AEM X-series wideband reading

[sandman1111]

Hello

i just installed AEM X-series wideband. The readings are around 5. off compared to tunerstudio. The AEM probably reads correct. I had lc-1 previously, and the gauge readings are very similar. Lc-1 and tunerstudio were also off. by 1-1.5.

MS1 get its ground from engine block. 12v comes from fusebox.

Wideband gets its ground from steering column ground. 12v from the same fusebox, but under different fuse.

Questions:
I have connected the analog +, is there a place to connect analog - ?
Should I connect the Wideband 12v inside the MS, where the MS 12v is soldered?
Should I connect the wideband ground inside the MS, where the MS ground is soldered, or solder it to the fusebox, where the MS is soldered?

All help is welcomed.

Thanks

[Rick Finsta]

First thing to try is to ground everything at the same point.

[benckj]

Contrary to the MS and IC2 directions I had to install multiple ground wires (MS & O2 to engine block and O2 gauge to local ground by dash). This was the only way I could reduce the noise in TS. I then selected generic wideband in TS and used my own cal values to the readings between gauge and TS agreed. They were off by around 1%AFR between my gauge which agreed with the Tuners wideband. Tuner also tested values by reducing VE at idle until engine started to miss. This occurs around 15.2AFR. Good cross-reference check before starting to use VEAL.

jim

[sandman1111]

Thanks guys. I managed to fix my problem. I soldered the brown wire (analog -) to MS ground (pin2) , and bow the numbers match. I do have a strange autotune problem, that with very light load it wants to tune afr horribly lean, didn't have that problem with using lc-1. No idea why it wants to do that. Anyway I locked the cells, and everywhere else it changes ve correctly.