The engine control unit adjusts the fuel delivery based on pressure readings from the Subaru Forester MAP Sensor. The Subaru Forester MAP Sensor measures the absolute pressure inside the intake manifold. The MAP Sensor is mounted on the manifold and contains an internal element that converts pressure into an electrical signal which is transmitted to the ECU (engine control unit). The ECU can then work out the density of the air, enabling a precise air-fuel mixture, ignition timing, and drivability. The MAP Sensor of a naturally aspirated Subaru Forester works on the speed-density system, which takes data from the pressure signal and engine speed signal. The MAP Sensor can also work with an intake air temperature input to convert values to air mass. The MAP Sensor indicates the absolute pressure and not relative pressure like boost gauges; therefore, it never shows negative readings. The component in the Subaru Forester powertrain helps transition smoothly when the load changes quickly. The accurate output assists in on-board diagnostics by helping to verify proper exhaust gas recirculation valve function. The component causes the Subaru Forester to maintain a stable idle, respond quickly to acceleration, and burn fuel efficiently under different operating conditions.
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