![]() If no values are available in the scan tool, the output voltage of the MAF needs to reach approximately 4V.ĥ. The calculated and measured values should then be compared, and both should correspond. During this drive the parameter list in the scan tool should be checked by a second person. This will provide a maximum pressure boost. To perform an initial, quick check while driving, full throttle should be executed in gear three or four. Symptoms of a faulty MAF sensor to look out for include the ‘ check engine light’ being turned on, reduced fuel economy, difficulty starting the engine, lean idling, black exhaust smoke, unstable engine running, engine power loss and engine misfiring. MAF sensors can degrade in quality over time as well as becoming prone to failure if they get too dirty, which can be caused by exposure to dust, water and oil. What problems can a faulty MAF sensor cause? What are the symptoms of a bad MAF sensor? The MAF sensor is located between the intake manifold and the air filter.ģ. These MAF sensors have no moving parts and use electrical current to measure air mass. The majority of MAF sensors come in two variations: hot-wire technology and hot-film technology. In diesel engines, the MAF sensor serves mainly to control the exhaust gas recirculation ( EGR). ![]() Based on the air mass information, the engine control unit (ECU) is able to balance and deliver the correct fuel quantity to the engine. A MAF sensor determines the mass flow rate of air that enters a fuel-injected internal combustion engine (ICE). ![]() What does ‘MAF’ stand for? What does a MAF sensor do? ![]()
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