[Rich Z]

Just want to post this gem somewhere that I will be able to find it again later.

In SD the PCM determines airmass from the VE table (VE table being speed vs density table)... it then looks up the commanded fuel (B3605, B3647, and B3618 if PE enables) and converts the commanded fuel to AFR (using B3601), and then calculates the fuelmass required by the airmass to meet the commanded fuel AFR.

The PCM computes cylinder airmass from the VE table, and it computes the fuelmass required to maintain the commanded AFR (from B3605, B3547, B3618, converted to AFR by B3601)... the AFR is not richer or leaner, but the fuelmass is the same ratio with the airmass as stated by the commanded AFR... so if the airmass is increased (via increase in VE table) then fuelmass is increased.

i.e. 3 steps:
- PCM computes cylinder airmass from B0101,
- PCM computes commanded AFR by looking up B3605, B3647, B3618 and B3601,
- PCM uses those two to compute cylinder fuelmass.