So bottom line for approaches without vectoring onto final......Correct all altitudes prior to the FAF.
When using non-temp corrected FMS units.....
No VNAV allowed when the airport temp is below what is published on the chart.
VNAV is allowed with no corrections to be made to the FAF altitude or later on the approachif the airport temp is at or above the published temp on the chart.
LNAV is allowed at any temp and must always be temp corrected when the airport temp is in the "standard" range requiring cold altitude corrections.
Is this correct?