Hi all,

I've just installed my MS3PNP, GM IAT and Innovate LC2 Wideband into my naturally aspirated '91 Miata. I'm running into a problem where my wideband gauge (reading 13.5 AFR at idle) is showing a large discrepancy with TunerStudio (reading 10.7 AFR at idle). So far I've...

* Loaded the appropriate Miata basemap from DIYAutoTune
* I've double checked the LC2 manual and followed it's instructions
* Power from keyed ignition under the dash
* Grounds for both the gauge and controller are run to the engine head where the ECU grounds
* In TunerStudio I've configured my AFR to use the `Innovate LC-1 / LC-2 Default`

Reading through the LC2 manual above in the `Wiring` section there are two Analog out wires from the LC2 controller:

* Yellow (which I have connected to my gauge), 0v -> 7.35 AFR, 5v -> 22.39
* Brown (which I ran into my ECU harness), 1.1v-> 14AFR, 0.1v -> 15AFR

I'm wondering now if I should have ran the yellow wire to the ECU harness and the brown to my gauge, even though the wideband manual does not say to do this? I've read various other forums posts on this issue, and the discrepancies are quite small 0.5 AFR, while mine is quite significant. I've also seen the video on using a Custom Linear WB when calibrating, but this feels wrong with such a large difference.

Thanks,
- Matt

 

Reading some more, it looks like I need to program the Analog Output 2 to match the curve of Output 1 and that should resolve my issues.

Just need to hunt down a Windows laptop since Innovate don't build their programmer for OSX.

 

Updated the controller to read:

* 0v -> 7.35
* 5v -> 22.39

On both Analog Outputs, everything matches and runs great!

 

Good job keeping at it and troubleshooting your own work.