Condition for fault identification

Test condition:

The fault is recognized when the indicated air mass does not correlate with the calculated mass airflow rate.

Potential problem source(s):

• Defective HFM, problem with airflow to HFM, clean air tube fallen off intake air noise attenuator
• Leak within induction tract on engine-side of throttle valve (leaks in vicinity of intake air plenum chamber, open oil filler cap)
• Malfunction in components affecting airflow (valve lift monitoring, position of VANOS, throttle valve, pressure sensors....)
• Compressor bypass valve stuck in open position (accompanied by low boost pressure malfunction)
• Severely contaminated air filter

Terminal condition: Terminal 15

Voltage condition:

• Onboard electrical system voltage between 9 V and 16 V

Temperature condition:

• 30°C < intake-air temperature < 120°C
• -30°C < coolant temperature

Time condition:

• None

Other conditions:

• Engine on
• Pressure drop at throttle valve exceeds 18 hPa
• 745hPa < barometric pressure
• 500 RPM < engine speed < 7000 RPM
• 133 RPM < dynamic RPM response (RPM window)
• 7.7% < dynamic load response (load window)