For accurate MAF transfer, correct base ______ amounts must be set for idle, part throttle, and wide open throttle.

• A. Fuel
• B. Air
• C. Velocity
• D. Pressure

Answer: (A)

When using a MAF-based fueling approach, fueling is determined from the measured air mass, so you need solid baseline fuel amounts for the main operating regions: idle, part throttle, and wide-open throttle. The MAF sensor tells the ECU the air flow, and the base fuel numbers specify how much fuel to inject for those air masses before any trims or corrections. Getting these base fuel values right gives a correct starting point across idle, light load, and heavy load; the engine can then fine-tune with trims as needed. Air, velocity, or pressure aren’t the quantities you’re setting here—the base amounts are the actual fuel to be injected for a given air flow.