Checking components, intake system

HINT: This diagnostic trouble code can be caused by a damaged mass air flow sensor.

Check that lambda adaptations are within the specified normal values.

Incorrect lambda adaptations can indicate a faulty mass air flow (MAF) sensor.

HINT: Use the adaptations for the mass air flow (MAF) sensor and leak flow (parameter read out) to determine how much the system has adapted.

An adaptation on one or both parameters that is less than approximately 0.85 indicates blocked crankcase ventilation and/or a dirty electronic throttle module (ETM).

Adaptations greater than approximately 1.15 indicate a (smaller) air leak somewhere in the intake system.

NOTE:

Even extremely small air leaks can cause this diagnostic trouble code (DTC) to be stored.

Check that the intake air temperature (IAT) sensor and boost pressure sensor are correctly installed. Check for air leakage around the components.

Check the crankcase ventilation for blockage. In particular check the positive crankcase ventilation (PCV) valve on turbocharged engines.

HINT: Indications of a blocked positive crankcase ventilation (PCV) valve include contamination or oil on components in the intake system.

Remedy as necessary.

Other information

Fig 1: Identifying Mass Air Flow (MAF) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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