[MatthewH]

Some more figures (all taken at idle):

Engine Speed => 680 RPM
Cam Adjustment - Intake B1 (act) => -1.0 KW
Cam Adjustment - Intake B2 (act) => -1.0 KW
Phase Position - Bank 1 Intake => -5.0 KW
Phase Position - Bank 2 Intake => -9.0 KW

I couldn't see any exhaust cam related values, only intake.

I then unplugged the MAF sensor, reset the engine controller and took some more readings:

Mass Air Flow => 0.00 g/s
Fuel system 1/2 status => Closed loop, using O2 sensors
Short Term Fuel Trim - Bank 1 => 15.6%
Short Term Fuel Trim - Bank 2 => 10.9%
Long Term Fuel Trim - Bank 1 => 0.0%
Long Term Fuel Trim - Bank 2 => 0.0%

For the first few seconds after starting the engine without the MAF, the short-term fuel trims seemed to be cycling correctly (between -2.0 and +2.0, this also happens with the MAF plugged in) so we know the O2 sensors can read rich conditions. The values then went back to the +10 to +15 range as usual.