Conditions For Setting DTC
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 10 seconds.