It's either your mass flow sensor, the voltage from it (which is also dependent on the voltage to it), or the throttle position.
It measures the mass flow rate at a given throttle angle, and throws a fault if it's outside the range.
I guess you should check that your accelerator cable is correctly adjusted: it should rest against the idle stop at rest, and it rests against the WOT stop when the pedal touches, but doesn't activate, the kickdown switch.

I guess it's also possible that you got another bad MAF sensor.