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Old 04-20-2020, 02:24 AM   #101
JSR84
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Originally Posted by idaeus View Post
Very helpful thread!

anyone know the best place to ground the brown analog ground wire on an x series AEM gauge? Grounding to chassis is making my readings off on my AP3.

AEM Instructions call for a ďsensor groundĒ but itís not clear exactly where this is. Cant find a description of each wire on sensor harness - tried black but it donít work.
Sensor Ground is the grounding point the ECM references ground for all the sensors. It's done like this to ensure the sensors have a common reference to ground and eliminate any potential voltage offset. You can locate the sensor ground wire in the Factory Service Manual.
The pin outs differ from year to year so ensure you have the correct FSM. On my 09 STi the Rear O2 sensor ground was a Yellow and Green wire on ECM connector B135 pin 30. The Rear O2 signal was a white wire, on ECM connector B135 pin 4. If you connect them a few inches down from the connector it saves you from having to punch wire through the firewall.

I originally used the same grounding location as the I had the controller ground but I had an offset between the AP and the gauge reading. Once I switched to sensor ground the offset was gone. I definitely recommend using sensor ground if your wideband's analog output has a ground wire.
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Old 04-21-2020, 01:12 AM   #102
badaily16
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I'm currently doing the wiring in my 06 sti. I have the aem side wiring done and was taking apart my rear o2 sensor wires and noticed the blue and white wires are linked into each other for some reason. Looks like it was from one of the previous owners. Is this a concern or should I go ahead and continue with the install? Any help is appreciated.
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Old 04-21-2020, 11:22 AM   #103
idaeus
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Quote:
Originally Posted by JSR84 View Post
Sensor Ground is the grounding point the ECM references ground for all the sensors. It's done like this to ensure the sensors have a common reference to ground and eliminate any potential voltage offset. You can locate the sensor ground wire in the Factory Service Manual.
The pin outs differ from year to year so ensure you have the correct FSM. On my 09 STi the Rear O2 sensor ground was a Yellow and Green wire on ECM connector B135 pin 30. The Rear O2 signal was a white wire, on ECM connector B135 pin 4. If you connect them a few inches down from the connector it saves you from having to punch wire through the firewall.

I originally used the same grounding location as the I had the controller ground but I had an offset between the AP and the gauge reading. Once I switched to sensor ground the offset was gone. I definitely recommend using sensor ground if your wideband's analog output has a ground wire.
JSR84, Thanks for the additional background on this topic, Iím going to look at to it more using this because I still have not solved the problem.
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Old 04-28-2020, 09:01 PM   #104
Sniperx9119
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Has anyone successfully done this with a 04 wrx? Im pretty sure I have everything wired up correctly but once the sensor gets heated my Voltage on the AP pegs at 1.25V is this something that needs to be changed with ATR?

Last edited by Sniperx9119; 04-29-2020 at 06:42 AM.
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Old 08-13-2020, 09:20 PM   #105
r8888
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does anyone know how to have AFR reading on Acessport instead of Voltage. I've rescaled the parameter on Cobb AT already. I'm confused, don't know what I did wrong.


Thank you.
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Old 09-10-2020, 01:54 PM   #106
splitoris
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Is it worth the extra money to just buy the iwire kit?
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Old 09-10-2020, 03:00 PM   #107
JSR84
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Its pretty easy to do without needing a kit..
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Old 09-10-2020, 03:03 PM   #108
splitoris
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Quote:
Originally Posted by JSR84 View Post
Its pretty easy to do without needing a kit..
Will the Visconti cable help? Going to get new shortblock Iím so whatever is cleanest and easiest. I will be doing tgv and getting flex fuel if that matters?
I also see the spartan kit with sensor for 125 it can get viscount for half off and just get the sensor for 90? Or would I need the uego controller?

Last edited by splitoris; 09-10-2020 at 07:15 PM.
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