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What is the issue when the EFI motorcycle's malfunction indicator light stays on?

3 Answers

VanBethany

07/29/25 1:11pm

When the malfunction light is on, it indicates there is a problem with the electronic control system, which is mainly related to the circuitry. Classification of EFI motorcycles: Closed-loop: The function and operation of closed-loop EFI motorcycles are essentially the same as those of cars. Closed-loop EFI motorcycles can adjust the fuel injection volume of the electronic injector based on the oxygen content in the muffler, and they can also change the intake pressure according to variations in external atmospheric pressure. Most domestically produced EFI motorcycles on the market are open-loop. Open-loop: Open-loop EFI motorcycles have been largely phased out due to their inability to meet high environmental standards.

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ValentinaLee

08/14/25 3:03am

When riding my EFI motorcycle, the malfunction indicator light stays on constantly. I've encountered this several times, which usually indicates an issue with the EFI system. For example, the oxygen sensor might be faulty—it monitors exhaust concentration and sends incorrect signals to the ECU if broken. The throttle position sensor could also be loose or aged, affecting fuel injection. If the fuel injector is clogged, uneven fuel injection can cause engine shaking. Loose wiring connections or blown fuses are common reasons too, as they disrupt current flow. Additionally, the ECU control module might malfunction due to unstable voltage or short circuits, leading to misjudgments. Any of these issues can cause the light to stay on. A dedicated diagnostic tool is needed to read the error codes, so it's best to visit a professional shop immediately. Last time I delayed fixing it, I nearly stalled on the road—very dangerous.

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LeviAnn

10/09/25 8:22am

The warning light keeps staying on, which is particularly annoying when I'm riding my motorcycle. You have to be extra careful because it's most likely an issue with the fuel injection system, such as abnormal sensor readings causing the engine to sputter while running, or poor fuel injection resulting in sluggish acceleration. Additionally, aging wiring could lead to short circuits, and breaking down on the road is extremely unsafe. I used to ignore this issue, only to end up spending more on repairs later. Now, whenever I see the light on, I stop to check immediately. I recommend getting it serviced as soon as possible—don't delay.

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