What to Do When the EFI Warning Light on a Motorcycle Comes On?

[DeSkylar]

When the EFI warning light on a motorcycle illuminates, it is necessary to check the fault code table or use diagnostic equipment to read data and identify the cause. Below are specific solutions for addressing the illuminated warning light on a motorcycle: 1. Wiring Issues: Inspect the wiring from the generator's excitation winding terminal through the brushes to the regulator; check the wiring from the generator's stator three-phase winding terminal through the diodes and neutral point to the regulator; also examine the wiring connections for the warning light, switch, regulator, and battery. Verify whether there are grounding issues, open circuits, or unreliable connections in the wiring and terminals. 2. Regulator Malfunction: If a regulator fault is confirmed, first identify the specific issue. Generally, start by checking whether the contacts are burnt, dirty, or not conducting properly, and whether the contact return spring is faulty. The return spring adjusts the voltage level—stretching the spring increases the voltage, while shortening it decreases the voltage. Inspect the regulator coil and connecting wires for open or short circuits. The regulator should be adjusted using specialized equipment.