2005, 09:38 PM
so, u guys think its the ground, not the power that's hooked wrong?

-A. Swift
LightningGSX
04-20-2005, 09:45 PM
Without out looking at it, my guess is, the ground or the gauge is fucked up.I doubt the power has anything to do with it
LightningGSX
04-20-2005, 09:46 PM
Did you actually drive it? Your car should run rich when first started
Swifty1638
04-20-2005, 10:03 PM
yep, i've been drivin it for a few days now..that light doesnt flicker or move t all...

-A.Swift
LightningGSX
04-21-2005, 03:54 AM
Start by grounding it correctly, at least that will be eliminated as a possible problem.

Second I would verify with a logger or a multimeter that the o2 sensor isn't actually putting out a continuous rich reading.
Swifty1638
04-26-2005, 02:44 PM
Ok. I grounded the A/F gauge to the 106 pin (black with a white stripe), and I also even ran the poewr for it, straight off of the battery. Now, when the car runs, the gauge is off, but when I turn the key off, the gauge turns onto the full rich led (blue) and shuts off with the safc..what's going on? Any other way to run this damn thing?

-A. Swift
Kracka
04-26-2005, 02:54 PM
Its a piece of shit, throw it away. Seriously, there is no point for that gauge on a turbo car other than having some LED's blinking in your face. OK....enough ranting from me....back to being in a good mood.