The MAP Sensor in Subaru Outback vehicles is one of the most crucial in measuring positive air pressure in relation to intake manifold and relaying the scenario to ECU in the aspect of fuel calibration. In fuel-injected engines, the MAP Sensor helps to deduce the air density in the engine and thus the blend or ratio of air and fuel to be used in the combustion process which is an important component of the speed-density method. Naturally aspirated Subaru Outback vehicles require a MAP sensor or a mass airflow sensor but the forced induction engines require both. The MAP Sensor also helps in diagnostic functions that are performed on board, it also helps in the testing of the EGR that is Exhaust Gas Recirculation valve. MAP sensors are also different from boost sensors in that they only measure the absolute pressure and do not read negative pressures which regardless of the existing pressure, will always deliver important measurement data for fuel delivery to the engine, timing of the ignition and other aspects that determine total engine performance.
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