I can't seem to find the answers..

I'm using CM ALDL software, 7730 ecu, AUJP bin. O2 sensor is new.

When idling in closed loop, fully warmed up, target 14.7 AFR, my average O2 sensor reading is 574 mv. Shouldn't the ECM be forcing it to 450mv in closed loop? BLM locked at 128, Int from 125-130, fine fuel 120-135

When running open loop, O2 volts vary from 600 to 850mv. should this be more consistent running open loop?

Is CM software reporting instantaneous or averaged O2 readings?

Thanks
Mike

 

The ecm doesn't try to maintain a perfect 14.7:1 AFR.
It Averages 14.7, and for good reason. In oem form with the Catalytic converters, the AFR must vary slightly rich to lean to generate the heat to keep the chemical reaction going, inside of them. And with the engine running you'll see the O2 toggle over and under stoich..

The ecm code runs in a series of loops, and there is a scratchpad area, where as the processor looks at items, it stores those values. So as the code runs, it all looks at the same values until the next update. This scratchpad area is what the ALDL data stream passes off to the scanner.