What are the reasons for no high voltage in an EFI motorcycle?
2 Answers
There are several main reasons for an EFI motorcycle having no high voltage, including issues with the spark plug, ignition coil, ECU, ignition switch, kill switch or side stand kill switch, damage to sensors related to the ignition system, or faults such as open circuits, short circuits, and loose connections in the wiring between these components. Classification of EFI motorcycles: 1. Closed-loop type: The functions and roles of closed-loop EFI motorcycles are basically the same as those of cars. Closed-loop EFI motorcycles can adjust the fuel injection quantity based on the oxygen content in the muffler and can also change the intake pressure according to variations in external atmospheric pressure. Most domestically produced motorcycles seen on the market are open-loop EFI motorcycles. 2. Open-loop type: Open-loop EFI motorcycles have been largely phased out due to their inability to meet high environmental standards.
I've been repairing motorcycles for over 20 years and have seen many EFI bikes losing high-voltage ignition. The most common issue is aging or burnt-out ignition coils - when a coil fails, it can't produce sparks, just like a firecracker without sound. Low battery voltage is also critical since the ECU relies on it to command ignition; insufficient power means it stops working. Faulty sensors like the crankshaft position sensor can leave the ECU confused without receiving signals. Broken high-voltage wires or loose connections prevent current transmission, resulting in no high voltage. Stuck relays or blown fuses can also abruptly cut off the current. When facing such problems, don't rush to replace parts - first check the battery charge and fuse condition. Last month, I helped a neighbor fix a case where replacing the coil solved it immediately. Remember, regular wiring inspections can prevent major troubles, and safe riding comes first.
