Installing the X- series AEM Wideband and I noticed some of the wiring is a little different than in the write up.I installed a new pin in terminal 27 for the 0-5v input on the ECM. The new gauge has a 0-5 volt ground wire that needs to be hooked up also. Reading the instructions it looks like they would prefer to have it hooked to the sensor ground or what I think Ford would call the signal return wire in my electrical diagram book. I assume the older AEM widebands are grounded internally to the gauge ground so this was not needed and seemed to work just fine. There is a nice ground point right next to the EEC IV that would be easy to use. Has anyone used one of these new widebands and encountered this?
https://www.aemelectronics.com/files/in ... 0-0300.pdf
AEM x-series Wideband
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fordman428
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decipha
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Re: AEM x-series Wideband
all of them are supposed to be grounded at the ecu but its not that critical