Does this need to be closer to the values used used in the Fast O2 Rich/Lean Threshold vs MAP?

For example, my Fast O2 settings are into the .650 to .750 range. But the default start up voltage is .451 (stock AUJP).

 

Have you ever found an answer? I was wondering same.

On my $6E APYS OEM, the default is set at .566 and Fast O2 into 0.500 to .642 range
On my $8D ATNX OEM, not in idle mode, the default is set at .451 and Fast O2 into 0.522 to .628 range
On my $8D ATNX OEM, in idle mode, the default is set at .451 and Fast O2 is .598

 

No answer yet..

AUJP/ANHT stock calibration also set at .451 default and .522 to .628 for non-idle Fast O2 thresholds

 

A cold O2 sensor reports nothing, the output impedance is too high to to affect anything. The O2 sensor amplifier input is weakly biased to about 450 mV.

Until the O2 sensor is up to temperature it can't produce an output.

The ECM seeing 450 mV won't go into closed loop. The sensor needs to be active and go above and/or below certain value(s) to be 'active.' Only then will the ECM go into closed loop.

RBob.

 

So it's just an arbitrary value for the ECM until the O2 starts generating a usable signal? In which case it has no bearing on closed loop operation?

 

Not arbitrary, need to be sure that the ECM doesn't think that the O2 sensor is active. Otherwise it could go into closed loop with an inactive sensor.

RBob.