Two technicians are diagnosing a poorly running engine with no stored DTCs. When the MAF sensor is unplugged, the engine runs better. Technician A says that this means the MAF is supplying incorrect air flow information to the PCM. Technician B says that this indicates the PCM is defective. Who is right?

Question

Physics

Freeway

29 September, 09:39

Two technicians are diagnosing a poorly running engine with no stored DTCs. When the MAF sensor is unplugged, the engine runs better. Technician A says that this means the MAF is supplying incorrect air flow information to the PCM. Technician B says that this indicates the PCM is defective. Who is right?

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Answers (1)

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Julius Sloan · Answer 1

Technician A

Explanation:

Technician A says that this means the MAF is supplying incorrect air flow information to the PCM

Description

Mass Air Flow sensor (MAF) is one of the major component of an electronic fuel injection system in motor car. It is installed between the air filter and the intake manifold of the engine. Its measures the amount of air entering the engine or the air flow. The sensor uses a burn-off circuit.

Mass Airflow Sensors (MAF) have the responsibility of reporting the amount of air entering the engine to the Powertrain Control Module (PCM)