AFR gauge reading for wideband in Tuner Studio
 

My AFR gauge is always pegged to the max. See screenshot below of my 95 idling in the cold.

https://www.miataturbo.net/attachmen...ine=1447527931

Details of my set up.

• I removed the stock narrowband from its bung and put the wideband Bosch in its place
• I have not altered the stock ECU wiring harness
• I chose wideband when I created my project
• In the calibration settings I chose wideband from the drop down
• Neither of the 4 pin IN/OUT connectors are hooked up

The wideband loose wires are soldered to the DB15 wires as follows:

MS 12V -> DB15 PIN 1 -> LC2 red
MS GND -> DB15 PIN 2 -> LC-2 black
MS SIGNAL GND -> DB15 PIN 3 -> Unused
MS O2 -> DB15 PIN 4 -> LC-2 yellow

I'm open to hooking it up differently if that will get it to work.

Did you recalibrate it.
It's under calibrate afr table in tools on the older firmware.
Not sure if that's the issue but you might check.

This is how it's set:
https://www.miataturbo.net/attachmen...ine=1447641382

Anyone else running a working Megasquirt / LC-2 combo through the DB15?

Maybe check the output on the wide band with a volt meter. I believe it 0to5v. At least u could rule out the wideband?
Sorry I use aem and older firmware plus I am still mistifyed by the majic megasquirt black box. Hopefully one of the many experts on here chimes in.

I just tested it while the car was idling (red lead on the multimeter to the yellow wire on the wideband, black lead to ground) and got a constant reading of 0.10v. Do you think my wideband is bad?

The status LED is blinking, which I think is what it's supposed to do.