Which sensor adjusts the base duty cycle based on intake air temperature?

Which sensor adjusts the base duty cycle based on intake air temperature?

• A. IAT sensor
• B. MAP sensor
• C. MAF sensor
• D. ECT sensor

Answer: (A)

Intake air temperature changes how dense the incoming air is, which directly affects how much fuel is needed to achieve the correct air-fuel ratio. The intake air temperature sensor feeds the engine control unit with the current air temperature, allowing it to adjust the injector baseline pulse width—the base duty cycle—to compensate. Colder air is denser and requires more fuel; warmer air is lighter and needs less fuel. Other sensors like the MAP (manifold pressure), MAF (air mass flow), and ECT (coolant temperature) influence fueling in their own ways, but they don’t adjust the base duty cycle based on intake air temperature as directly as the IAT sensor.

Intake air temperature changes how dense the incoming air is, which directly affects how much fuel is needed to achieve the correct air-fuel ratio. The intake air temperature sensor feeds the engine control unit with the current air temperature, allowing it to adjust the injector baseline pulse width—the base duty cycle—to compensate. Colder air is denser and requires more fuel; warmer air is lighter and needs less fuel. Other sensors like the MAP (manifold pressure), MAF (air mass flow), and ECT (coolant temperature) influence fueling in their own ways, but they don’t adjust the base duty cycle based on intake air temperature as directly as the IAT sensor.