1.15.6.3 Range check

P00BD (HFMRmax), P00BC (HFMRmin) 

Depending on the engine design the mass airflow must lie within a valid range during all engine conditions.

If the measured mass airflow from the MAF sensor lies below the valid minimum mass airflow for a calibrated period of time, a HFMRmin fault will be set.

If the measured mass airflow from the MAF sensor exceeds the valid maximum mass airflow for a calibrated period of time, a HFMRmax fault will be set.