The ECU (Engine Control Unit) manages the fuel injection and ignition timing based on various sensor inputs to ensure optimal engine performance.

The DFI system includes components such as the ECU, battery, air switching valve, idle speed control valve actuator, intake air pressure sensors, subthrottle valve actuator, intake air temperature sensor, subthrottle sensor, main throttle sensor, fuel injectors, delivery pipe, fuel pump, fuel filter, pressure regulator, crankshaft sensor, water temperature sensor, oxygen sensor (equipped models), gear position switch, and vehicle-down sensor.

The fuel hose should be inspected for any fraying, cracks, or bulges. If any damage is noticed, the hose should be replaced to prevent leaks or bursts.

When servicing the DFI system, use a 12V sealed battery as the power source, do not reverse battery cable connections, avoid disconnecting electrical connections with the ignition on, and prevent short circuits. Always disconnect the battery negative terminal before servicing.

To inspect fuel pressure, connect a fuel pressure gauge between the fuel outlet pipe and delivery pipe, secure the fuel hoses with clamps, start the engine, and measure the fuel pressure while the engine idles. Ensure no fuel leaks during the process.

The recommended idle speed for the DFI system is 1,100 ± 50 r/min (rpm).

If the yellow engine warning indicator light goes on, check the service code displayed on the LCD to diagnose the problem. Perform a pre-diagnosis inspection of the ECU, fuel line, and fuel pressure.

The throttle body assembly should be cleaned, and synchronization inspection and adjustment should be performed regularly. If needed, remove and reinstall the throttle body assembly following the specified procedures.

The vehicle-down sensor detects if the motorcycle is tipped over, and in such cases, it shuts off the fuel pump relay, fuel injectors, and ignition system to prevent fuel spillage and potential fire hazards.

The air cleaner element should be inspected, removed, cleaned, and reinstalled regularly to ensure proper air intake and engine performance.