Quick oddball question..

[samh_08]

I am still working on my VE table and I was wondering if the side with the stock narrowband should be reading 400-500mv if my wideband is accurate and reading 14.7:1?

Kind of an odd question, but I was curious :grin:.

Sam

[joecar]

Sam, try it and post some logs.

[samh_08]

I checked it out, but it was a short drive and I never logged anything.

What I seen was my wideband AFR at 13.8-14.8 and my narrowband on the opposite bank showing 760-900mv.

Wouldnt I be looking for the narrowband to be around 450mv?

[joecar]

Yes, 450 mV is supposed to the the switch point which is supposed to be AFR 14.7...

But, remember that the PCM trims to stoich by driving rich/lean and looking for the NBO2 voltage to swing inthe same direction, and then the PCM commands the reverse, and it iterates like this...

if you're NBO2 voltage stays steady at 450 mV then that is an indication of NBO2 failure, open circuit, or open loop.

[samh_08]

Well I am in open loop tuning my VE table so should I still see the NBO2 toggle back and forth yet, or stay around 450mV because I am close with the VE table.

If I commanding 14.7 and seeing values very close to this on my wideband than my NBO2 should show around 450mV, correct?

[joecar]

Yes, it should hover around 450mV without switching since it is OL...

I looked thru some of my SD logs but it seems I never logged HO2Sx1 voltages during SD.