1.15.6.1 Circuit continuity check

P0100 (HFMEsig), P0102 (HFMEmin), P0103 (HFMEmax) 

To detect a circuit continuity malfunction the period duration of the mass airflow signal is compared with an upper and a lower calibration limit to identify an intermitted contact. A short circuit is identified with a period duration equal to zero.

If the period duration of the mass airflow signal from the MAF sensor equals zero for a calibrated period of time, a short circuit is detected and a HFMEsig fault will be set.

If the period duration of the mass airflow signal from the MAF sensor lies below the lower calibration limit for a calibrated period of time, an intermitted contact (high frequency) is detected and a HFMEmin fault will be set.

If the period duration of the mass airflow signal from the MAF sensor exceeds the upper calibration limit for a calibrated period of time, an intermitted contact (low frequency) is detected and a HFMEmax fault will be set.