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Well......it depends.

ECU (Electronic Control Unit) - controls engine by determining the amount of fuel, ignition timing and other parameters, by monitoring an engine through sensors, and reading values from multidimensional maps.

The sensors in question include.

IAC (Idle Air Control)

**MAF (Mass Air Flow) A mass air flow sensor is used to find out the mass of air entering a fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature and altitude, and this is an ideal application for a mass sensor.

**MAP (Manifold Absolute Pressure) one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). The data are used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel metering for optimum combustion.

many more sensors meter and/or control the Fuel injection system.

(**) symbolizes it is a single or combination or the items marked.

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16y ago

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