Can we tap into the ECM to read the stock wideband AF reading?

For 2004.5 or newer G35/350Z --

Bank 1 A/F sensor
terminal__ECM pin__Idle Voltage
-------------------------------
1________16______3.1V
2________75______2.3V
5________35______2.6V
6________56______2.3V

Bank 2 A/F sensor
terminal__ECM pin__Idle Voltage
-------------------------------
1________76______3.1V
2________77______2.3V
5________57______2.6V
6________58______2.3V

I am seeing about 2.4V on pin 75 at idle, and seems be moving around if I give a little gas. Am I using the correct pin?

 

There is another thread on this (dating back to 2005, but recently revived) here: https://my350z.com/forum/forced-indu...deband-o2.html

Check that out. Long story short, the stock widebands are helpful for idle/cruising tuning, but not accurate for rich AFRs that we deal with when tuning load.

 

Yep the Haltech can use them as inputs, but they match well to my TXS tuner reg only in the range of 13.5 to 15.5. My TXS wideband can drop to 10.5 and the stock widebands will read 13 or high 12s. So I decided not to set up any AFR targets below 13. That pretty much limits your ability for closed loop to vacuum.