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Old 10-24-2005, 01:01 PM   #1
maxpower_454
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Member#: 88963
Join Date: Jun 2005
Vehicle:
2005 WRX
OBP

At the Track Need help with A/F Gauge hookup

I know this should be simple but it's giving me some trouble. First, i have an autometer sportcomp digital a/f gauge. There are three wires, red - 12v ignition, black - good engine ground, and purple - signal wire. I have an 05 WRX. I hooked the red wire to the ignition wire from the clock wires, the ground to the ground on the clock wires, and the purple wire to the #17 on B135, where it's supposed to go according to the ECU pinout pages I found.

The problem is that it is getting power because the green light farthest on the rich side lights up but that's all, no other ones and it doesn't change. (My car is basically stock and I know it cant be running THAT rich.) I tried it without the signal wire too and it did this same thing so that leads me to believe that there is something wrong with the way I hooked up the signal.

All I did was strip a little off of #17 on B135 (The only connector with 10 pins across. I think it was a white wire with a black stripe. It was in the middle row of the connector, third one in from the left.) and splice in the wire with a little bit of solder. (Which probably voided a lot of my warranty right?)

Would this be the correct way to install it? Do I have to program it somehow or anything? If this is all correct, I guess I will just recheck all the wires.
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Old 10-24-2005, 01:44 PM   #2
krees23
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I thought it was best to use a wideband sensor for A/F like the bosch or VW... the narrowband which is what the car uses is basically a yes / no feedback of rich / not rich. I'f I'm wrong on the above I'm sure someone will correct me.
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Old 10-24-2005, 01:52 PM   #3
maxpower_454
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Yes I realize a wideband is better, I'm just asking advice on hooking up a narrowband, not advice on which gauge is better
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Old 10-27-2005, 05:13 PM   #4
Master2192
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98 2.5 RS
04 WRX

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I'm not sure what Pin that is for. You hooked it up to the rear O2 sensor correct? The WRX's front O2 sensor isn't strictly narrow band. It is more like somewhere between wideband and narrow. If you hooked it up to the front O2 sensor then that would cause it to light green only.

Also if you hooked it to the wrong wire that would cause it too, anything that is outputting more than 1v will make it just light green.

I installed my Autometer AFR gauge last weekend, but i didn't have any problems.
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Old 10-28-2005, 09:33 AM   #5
subieworx
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You llikely have the wrong wire. I would direct you to Jorge's site that has the info, but I don't remember what the site address is.
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Old 10-28-2005, 10:09 AM   #6
wrx15psi
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03 wrx
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i dont know if you want to hear this but on the 03 you have to buy a aftermarket 02 sensor to make it work. check the autometer website i dont know if it is the same for the 04 and 05 hope you get it working....
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Old 11-01-2005, 01:23 PM   #7
anthony_delprete84
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i had the same prob. First off DONT SPLICE INTO THE ECU. Splice into the wire underneath ur car by the rear cat. You will see a yellow cover housing 4 wires. I think 2 were black, one was blue, and one is white. Tap into the blue wire, run it up to the car through the firewall, and thats it. It still wont read right bc it is a narrowband gauge, but it will do what its supposed to do. That ECU diagram u are lookin at is WRONG. I tried to do it and there is no #17 on a B135 connector, it is blank. Good luck my man, and by the way this does work, its on my car like this now.
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