Resolved AEM Wideband Sensor Ground Location

[kyler021]

So first off I would like to say my electrical and wiring knowledge is very limited so bear with me. Should I wire the brown wire (analog -) from the AEM gauge to the sensor ground on the ECU (pin 92) kind of like a T for a vacuum line? Where I would connect the brown wire to the existing wire that connects to pin 92? I will include a picture of what I'm talking about. Would it be better to wire that to a chassis ground? I've searched other threads of wiring up a wideband and some don't even mention wiring up a wire to the sensor ground. And apparently, some AEM Gauges don't even come with a wire meant for the sensor ground on the ECU. I've also looked at the ECMLink forum post on how to wire up the Innovate gauge, and they don't mention 'T' ing into pin 92 for sensor ground.

You must be logged in to view this image or video.

Thank you for the help!

Kyle

 

[curt-s]

Closest chassis ground will work. You can verify with a multimeter in continuity mode that it's not just some bolt holding plastic together. Don't use the ECU sensor ground as the gauges & sensor draw significant enough current which risks frying the trace on the ECU board.

 

[kyler021]

Closest chassis ground will work. You can verify with a multimeter in continuity mode that it's not just some bolt holding plastic together. Don't use the ECU sensor ground as the gauges & sensor draw significant enough current which risks frying the trace on the ECU board.

Alright that's perfect, Thank you!

 

[dwb]

I used this page for guidance on my AEM WB install, but had to translate the wire colors for AEM: https://www.ecmtuning.com/wiki/lc1install
Per the document below and according to ECMTuning the brown wire should be connected to the sensor (signal) ground on the ECU.
If you have heat cycle issues, it is recommended (per AEM when I contacted them for help) to connect chassis ground and +12v direct to battery. +12v should be fed via a N/O relay controlled by a switchable +12v source. The later helped mine complete the heat cycle much more regularly.

You must be logged in to view this image or video.

 

[curt-s]

If the gauge has separate grounds for the heater and the signal voltage reference, then you can use the signal ground with the ECU sensor ground to establish a common ground reference point.
If there is only one ground for the gauge, chassis it.