MAF sensors require laminar airflow, which occurs when the air flows in parallel layers, with no disruption between the layers. Though the air/fuel ratio with a skewed MAF will be compensated by fuel trim, there is no “adjustment” to the engine load information. If a vehicle’s mass airflow sensor underestimates airflow, the ECM determines that the mixture is too lean and adjusts fuel trim to compensate.Įngine load information-which is used for things like EGR scheduling, shift timing, and spark timing-also comes from the MAF sensor. If the delivered air/fuel ratio is too rich or lean, there will be a fuel trim adjustment applied to the injector duty-cycle. Once the requirements for closed loop operation are achieved, the ECM starts with the base fuel calculation and then monitors the oxygen sensor feedback. The ECM receives the air mass value from the mass airflow sensor and then calculates the required injector pulse width to deliver the amount of fuel needed for the desired air/fuel ratio. In a mass air flow system, the base fuel calculation is very simple. 6.5L Diesel Fuel Injection Pump (2002-94).Manifold Absolute Presure (MAP) Sensors.Air Charge / Manifold Temperature Sensors.Gasoline Direct Injection (GDI) Fuel Injector.
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