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Home >> BMW >> 2012 >> 640i 2D Convertible >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Diagnostic Trouble Codes - 2 Of 2 (N55) >> Fault Code Tests >> DTC P0103, BMW DTC 2778: Mass or Volume Air Flow Sensor 'A' Circuit High >> Fault description

Fault description

The diagnosis monitors the upper limit of the HFM signal's period duration.

Fault monitoring preconditions

The fault is detected whenever the period duration of the HFM signal is greater than 600 us.